{"id":86047,"date":"2024-11-14T13:54:52","date_gmt":"2024-11-14T04:54:52","guid":{"rendered":"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/"},"modified":"2026-07-12T21:25:08","modified_gmt":"2026-07-12T12:25:08","slug":"3q26_microduplication_syndrome","status":"publish","type":"post","link":"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en","title":{"rendered":"About 3q26 Microduplication Syndrome"},"content":{"rendered":"\n<div style=\"border:solid #ffe6e6 0.8rem;background-color: #fff9f9;padding:3% 5%;margin:1rem 0 3rem;\"><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u6b21<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Article_Summary\" >Article Summary<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#What_Is_3q26_Microduplication_Syndrome\" >What Is 3q26 Microduplication Syndrome?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#How_rare_is_this_condition\" >How rare is this condition?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Causes_The_Role_of_the_TBL1XR1_and_SOX2_Genes\" >Causes: The Role of the TBL1XR1 and SOX2 Genes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Main_Symptoms_and_Physical_Features\" >Main Symptoms and Physical Features<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Developmental_delay_and_intellectual_difficulty\" >Developmental delay and intellectual difficulty<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Cardiac_genitourinary_and_skeletal_features\" >Cardiac, genitourinary, and skeletal features<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Sacral_and_anorectal_malformations\" >Sacral and anorectal malformations<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Diagnosis_How_NIPT_and_Definitive_Testing_Fit_In\" >Diagnosis: How NIPT and Definitive Testing Fit In<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Genetic_Counseling_and_Checking_for_Familial_Duplication\" >Genetic Counseling and Checking for Familial Duplication<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Early_Intervention_and_Multidisciplinary_Medical_Management\" >Early Intervention and Multidisciplinary Medical Management<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Family_Support_and_Where_to_Turn_for_Help\" >Family Support and Where to Turn for Help<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Approaching_Prenatal_Testing_Decisions\" >Approaching Prenatal Testing Decisions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Q_Is_3q26_microduplication_syndrome_inherited_from_a_parent\" >Q. Is 3q26 microduplication syndrome inherited from a parent?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Q_Is_it_the_same_condition_as_3q29_microduplication_syndrome\" >Q. Is it the same condition as 3q29 microduplication syndrome?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Q_What_symptoms_can_occur\" >Q. What symptoms can occur?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Q_Can_NIPT_detect_this_duplication\" >Q. Can NIPT detect this duplication?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Q_How_is_a_definitive_diagnosis_made\" >Q. How is a definitive diagnosis made?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\/#Q_Is_there_treatment_Where_can_families_turn_for_support\" >Q. Is there treatment? Where can families turn for support?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 style=\"margin-top:1rem;\"><span class=\"ez-toc-section\" id=\"Article_Summary\"><\/span>Article Summary<span class=\"ez-toc-section-end\"><\/span><\/h2><p><strong>3q26 microduplication syndrome is an extremely rare chromosomal condition, affecting fewer than 1 in 1,000,000 people, caused by an extra copy of part of the 3q26 region on the long arm of chromosome 3.<\/strong> It can involve growth delay, developmental delay or intellectual disability, distinctive facial features, and abnormalities of the heart, genitourinary system, skeleton, or sacrum\/anorectal area, though presentation varies widely depending on the size of the duplicated region and which genes it contains. Most cases arise spontaneously (de novo), but a meaningful proportion of reported cases trace back to a balanced translocation carried by a parent, so genetic counseling with a family chromosome check is worthwhile when planning a future pregnancy. Diagnosis is confirmed by chromosomal microarray, and this duplication is not covered by standard <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a> \u2014 a definitive diagnosis requires amniocentesis or chorionic villus sampling. Combining early intervention, multidisciplinary medical management, and family support can meaningfully support a child&#8217;s quality of life.<\/p><\/div>\n\n\n\n<div style=\"border:1px solid #e8608a;border-radius:8px;background:#fff5f8;padding:4% 5%;margin:1rem 0 2.5rem;\">\n<p style=\"font-weight:bold;font-size:1.05em;margin-top:0;\">What you&#8217;ll learn in this article<\/p>\n<ul style=\"margin-bottom:0;\">\n<li>What 3q26 microduplication syndrome is and why it happens (the role of the TBL1XR1 and SOX2 genes)<\/li>\n<li>Main symptoms, including developmental delay and cardiac or sacral\/anorectal abnormalities<\/li>\n<li>The chance of inheriting it from a parent, and what to check before a future pregnancy<\/li>\n<li>How chromosomal microarray diagnosis differs from <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a> and definitive testing<\/li>\n<li>How early intervention and medical management work, and where families can find support<\/li>\n<\/ul>\n<\/div>\n\n\n\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Is_3q26_Microduplication_Syndrome\"><\/span>What Is 3q26 Microduplication Syndrome?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>3q26 microduplication syndrome is a rare condition in which a small region called 3q26, on the long arm of chromosome 3, is present in one extra copy, which can affect growth, development, the heart, the skeleton, and other systems.