基因組銘印

基因銘印（英語：Genomic imprinting）又譯遺傳印記或遺傳銘印（genetic imprinting）或基因印記是一種不遵從孟德爾定律的表觀遺傳學現象，指只有來自特定親代的等位基因得以表達。此現象已知可見於昆蟲、哺乳動物及開花植物。^[1]^[2]

在一般二倍體生物的體細胞中擁有分別來自兩個親本的兩份基因組，通常這兩份基因組中的等位基因都能表現。但少數（小於1%）的基因會受到銘印的影響，使其中一份基因失去作用，稱之為沉默，只表達等位基因中的一者。例如一種製造類胰島素的生長因子IGF-2（英語：Insulin-like growth factor 2）的基因，只有來自父親的等位基因能夠表現。有研究表明，基因印記在胚胎發生的過程中至關重要。^[3]

機制

基因銘印通常是由基因的表觀遺傳修飾導致的，多見於CpG位點的甲基化（在胞嘧啶上添加甲基），有沉默基因的作用，甲基化的等位基因表達是受抑制的，而活性等位基因是未被甲基化的。^[4]^[5]人類的基因印記是在配子（精子、卵細胞）生成的時候被重置、決定的。^[6]

參見

DNA甲基化

外部連結

這是一篇遺傳學小作品。您可以透過編輯或修訂擴充其內容。

參考文獻

^ Ohnishi, Takayuki; Sekine, Daisuke; Kinoshita, Tetsu. Chapter One - Genomic Imprinting in Plants: What Makes the Functions of Paternal and Maternal Genes Different in Endosperm Formation?. Yamamoto, Daisuke (編). Advances in Genetics. Epigenetic Shaping of Sociosexual Interactions 86. Academic Press. 2014-01-01: 1–25. doi:10.1016/b978-0-12-800222-3.00001-2.
^ Deshpande, Sharvari; Nair, Sweta; Balasinor, N. H. Chapter 2 - Genomic imprinting. Tollefsbol, Trygve (編). Epigenetics and Reproductive Health. Translational Epigenetics 21. Academic Press. 2021-01-01: 27–46 [2024-01-15]. doi:10.1016/b978-0-12-819753-0.00002-7. （原始內容存檔於2021-06-01）.
^ Tucci, Valter; Isles, Anthony R.; Kelsey, Gavin; Ferguson-Smith, Anne C.; Tucci, Valter; Bartolomei, Marisa S.; Benvenisty, Nissim; Bourc』his, Déborah; Charalambous, Marika; Dulac, Catherine; Feil, Robert. Genomic Imprinting and Physiological Processes in Mammals. Cell. 2019-02, 176 (5). ISSN 0092-8674. doi:10.1016/j.cell.2019.01.043.
^ Li, Xia. 5 - Uniparental disomy and imprinting disorders. Li, Xia (編). Cases in Laboratory Genetics and Genomics (LGG) Practice. Academic Press. 2023-01-01: 65–81. ISBN 978-0-323-99622-8. doi:10.1016/b978-0-323-99622-8.00031-9.
^ Falls, J. Greg; Pulford, David J.; Wylie, Andrew A.; Jirtle, Randy L. Genomic Imprinting: Implications for Human Disease. The American Journal of Pathology. 1999-03-01, 154 (3) [2023-11-10]. ISSN 0002-9440. PMC 1866410  . PMID 10079240. doi:10.1016/S0002-9440(10)65309-6. （原始內容存檔於2023-11-10）（英語）.
^ Li, Yufeng; Sasaki, Hiroyuki. Genomic imprinting in mammals: its life cycle, molecular mechanisms and reprogramming. Cell Research. 2011-03, 21 (3) [2024-01-15]. ISSN 1748-7838. PMC 3193417  . PMID 21283132. doi:10.1038/cr.2011.15. （原始內容存檔於2024-04-12）（英語）.

[1] Ohnishi, Takayuki; Sekine, Daisuke; Kinoshita, Tetsu. Chapter One - Genomic Imprinting in Plants: What Makes the Functions of Paternal and Maternal Genes Different in Endosperm Formation?. Yamamoto, Daisuke (編). Advances in Genetics. Epigenetic Shaping of Sociosexual Interactions 86. Academic Press. 2014-01-01: 1–25. doi:10.1016/b978-0-12-800222-3.00001-2.

[2] Deshpande, Sharvari; Nair, Sweta; Balasinor, N. H. Chapter 2 - Genomic imprinting. Tollefsbol, Trygve (編). Epigenetics and Reproductive Health. Translational Epigenetics 21. Academic Press. 2021-01-01: 27–46 [2024-01-15]. doi:10.1016/b978-0-12-819753-0.00002-7. （原始內容存檔於2021-06-01）.

[3] Tucci, Valter; Isles, Anthony R.; Kelsey, Gavin; Ferguson-Smith, Anne C.; Tucci, Valter; Bartolomei, Marisa S.; Benvenisty, Nissim; Bourc』his, Déborah; Charalambous, Marika; Dulac, Catherine; Feil, Robert. Genomic Imprinting and Physiological Processes in Mammals. Cell. 2019-02, 176 (5). ISSN 0092-8674. doi:10.1016/j.cell.2019.01.043.

[4] Li, Xia. 5 - Uniparental disomy and imprinting disorders. Li, Xia (編). Cases in Laboratory Genetics and Genomics (LGG) Practice. Academic Press. 2023-01-01: 65–81. ISBN 978-0-323-99622-8. doi:10.1016/b978-0-323-99622-8.00031-9.

[5] Falls, J. Greg; Pulford, David J.; Wylie, Andrew A.; Jirtle, Randy L. Genomic Imprinting: Implications for Human Disease. The American Journal of Pathology. 1999-03-01, 154 (3) [2023-11-10]. ISSN 0002-9440. PMC 1866410  . PMID 10079240. doi:10.1016/S0002-9440(10)65309-6. （原始內容存檔於2023-11-10）（英語）.

[6] Li, Yufeng; Sasaki, Hiroyuki. Genomic imprinting in mammals: its life cycle, molecular mechanisms and reprogramming. Cell Research. 2011-03, 21 (3) [2024-01-15]. ISSN 1748-7838. PMC 3193417  . PMID 21283132. doi:10.1038/cr.2011.15. （原始內容存檔於2024-04-12）（英語）.

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