{"id":1587,"date":"2024-08-05T06:31:14","date_gmt":"2024-08-04T21:31:14","guid":{"rendered":"https:\/\/www.hiro-clinic.or.jp\/nippt\/str-repeat\/"},"modified":"2024-09-03T05:47:06","modified_gmt":"2024-09-03T05:47:06","slug":"str-repeat","status":"publish","type":"post","link":"https:\/\/www.hiro-clinic.or.jp\/nippt\/str-repeat\/?lang=en","title":{"rendered":"STR and Their Use in Paternity Testing"},"content":{"rendered":"\n

What is STR?<\/strong><\/h4>\n\n\n\n

Short Tandem Repeats (STR<\/a>) are specific types of repeating sequences found in DNA. These sequences are composed of short segments of 2 to 6 base pairs that are repeated in tandem. For example, if the sequence “AGAT” appears repeatedly in a row, it forms an STR<\/a>. STRs are abundant in the human genome, and because the number of repeats varies between individuals, they are highly useful for personal identification and paternity testing.<\/p>\n\n\n\n

Repeat Number and Its Importance<\/strong><\/h4>\n\n\n\n

The repeat number of an STR<\/a> refers to how many times a particular repeating sequence occurs within the DNA. This repeat number varies between individuals and is inherited from parents to offspring. By analyzing these repeat patterns, it is possible to identify genetic relationships.<\/p>\n\n\n\n

Use of STR in Paternity Testing<\/strong><\/h4>\n\n\n\n

In paternity testing, specific STR<\/a> markers (loci) are used to create DNA profiles. These profiles are then compared to determine the relationship between the parent and child. The process generally involves the following steps:<\/p>\n\n\n\n

    \n
  1. Sample Collection:<\/strong> DNA samples are collected from the individuals being tested, typically from parents and child. Common sources include saliva, blood, or oral cells.<\/li>\n\n\n\n
  2. DNA Extraction:<\/strong> DNA is extracted from the collected samples.<\/li>\n\n\n\n
  3. STR<\/a> Analysis: <\/strong>PCR (Polymerase Chain Reaction) is used to amplify specific STR<\/a> markers. The repeat number of these amplified STR<\/a> markers is detected using fluorescent labels or other methods.<\/li>\n\n\n\n
  4. Profile Creation: <\/strong>STR<\/a> profiles for each individual are created, showing the combination of repeat numbers for each marker.<\/li>\n\n\n\n
  5. Comparison and Determination:<\/strong> The STR<\/a> profiles of the parent and child are compared. If there is a biological relationship, the child’s profile should match at least part of the parent\u2019s profile.<\/li>\n<\/ol>\n\n\n\n

    Example<\/strong><\/h4>\n\n\n\n

    Short Tandem Repeats (STR<\/a>) and Their Use in Paternity Testing<\/p>\n\n\n\n

    What are STRs?<\/strong><\/p>\n\n\n\n

    Short Tandem Repeats (STRs) are specific types of repeating sequences found in DNA. These sequences are composed of short segments of 2 to 6 base pairs that are repeated in tandem. For example, if the sequence “AGAT” appears repeatedly in a row, it forms an STR<\/a>. STRs are abundant in the human genome, and because the number of repeats varies between individuals, they are highly useful for personal identification and paternity testing.<\/p>\n\n\n\n

    Repeat Number and Its Importance<\/strong><\/p>\n\n\n\n

    The repeat number of an STR<\/a> refers to how many times a particular repeating sequence occurs within the DNA. This repeat number varies between individuals and is inherited from parents to offspring. By analyzing these repeat patterns, it is possible to identify genetic relationships.<\/p>\n\n\n\n

    Use of STRs in Paternity Testing<\/strong><\/p>\n\n\n\n

    In paternity testing, specific STR<\/a> markers (loci) are used to create DNA profiles. These profiles are then compared to determine the relationship between the parent and child. The process generally involves the following steps:<\/p>\n\n\n\n

      \n
    1. Sample Collection<\/strong>: DNA samples are collected from the individuals being tested, typically from parents and child. Common sources include saliva, blood, or oral cells.<\/li>\n\n\n\n
    2. DNA Extraction<\/strong>: DNA is extracted from the collected samples.<\/li>\n\n\n\n
    3. STR<\/a> Analysis<\/strong>: PCR (Polymerase Chain Reaction) is used to amplify specific STR<\/a> markers. The repeat number of these amplified STR<\/a> markers is detected using fluorescent labels or other methods.<\/li>\n\n\n\n
    4. Profile Creation<\/strong>: STR<\/a> profiles for each individual are created, showing the combination of repeat numbers for each marker.<\/li>\n\n\n\n
    5. Comparison and Determination<\/strong>: The STR<\/a> profiles of the parent and child are compared. If there is a biological relationship, the child’s profile should match at least part of the parent\u2019s profile.<\/li>\n<\/ol>\n\n\n\n

      Example<\/strong><\/p>\n\n\n\n

      For instance, consider the STR<\/a> profiles for a mother and child:<\/p>\n\n\n\n