<\/strong> Human genetic material is packaged into 46 chromosomes. Chromosome 3 is one of them, and its long-arm q26 region contains several genes involved in brain development and organ formation.<\/p>\n\n\n\n<p>&#8220;Microduplication&#8221; refers to an extra copy of a chromosomal segment so small it cannot be seen under a microscope. How symptoms present depends on how large the duplicated region is and which genes it includes, which is why two children with the same diagnosis can look quite different. International rare-disease databases report a prevalence of fewer than 1 in 1,000,000 people, and the exact frequency is not well established anywhere in the world, including Japan.<\/p>\n\n\n\n<p>Chromosome 3&#8217;s long arm also has a separate region, 3q29, where an independently reported microduplication\/microdeletion syndrome occurs. Because the names and locations look similar, they are easy to confuse, but 3q26 and 3q29 are different conditions involving different genes. It&#8217;s worth calmly checking the exact region number listed on your test report.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter\" style=\"margin:1.5rem auto;\">\n<svg role=\"img\" aria-label=\"Diagram showing that 3q26 microduplication syndrome occurs when part of the 3q26 region on the long arm of chromosome 3 is duplicated\" viewBox=\"0 0 720 260\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"max-width:720px;width:100%;height:auto;font-family:sans-serif;\">\n  <rect x=\"0\" y=\"0\" width=\"720\" height=\"260\" fill=\"#fff9fb\"\/>\n  <text x=\"360\" y=\"40\" text-anchor=\"middle\" font-size=\"20\" fill=\"#5a2b3a\">3q26 Microduplication, Illustrated<\/text>\n  <rect x=\"90\" y=\"70\" width=\"120\" height=\"150\" rx=\"14\" fill=\"#f6b8cd\"\/>\n  <text x=\"150\" y=\"60\" text-anchor=\"middle\" font-size=\"15\" fill=\"#5a2b3a\">Chromosome 3<\/text>\n  <text x=\"150\" y=\"105\" text-anchor=\"middle\" font-size=\"14\" fill=\"#5a2b3a\">Long arm (q)<\/text>\n  <rect x=\"110\" y=\"120\" width=\"80\" height=\"24\" rx=\"6\" fill=\"#e8608a\"\/>\n  <text x=\"150\" y=\"137\" text-anchor=\"middle\" font-size=\"13\" fill=\"#ffffff\">q26<\/text>\n  <text x=\"150\" y=\"200\" text-anchor=\"middle\" font-size=\"14\" fill=\"#5a2b3a\">Short arm (p)<\/text>\n  <text x=\"300\" y=\"145\" text-anchor=\"middle\" font-size=\"26\" fill=\"#9a6070\">\u2192<\/text>\n  <rect x=\"360\" y=\"70\" width=\"120\" height=\"150\" rx=\"14\" fill=\"#fbe1eb\"\/>\n  <text x=\"420\" y=\"60\" text-anchor=\"middle\" font-size=\"15\" fill=\"#5a2b3a\">Part duplicated<\/text>\n  <rect x=\"380\" y=\"105\" width=\"80\" height=\"20\" rx=\"6\" fill=\"#ffffff\" stroke=\"#e8608a\" stroke-dasharray=\"4 3\"\/>\n  <text x=\"420\" y=\"119\" text-anchor=\"middle\" font-size=\"11\" fill=\"#9a6070\">q26 (copy 1)<\/text>\n  <rect x=\"380\" y=\"130\" width=\"80\" height=\"20\" rx=\"6\" fill=\"#ffffff\" stroke=\"#e8608a\" stroke-dasharray=\"4 3\"\/>\n  <text x=\"420\" y=\"144\" text-anchor=\"middle\" font-size=\"11\" fill=\"#9a6070\">q26 (copy 2)<\/text>\n  <text x=\"600\" y=\"130\" text-anchor=\"middle\" font-size=\"15\" fill=\"#5a2b3a\">May affect growth,<\/text>\n  <text x=\"600\" y=\"155\" text-anchor=\"middle\" font-size=\"15\" fill=\"#5a2b3a\">development, and the heart<\/text>\n<\/svg>\n<figcaption>Illustration of an extra copy of part of the 3q26 region on the long arm of chromosome 3<\/figcaption>\n<\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_rare_is_this_condition\"><\/span><strong>How rare is this condition?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>International rare-disease databases list 3q26 microduplication syndrome at an extremely low frequency \u2014 fewer than 1 in 1,000,000 people. Reported cases worldwide remain limited, and the exact number of affected individuals in Japan is unknown. That scarcity of information is likely why so many families feel anxious when they first encounter this diagnosis.<\/p>\n\n\n\n<p>Chromosomal microdeletions and microduplications come in many forms, and the name and symptoms differ depending on exactly where on the chromosome the change occurs. For a general overview of how microdeletions and microduplications are understood and tested for, see our article on <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/nipt-microdeletion-risks\/?lang=en\">microdeletions and NIPT risk<\/a>. Getting the big picture can help you process what you&#8217;re reading more calmly. A separate change closer to the short-arm side of the same chromosome 3, in the 3q13.31 region, is covered in our article on <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q_13_31\/?lang=en\">3q13.31 deletion syndrome<\/a>.<\/p>\n\n\n\n    <a href=\"\/nipt\/3q_13_31\/?lang=en\" class=\"blog-card\">\n      <div class=\"blog-card-content\">\n          <div class=\"blog-card-title\">3q13.31\u6b20\u5931\u75c7\u5019\u7fa4\u306b\u3064\u3044\u3066 <\/div>\n          <div class=\"blog-card-excerpt\">3q13.31\u6b20\u5931\u75c7\u5019\u7fa4\u306f\u3001\u7b2c3\u67d3\u8272\u4f53\u306e\u9577\u8155\u306e\u4e00\u90e8\u304c\u6b20\u5931\u3059\u308b\u3053\u3068\u306b\u3088\u308b\u5e0c\u5c11\u75be\u60a3\u3067\u3001\u767a\u9054\u9045\u5ef6\u3084\u7279\u5fb4\u7684\u306a\u9854\u8c8c\u3001\u7b4b\u7dca\u5f35\u4f4e\u4e0b\u306a\u3069\u304c\u4e3b\u306a\u75c7\u72b6\u3067\u3059\u3002\u95a2\u9023...<\/div>\n      <\/div>\n    <\/a>\n\n\n\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Causes_The_Role_of_the_TBL1XR1_and_SOX2_Genes\"><\/span>Causes: The Role of the TBL1XR1 and SOX2 Genes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>The leading candidate cause of 3q26 microduplication syndrome is an increased gene dosage \u2014 an extra copy \u2014 of genes within the duplicated region, particularly TBL1XR1 and SOX2.