Amelogenin is a protein encoded by the AMELX and AMELY genes located on the X and Y chromosomes. This protein plays an important role in enamel formation during tooth development. However, in the context of forensic medicine and DNA profiling, the amelogenin gene is particularly important for gender determination.

Important points about amelogenin
Biological role: Function: Amelogenin plays an important role in enamel formation (enamellogenesis).
Expression: Expressed in enamel-forming cells (ameloblasts).
Gene Markers:.

AMELX: The amelogenin gene on the X chromosome.
AMELY: The amelogenin gene on the Y chromosome.
These genes are similar, but not identical, and allow for the distinction between X and Y chromosomes.
Forensic and genetic analysis:.

Gender determination: The amelogenin gene is used in forensic medicine to determine the sex of an individual based on DNA evidence.
PCR Analysis: During polymerase chain reaction (PCR) amplification, primers target the amelogenin gene region on the X and Y chromosomes. The different sizes of PCR products generated allow for gender identification.
AMELX: Typically, it produces a band of about 106 base pairs.
AMELY: Typically, it produces a band of about 112 base pairs.
Forensic Applications:.

Sample Analysis: When analyzing a DNA sample, the presence of both AMELX and AMELY bands indicates a male (XY) profile, while the presence of only the AMELX band indicates a female (XX) profile.
Use in DNA profiling: amelogenin is included in the Forensic DNA Profiling Kit along with other STR markers to provide a comprehensive DNA profile.
example of use
DNA sample analysis:.
Forensic samples are amplified for the amelogenin gene using PCR.
Separate PCR products using gel electrophoresis or capillary electrophoresis.
Analyze the presence and size of the bands:
XX(Female): 1 band corresponding to AMELX.
XY(Male): 2 bands corresponding to AMELX and AMELY.

Significance
Rapid and reliable: provides a rapid method for gender determination from DNA samples.
Part of DNA profiling: used in combination with other STR markers to create comprehensive DNA profiles for forensic analysis, paternity testing, and identification of human remains.
If you need further information or have specific questions about amelogenin or its applications, please feel free to ask.

医師監修監修日：2024年8月6日

岡博史（おかひろし）

医師・医学博士／ヒロクリニック統括院長

YouTubeチャンネルなどを通じて、遺伝子やNIPT（新型出生前診断）についてわかりやすく発信しています。

略歴

1996年慶應義塾大学医学部卒業
2004年慶應義塾大学医学博士号取得
2005年慶應義塾大学皮膚科学教室助手
2008年ヒロ皮フ形成クリニック開業
2009年医療法人社団福美会理事長
2015年医療法人社団福美会理事

資格・所属

CAPラボディレクター
日本皮膚科学会皮膚科専門医
日本医師会産業医
東京衛生検査所指導監督医

発信・関連リンク

この記事は、ヒロクリニックNIPTの編集・監修体制にもとづき、資格を持つ医師が内容を確認しています。

参考文献

Sullivan KM, Mannucci A, Kimpton CP, Gill P. A rapid and quantitative DNA sex test: fluorescence-based PCR of the X-Y homologous amelogenin gene. Forensic Sci Int. 1993 Dec 30;63(1-3):41-55.
Thangaraj K, Reddy AG, Singh L. Is the amelogenin gene reliable for gender identification? Forensic Sci Int. 2002 May 31;127(3):233-5.
Steinlechner M, Berger B, Niederstätter H, Parson W. Rare failures in the amelogenin sex test. Int J Legal Med. 2002 Apr;116(2):117-20.
Lahn BT, Page DC. Functional coherence of the human Y chromosome. Science. 1997 Oct 24;278(5338):675-80.