翻訳と辞書 |
Tetrasomy 18p : ウィキペディア英語版 | Tetrasomy 18p Tetrasomy 18p is a genetic condition that is caused by the presence of an isochromosome, composed of two copies of the short arm of chromosome 18. It is characterized by multiple medical and developmental concerns. == Genetic Basis ==
Tetrasomy 18p is caused by the presence of an additional isochromosome composed of two copies of the p arm of chromosome 18. It has been reported in both the non-mosaic as well as the mosaic state. (The phrase "mosaicism" in this context means that some cells carry the genetic change while others do not.) In the grand majority of cases, the isochromosome is ''de novo''. Although there has been some speculation that tetrasomy 18p may occur with a higher frequency in children of older mothers,〔Bugge M, Blennow E, Friedrich U, Petersen MB, Pedeutour F, Tsezou A,Frum A, Hermann S, Lyngbye T, Sarri C, Avramopoulos D, Kitsiou S,Lambert JC, Guzda M, Tommerup N, Brondum-Nielsen K. 1996. Tetrasomy 18p de novo: Parental origin and different mechanisms of formation. Eur J Hum Genet 3:160–167.〕〔Kotzot D, Bundscherer G, Bernasconi F, Brecevic L, Lurie IW, Basaran S, Baccicchetti C, H€oller A, Castellan C, Braun-Quentin C, Pfeiffer RA, Schinzel A. 1996. Isochromosome 18p results from maternal meiosis II nondisjunction. Eur J Hum Genet 4:168–174.〕 there is not enough evidence to say that this is definitively the case.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Tetrasomy 18p」の詳細全文を読む
スポンサード リンク
翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|