<\/strong> The TBL1XR1 gene sits at position 3q26.32 and helps regulate gene activity by forming complexes with other proteins inside the cell. Medical literature reports that duplication of the region containing this gene can cause intellectual disability, learning difficulties, and, in some individuals, features of autism spectrum disorder, hearing loss, and delayed puberty. The same TBL1XR1 region is also known to cause a separate condition, &#8220;3q26.32 microdeletion syndrome,&#8221; when the segment is missing instead of duplicated \u2014 a paired condition in which opposite chromosomal changes (duplication versus deletion) produce related symptom patterns.<\/p>\n\n\n\n<p>The SOX2 gene sits at 3q26.33, further toward the end of the chromosome than TBL1XR1, and plays a deep role in brain and eye development. Because it helps maintain neural progenitor cells and drives their differentiation into neurons, duplications that extend to include a wide region around SOX2 are associated with more severe developmental delay, intellectual disability, autism spectrum disorder, and epilepsy in reported cases. It may help to think of it this way: whether the duplication stays confined near TBL1XR1 or extends out to SOX2 tends to influence how severe and how varied the symptoms are.<\/p>\n\n\n\n<p>A wider duplication that includes 3q26 is sometimes discussed medically within the broader framework of &#8220;3q duplication syndrome (dup(3q)).&#8221; Literature reviews of this broader category repeatedly point to malformations affecting the lower (caudal) part of the body \u2014 such as sacral malformations and anorectal defects \u2014 as a recurring feature of 3q duplication syndrome. Sacral and anorectal malformations overlap in some respects with symptoms discussed in our article on <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/currarino-syndrome\/\">Currarino syndrome<\/a> (Japanese article), which is worth reviewing alongside this one for a fuller picture.<\/p>\n\n\n\n<p>Another important piece of the causes picture is how the change is inherited. A literature review of 3q duplication syndrome found that roughly 70% of reported cases trace back to a &#8220;balanced translocation&#8221; carried by one parent \u2014 a rearrangement in which chromosomal material is swapped but the total amount of genetic material is unchanged, so the carrier parent has no symptoms \u2014 while the remaining roughly 30% arise as a new (de novo) change. Some conditions, such as 8q12 duplication, are predominantly de novo, while others, like 3q26, have a meaningful share of parent-inherited cases; the pattern differs by chromosomal region even though the overall approach to causes and testing has much in common. A similarly-arising duplication on a different chromosome is discussed in our article on <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/8q12-microduplication-syndrome\/?lang=en\">8q12 microduplication syndrome<\/a>.<\/p>\n\n\n\n    <a href=\"\/nipt\/8q12-microduplication-syndrome\/?lang=en\" class=\"blog-card\">\n      <div class=\"blog-card-content\">\n          <div class=\"blog-card-title\">8q12\u5fae\u5c0f\u91cd\u8907\u75c7\u5019\u7fa4 <\/div>\n          <div class=\"blog-card-excerpt\">8q12\u5fae\u5c0f\u91cd\u8907\u75c7\u5019\u7fa4\u306e\u539f\u56e0\u3001\u4e3b\u306a\u75c7\u72b6\u3001\u6cbb\u7642\u6cd5\u3001\u4e88\u5f8c\u3001\u305d\u3057\u3066\u5bb6\u65cf\u304c\u5229\u7528\u3067\u304d\u308b\u652f\u63f4\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002\u9069\u5207\u306a\u7642\u80b2\u3068\u533b\u7642\u7ba1\u7406\u3067\u751f\u6d3b\u306e\u8cea\u3092\u5411\u4e0a...<\/div>\n      <\/div>\n    <\/a>\n\n\n\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Main_Symptoms_and_Physical_Features\"><\/span>Main Symptoms and Physical Features<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>3q26 microduplication syndrome can involve pre- and postnatal growth delay, developmental delay or intellectual disability, distinctive facial features, cardiac abnormalities, genitourinary or skeletal abnormalities, and sacral or anorectal malformations.<\/strong> Not every child has every feature, however \u2014 the range and severity depend on the size of the duplicated region and which genes it contains, so presentation is different for each child.<\/p>\n\n\n\n<p>The figure below summarizes the main symptoms that have been reported. It is a list of things that can occur, not a checklist every child will have. Use it as a starting point for discussing anything that concerns you with your child&#8217;s doctor.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter\" style=\"margin:1.5rem auto;\">\n<svg role=\"img\" aria-label=\"Diagram organizing the main symptoms reported in 3q26 microduplication syndrome into four categories: growth\/development, heart\/genitourinary, skeleton, and sacrum\/anorectal\" viewBox=\"0 0 720 300\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"max-width:720px;width:100%;height:auto;font-family:sans-serif;\">\n  <rect x=\"0\" y=\"0\" width=\"720\" height=\"300\" fill=\"#fff9fb\"\/>\n  <text x=\"360\" y=\"38\" text-anchor=\"middle\" font-size=\"20\" fill=\"#5a2b3a\">Main Symptoms That Can Occur<\/text>\n  <rect x=\"40\" y=\"60\" width=\"310\" height=\"95\" rx=\"12\" fill=\"#f6b8cd\"\/>\n  <text x=\"195\" y=\"92\" text-anchor=\"middle\" font-size=\"17\" fill=\"#5a2b3a\">Growth &amp; Development<\/text>\n  <text x=\"195\" y=\"120\" text-anchor=\"middle\" font-size=\"14\" fill=\"#5a2b3a\">Pre-\/postnatal growth delay<\/text>\n  <text x=\"195\" y=\"142\" text-anchor=\"middle\" font-size=\"14\" fill=\"#5a2b3a\">Developmental delay, learning difficulty<\/text>\n  <rect x=\"370\" y=\"60\" width=\"310\" height=\"95\" rx=\"12\" fill=\"#fbe1eb\"\/>\n  <text x=\"525\" y=\"92\" text-anchor=\"middle\" font-size=\"17\" fill=\"#5a2b3a\">Heart &amp; Genitourinary<\/text>\n  <text x=\"525\" y=\"120\" text-anchor=\"middle\" font-size=\"14\" fill=\"#5a2b3a\">Congenital heart abnormality<\/text>\n  <text x=\"525\" y=\"142\" text-anchor=\"middle\" font-size=\"14\" fill=\"#5a2b3a\">Genitourinary malformation<\/text>\n  <rect x=\"40\" y=\"175\" width=\"310\" height=\"95\" rx=\"12\" fill=\"#fbe1eb\"\/>\n  <text x=\"195\" y=\"207\" text-anchor=\"middle\" font-size=\"17\" fill=\"#5a2b3a\">Skeleton &amp; Facial Features<\/text>\n  <text x=\"195\" y=\"235\" text-anchor=\"middle\" font-size=\"14\" fill=\"#5a2b3a\">Skeletal abnormality, distinctive features<\/text>\n  <text x=\"195\" y=\"257\" text-anchor=\"middle\" font-size=\"14\" fill=\"#5a2b3a\">Hearing loss in some cases<\/text>\n  <rect x=\"370\" y=\"175\" width=\"310\" height=\"95\" rx=\"12\" fill=\"#f6b8cd\"\/>\n  <text x=\"525\" y=\"207\" text-anchor=\"middle\" font-size=\"17\" fill=\"#5a2b3a\">Sacrum &amp; Anorectal<\/text>\n  <text x=\"525\" y=\"235\" text-anchor=\"middle\" font-size=\"14\" fill=\"#5a2b3a\">Sacral malformation<\/text>\n  <text x=\"525\" y=\"257\" text-anchor=\"middle\" font-size=\"14\" fill=\"#5a2b3a\">Anorectal malformation in some cases<\/text>\n<\/svg>\n<figcaption>Overview of the main symptoms reported in 3q26 microduplication syndrome<\/figcaption>\n<\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Developmental_delay_and_intellectual_difficulty\"><\/span><strong>Developmental delay and intellectual difficulty<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Fetal growth may be slower than average before birth, and weight and height gain can be gradual after birth as well. On the developmental side, head control, walking, and first words may lag behind typical timelines, and the degree of impact on intellectual development varies. In duplications involving the TBL1XR1 region, some individuals show features of autism spectrum disorder, though not everyone does \u2014 presentation varies from person to person (a pattern known as incomplete penetrance). Recognizing delays early lets support start earlier, too.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cardiac_genitourinary_and_skeletal_features\"><\/span><strong>Cardiac, genitourinary, and skeletal features<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Congenital heart abnormalities have been reported, including small residual openings in the septum (the wall between heart chambers). Kidney or genital malformations, skeletal abnormalities, and distinctive facial features can also occur, though these are only one clue among several used in diagnosis. In cases involving the TBL1XR1 region, sensorineural hearing loss and delayed puberty have also been reported. Because heart and hearing issues are not always visible, regular echocardiograms and hearing tests are the most reliable way to catch hidden changes and protect your child&#8217;s health. Hidden changes that don&#8217;t show on the outside \u2014 that&#8217;s exactly why regular check-ups matter.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sacral_and_anorectal_malformations\"><\/span><strong>Sacral and anorectal malformations<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Wider duplications that include 3q26 have been associated with sacral malformations, anorectal defects, and, in some cases, a mass-like tissue remnant near the tailbone. These caudal (lower-body) malformations are one of the recurring features noted within the broader 3q duplication syndrome framework. A similar combination of symptoms occurs in a separate condition called <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/currarino-syndrome\/\">Currarino syndrome<\/a> (Japanese article), though the underlying genes and mechanisms differ. Because the genetic pattern and outlook can differ even when symptoms look alike, it&#8217;s reassuring to confirm with your physician or a clinical geneticist exactly which diagnosis is being followed.<\/p>\n\n\n\n<p>How to approach developmental delay is a topic many parents start thinking about during pregnancy. Our article on <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/intellectual-disability-risk-pregnancy\/\">intellectual disability and pregnancy risk<\/a> (Japanese article) may also help frame your thinking. Accurate information tends to ease excessive worry.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Diagnosis_How_NIPT_and_Definitive_Testing_Fit_In\"><\/span>Diagnosis: How NIPT and Definitive Testing Fit In<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>3q26 microduplication syndrome is diagnosed definitively with chromosomal microarray testing, which examines the duplicated region in fine detail.<\/strong> This method can detect small duplications or deletions that a standard chromosome test (karyotyping) would likely miss, thanks to its much higher resolution. In reported cases, the exact extent of the duplication is often unclear from standard chromosome testing alone and only becomes clear once a chromosomal microarray is performed. Testing is often recommended by a pediatrician or specialist center after developmental delay, a heart abnormality, or another finding raises concern.<\/p>\n\n\n\n<p>Here it helps to clarify how this relates to testing done during pregnancy. <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a> (non-invasive prenatal testing) analyzes cell-free DNA circulating in the mother&#8217;s blood \u2014 fragments of DNA from the baby that drift through the mother&#8217;s bloodstream. It is a non-definitive screening test that mainly targets trisomies 13, 18, and 21, and it cannot confirm a diagnosis on its own.<\/p>\n\n\n\n<p><strong>A microduplication like 3q26 is not covered by basic <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a>, and even expanded <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a> panels that screen all chromosomes cover only a limited set of deletion\/duplication regions.<\/strong> Some case reports from overseas describe a possible duplication being flagged through a combination of expanded <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a> and array CGH testing, but this is not a routine pathway, and practice varies by testing facility and plan. Even if an expanded <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a> panel suggests a possible duplication, that result only indicates a possibility. A definitive diagnosis requires chromosomal microarray testing performed on cells collected via amniocentesis or chorionic villus sampling.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter\" style=\"margin:1.5rem auto;\">\n<svg role=\"img\" aria-label=\"Diagram showing that NIPT is a non-definitive screening test that generally does not cover microduplications, and that a definitive diagnosis requires amniocentesis or chorionic villus sampling plus chromosomal microarray\" viewBox=\"0 0 720 260\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"max-width:720px;width:100%;height:auto;font-family:sans-serif;\">\n  <rect x=\"0\" y=\"0\" width=\"720\" height=\"260\" fill=\"#fff9fb\"\/>\n  <text x=\"360\" y=\"38\" text-anchor=\"middle\" font-size=\"20\" fill=\"#5a2b3a\">Where Each Test Fits<\/text>\n  <rect x=\"40\" y=\"65\" width=\"300\" height=\"150\" rx=\"12\" fill=\"#fbe1eb\"\/>\n  <text x=\"190\" y=\"98\" text-anchor=\"middle\" font-size=\"17\" fill=\"#5a2b3a\">Non-definitive screening<\/text>\n  <text x=\"190\" y=\"128\" text-anchor=\"middle\" font-size=\"14\" fill=\"#5a2b3a\"><a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a> (blood-based)<\/text>\n  <text x=\"190\" y=\"152\" text-anchor=\"middle\" font-size=\"13\" fill=\"#9a6070\">Microduplications generally not covered<\/text>\n  <text x=\"190\" y=\"174\" text-anchor=\"middle\" font-size=\"13\" fill=\"#9a6070\">Expanded panels have limited coverage<\/text>\n  <text x=\"190\" y=\"196\" text-anchor=\"middle\" font-size=\"13\" fill=\"#9a6070\">Indicates a possibility only<\/text>\n  <text x=\"360\" y=\"145\" text-anchor=\"middle\" font-size=\"24\" fill=\"#9a6070\">\u2192<\/text>\n  <rect x=\"380\" y=\"65\" width=\"300\" height=\"150\" rx=\"12\" fill=\"#f6b8cd\"\/>\n  <text x=\"530\" y=\"98\" text-anchor=\"middle\" font-size=\"17\" fill=\"#5a2b3a\">Definitive diagnosis<\/text>\n  <text x=\"530\" y=\"128\" text-anchor=\"middle\" font-size=\"14\" fill=\"#5a2b3a\">Amniocentesis \/ CVS<\/text>\n  <text x=\"530\" y=\"152\" text-anchor=\"middle\" font-size=\"14\" fill=\"#5a2b3a\">+ chromosomal microarray<\/text>\n  <text x=\"530\" y=\"182\" text-anchor=\"middle\" font-size=\"13\" fill=\"#9a6070\">Confirms extent of duplication<\/text>\n<\/svg>\n<figcaption>How <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a> (non-definitive) differs from definitive diagnostic testing<\/figcaption>\n<\/figure>\n\n\n\n<p>The table below summarizes what each test does. It&#8217;s designed to be understandable on its own. Knowing what each test can and can&#8217;t tell you makes it easier to receive results calmly rather than feeling overwhelmed by them.<\/p>\n\n\n\n<figure class=\"wp-table-block\"><table><thead><tr><th>Test<\/th><th>Sample<\/th><th>Category<\/th><th>Coverage for microduplications<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a><\/td><td>Maternal blood<\/td><td>Non-definitive screening<\/td><td>Generally not covered; expanded panels cover only limited regions<\/td><\/tr><tr><td>Chorionic villus sampling<\/td><td>Placental tissue<\/td><td>Definitive test (first trimester)<\/td><td>Microarray possible on collected cells<\/td><\/tr><tr><td>Amniocentesis<\/td><td>Amniotic fluid<\/td><td>Definitive test (second trimester)<\/td><td>Microarray possible on collected cells<\/td><\/tr><tr><td>Chromosomal microarray<\/td><td>Cellular DNA analysis<\/td><td>Used to confirm microduplications<\/td><td>Determines the precise extent of the duplication<\/td><\/tr><\/tbody><\/table><figcaption>Comparing <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a> with definitive testing and chromosomal microarray<\/figcaption><\/figure>\n\n\n\n<p>Definitive testing carries a small miscarriage risk \u2014 roughly 0.3% for amniocentesis and roughly 1% for chorionic villus sampling, as a general guide. Whether to proceed is your own decision. If you&#8217;re unsure, our article on <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/amniotic-fluid-test-about\/?lang=en\">what amniocentesis involves<\/a> can help you weigh it, and genetic counseling is a good place to talk it through. For an overview of what <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a> can tell you, see our article on <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/nipt-detectable-conditions\/?lang=en\">conditions NIPT may detect<\/a>.<\/p>\n\n\n\n\n\n\n<div style=\"text-align:center;margin:2em 0;\"><a href=\"https:\/\/mypage-nipt-reservation.hiro-clinic.or.jp\/registration\" target=\"_blank\" rel=\"noopener\" style=\"display:inline-block;padding:0.8em 2em;background:#e8608a;color:#fff;border-radius:30px;text-decoration:none;font-weight:bold;\">Book Your Hiro Clinic NIPT Appointment<\/a><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Genetic_Counseling_and_Checking_for_Familial_Duplication\"><\/span>Genetic Counseling and Checking for Familial Duplication<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>Because roughly 70% of reported 3q duplication syndrome cases, including those involving 3q26, trace back to a balanced translocation carried by one parent, checking both parents&#8217; chromosomes is especially important when thinking about a future pregnancy.<\/strong> A balanced translocation is a rearrangement in which chromosomal material is exchanged but the total amount is unchanged, so the parent carrying it has no symptoms. When that balanced translocation is passed to a child in an unbalanced form, it can result in a duplication or deletion, causing symptoms.<\/p>\n\n\n\n<p>Once a child is diagnosed with 3q26 microduplication syndrome, it&#8217;s generally recommended that both parents undergo chromosome testing (karyotyping) to check for a balanced translocation. If a translocation is confirmed, the recurrence risk for a future pregnancy can be estimated more precisely, which also makes it easier to discuss prenatal testing options. If no translocation is found and the change is judged to be de novo, the recurrence risk for future pregnancies is thought to be close to that of the general population. In either case, working through the family history with a genetic counselor makes it easier to see the way forward.<\/p>\n\n\n\n<p>In genetic counseling sessions, I often hear parents blame themselves, wondering, &#8220;Did we cause this duplication?&#8221; It is not caused by anything a parent did during pregnancy or in how they raise their child. I&#8217;d encourage you to think of checking for a translocation not as a search for fault, but as information that helps map out what comes next and connect with the right support sooner.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Early_Intervention_and_Multidisciplinary_Medical_Management\"><\/span>Early Intervention and Multidisciplinary Medical Management<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>There is no treatment that reverses the duplication itself in 3q26 microduplication syndrome, but combining early intervention with multidisciplinary medical management can meaningfully support a child&#8217;s development and quality of life.<\/strong> What matters most is starting support tailored to each symptom as early as possible and continuing it consistently.<\/p>\n\n\n\n<p>On the developmental side, physical therapy to build motor skills, occupational therapy for fine-motor and daily-living skills, and speech therapy to support language and communication form the core of support. If features of autism spectrum disorder are present, behavioral support and early-intervention programs may be added.<\/p>\n\n\n\n<p>Multiple specialists typically coordinate regular follow-up: pediatric cardiology for heart abnormalities, otolaryngology or audiology for hearing concerns, pediatric surgery or urology for genitourinary or sacral\/anorectal abnormalities, and pediatric endocrinology for delayed puberty. Because cardiac, hearing, and endocrine issues aren&#8217;t always visible from the outside, keeping up with scheduled screenings is what actually protects your child&#8217;s health over time.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/early-nipt-august-only\/\">Early<\/a> intervention isn&#8217;t only about formal therapy sessions. Everyday moments \u2014 mealtimes, getting dressed, play \u2014 are full of opportunities that support development. Working with specialists to build small, personalized routines step by step. That steady, unglamorous consistency is what provides the most reliable support.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Family_Support_and_Where_to_Turn_for_Help\"><\/span>Family Support and Where to Turn for Help<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>Because long-term early intervention and medical management place a psychological and financial burden on families, knowing about public assistance and support resources early on can be a meaningful source of reassurance.<\/strong> You don&#8217;t have to manage this alone \u2014 connecting with available programs and other families builds the strength to keep going.<\/p>\n\n\n\n<p>Rare conditions often come with limited information, which can feel isolating. Japan&#8217;s <a href=\"https:\/\/www.nanbyou.or.jp\/\" target=\"_blank\" rel=\"noopener\">Center for Intractable Disease Information<\/a> is a useful entry point for rare-disease information, and the <a href=\"https:\/\/www.rehab.go.jp\/ddis\/\" target=\"_blank\" rel=\"noopener\">National Rehabilitation Center for Persons with Disabilities: Developmental Disability Information and Support Center<\/a> covers developmental support. For a condition like 3q26 microduplication syndrome, where the number of patients in Japan is very small, overviews compiled by international research bodies can also help you understand the full picture: the U.S. National Institutes of Health&#8217;s <a href=\"https:\/\/rarediseases.info.nih.gov\/diseases\/19311\/3q26-microduplication-syndrome\" target=\"_blank\" rel=\"noopener\">Genetic and Rare Diseases Information Center (GARD)<\/a> and Europe&#8217;s rare-disease portal <a href=\"https:\/\/www.orpha.net\/en\/disease\/detail\/96095\" target=\"_blank\" rel=\"noopener\">Orphanet<\/a> both offer useful summaries of symptoms and research. Starting from reliable sources tends to be the calmest first step.<\/p>\n\n\n\n<p>If you&#8217;re unsure about a diagnosis or test result during pregnancy, having somewhere to speak directly with a specialist is reassuring too. Japan&#8217;s <a href=\"https:\/\/jams-prenatal.jp\/\" target=\"_blank\" rel=\"noopener\">Council for Prenatal Testing Accreditation<\/a> is a useful resource on prenatal testing (in Japanese). Local public health centers and early-intervention centers can also be a nearby point of contact.<\/p>\n\n\n\n<p>Connecting with families in a similar situation helps too. Family associations and patient groups can share hard-won, practical knowledge \u2014 day-to-day tips and how to navigate assistance programs. Combining public programs, medical care, and peer connections lets you move forward at a pace that works for your family.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Approaching_Prenatal_Testing_Decisions\"><\/span>Approaching Prenatal Testing Decisions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>There is no single right answer about whether to undergo prenatal testing \u2014 choosing to test and choosing not to are both valid decisions that belong to your family.<\/strong> Feeling anxious about results, or going back and forth right up until the last moment, is a natural response that comes from caring deeply about your baby.<\/p>\n\n\n\n<p>In counseling sessions, I&#8217;ve repeatedly heard people wrestle with whether to test at all, and how to process the results afterward. Coming across an unfamiliar name like 3q26 on a test report or in reference material can trigger anxiety on its own. Start by working through what the name actually means, one piece at a time, and separating what&#8217;s a possibility from what&#8217;s confirmed. You don&#8217;t need every decision settled before you have testing done.<\/p>\n\n\n\n<p>It&#8217;s also worth knowing that the scope of expanded <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a> panels, and the follow-up support offered if a result comes back positive, vary by testing facility. Accredited facilities generally offer genetic counseling before and after testing, which tends to make it easier to move smoothly into definitive testing or a specialist referral if a result is positive. If you&#8217;re unsure which facility to choose, working through your questions one by one in genetic counseling can help.<\/p>\n\n\n\n<p>If you&#8217;re feeling uncertain, working through it with a genetic counselor can help you organize your thinking. What a test can and cannot tell you. How you want to receive the results. Talking it through tends to bring clarity to how you and your partner actually feel. Please don&#8217;t face difficult topics like pregnancy termination or miscarriage alone \u2014 lean on the support of a specialist.<\/p>\n\n\n\n<div style=\"text-align:center;margin:2em 0;\"><a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/line-registration\/?lang=en\" target=\"_blank\" rel=\"noopener\" style=\"display:inline-block;padding:0.8em 2em;background:#e8608a;color:#fff;border-radius:30px;text-decoration:none;font-weight:bold;\">Free Consultation via LINE About Your Pregnancy Concerns<\/a><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q_Is_3q26_microduplication_syndrome_inherited_from_a_parent\"><\/span><strong>Q. Is 3q26 microduplication syndrome inherited from a parent?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A literature review of 3q duplication syndrome, including 3q26, found that roughly 70% of reported cases trace back to a balanced translocation carried by one parent, while the remaining roughly 30% arise as a new (de novo) change. Checking which parent carries a translocation, if any, allows the recurrence risk for a future pregnancy to be estimated more precisely.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q_Is_it_the_same_condition_as_3q29_microduplication_syndrome\"><\/span><strong>Q. Is it the same condition as 3q29 microduplication syndrome?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>No, it&#8217;s a different condition. 3q26 and 3q29 are both located on the long arm of chromosome 3, but they involve different positions and different genes. Because the names look similar and are easy to confuse, check the region number (q26 or q29) listed on your test report.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q_What_symptoms_can_occur\"><\/span><strong>Q. What symptoms can occur?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Pre- and postnatal growth delay, developmental delay or intellectual disability, distinctive facial features, cardiac abnormalities, genitourinary or skeletal abnormalities, and sacral or anorectal malformations can all occur. Presentation differs from child to child depending on the size of the duplication and which genes are involved, and not every feature will be present. If something seems off, share it with your child&#8217;s doctor.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q_Can_NIPT_detect_this_duplication\"><\/span><strong>Q. Can NIPT detect this duplication?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A microduplication like 3q26 is not covered by basic <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a>. Even expanded <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a> panels that screen all chromosomes cover only a limited set of duplication\/deletion regions and don&#8217;t necessarily include extremely rare regions individually. Because <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/\">NIPT<\/a> is a non-definitive screening test, results only indicate a possibility. A definitive diagnosis requires amniocentesis or chorionic villus sampling plus chromosomal microarray testing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q_How_is_a_definitive_diagnosis_made\"><\/span><strong>Q. How is a definitive diagnosis made?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Diagnosis is confirmed with chromosomal microarray testing, which examines the duplicated region in detail. Prenatally, this uses cells collected via amniocentesis or chorionic villus sampling. Because definitive testing carries a small miscarriage risk, whether to proceed is your own decision, best made after discussing it in genetic counseling.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q_Is_there_treatment_Where_can_families_turn_for_support\"><\/span><strong>Q. Is there treatment? Where can families turn for support?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>There is no treatment that reverses the duplication itself, but combining early intervention \u2014 physical, occupational, and speech therapy \u2014 with multidisciplinary medical management covering the heart, hearing, genitourinary system, and sacral\/anorectal area can meaningfully support development and quality of life. For support, public resources such as the Center for Intractable Disease Information and the Developmental Disability Information and Support Center, local public health and early-intervention centers, and family or patient associations can all help. You don&#8217;t have to manage this alone \u2014 draw on public programs, medical care, and peer connections together.<\/p>\n\n\n\n\n\n\n<div style=\"border:1px solid #f0d0dc;border-radius:12px;padding:1.2em 1.4em;margin:2.5rem 0 1rem;background:#fffafc;\">\n<p style=\"margin:0 0 0.4em;font-weight:bold;\">Author \/ Medical Supervision<\/p>\n<p style=\"margin:0;\">Dr. Hiroshi Oka \u2014 Director-in-Chief and Lab Director, Hiro Clinic (Fukumikai Medical Corporation). A graduate of Keio University School of Medicine, Dr. Oka holds a Ph.D. in Medicine and has passed the national medical licensing examinations of both Japan and the United States. He is one of only about 20 physicians in Japan to hold laboratory director credentials. He shares evidence-based information on pregnancy and prenatal testing through channels including the YouTube series &#8220;Dr. Hiroshi&#8217;s Evidence-Based Pregnancy Channel.&#8221;<\/p>\n<\/div>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\"@type\":\"Question\",\"name\":\"Is 3q26 microduplication syndrome inherited from a parent?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A literature review of 3q duplication syndrome, including 3q26, found that roughly 70% of reported cases trace back to a balanced translocation carried by one parent, while the remaining roughly 30% arise as a new (de novo) change. Checking which parent carries a translocation, if any, allows the recurrence risk for a future pregnancy to be estimated more precisely.\"}},\n    {\"@type\":\"Question\",\"name\":\"Is it the same condition as 3q29 microduplication syndrome?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, it's a different condition. 3q26 and 3q29 are both located on the long arm of chromosome 3, but they involve different positions and different genes. Because the names look similar and are easy to confuse, check the region number (q26 or q29) listed on your test report.\"}},\n    {\"@type\":\"Question\",\"name\":\"What symptoms can occur?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Pre- and postnatal growth delay, developmental delay or intellectual disability, distinctive facial features, cardiac abnormalities, genitourinary or skeletal abnormalities, and sacral or anorectal malformations can all occur. Presentation differs from child to child depending on the size of the duplication and which genes are involved, and not every feature will be present. If something seems off, share it with your child's doctor.\"}},\n    {\"@type\":\"Question\",\"name\":\"Can NIPT detect this duplication?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A microduplication like 3q26 is not covered by basic NIPT. Even expanded NIPT panels that screen all chromosomes cover only a limited set of duplication\/deletion regions and don't necessarily include extremely rare regions individually. Because NIPT is a non-definitive screening test, results only indicate a possibility. A definitive diagnosis requires amniocentesis or chorionic villus sampling plus chromosomal microarray testing.\"}},\n    {\"@type\":\"Question\",\"name\":\"How is a definitive diagnosis made?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Diagnosis is confirmed with chromosomal microarray testing, which examines the duplicated region in detail. Prenatally, this uses cells collected via amniocentesis or chorionic villus sampling. Because definitive testing carries a small miscarriage risk, whether to proceed is your own decision, best made after discussing it in genetic counseling.\"}},\n    {\"@type\":\"Question\",\"name\":\"Is there treatment? Where can families turn for support?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"There is no treatment that reverses the duplication itself, but combining early intervention \u2014 physical, occupational, and speech therapy \u2014 with multidisciplinary medical management covering the heart, hearing, genitourinary system, and sacral\/anorectal area can meaningfully support development and quality of life. For support, public resources such as the Center for Intractable Disease Information and the Developmental Disability Information and Support Center, local public health and early-intervention centers, and family or patient associations can all help. You don't have to manage this alone \u2014 draw on public programs, medical care, and peer connections together.\"}}\n  ]\n}\n<\/script>\n\n","protected":false},"excerpt":{"rendered":"Article Summary3q26 &#8230;\n <a href=\"https:\/\/www.hiro-clinic.or.jp\/nipt\/3q26_microduplication_syndrome\/?lang=en\">\u7d9a\u304d\u3092\u8aad\u3080<\/a>","protected":false},"author":101,"featured_media":87483,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[97],"tags":[],"class_list":["post-86047","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.hiro-clinic.or.jp\/nipt\/wp-json\/wp\/v2\/posts\/86047","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hiro-clinic.or.jp\/nipt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hiro-clinic.or.jp\/nipt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nipt\/wp-json\/wp\/v2\/users\/101"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nipt\/wp-json\/wp\/v2\/comments?post=86047"}],"version-history":[{"count":4,"href":"https:\/\/www.hiro-clinic.or.jp\/nipt\/wp-json\/wp\/v2\/posts\/86047\/revisions"}],"predecessor-version":[{"id":133745,"href":"https:\/\/www.hiro-clinic.or.jp\/nipt\/wp-json\/wp\/v2\/posts\/86047\/revisions\/133745"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nipt\/wp-json\/wp\/v2\/media\/87483"}],"wp:attachment":[{"href":"https:\/\/www.hiro-clinic.or.jp\/nipt\/wp-json\/wp\/v2\/media?parent=86047"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nipt\/wp-json\/wp\/v2\/categories?post=86047"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hiro-clinic.or.jp\/nipt\/wp-json\/wp\/v2\/tags?post=86047"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}