小麦异源多倍体化后 DNA 消除的发育时间。
Developmental timing of DNA elimination following allopolyploidization in wheat.
机构信息
Department of Life Sciences, Ben-Gurion University, Beer-Sheva, Israel.
出版信息
Genetics. 2010 May;185(1):387-90. doi: 10.1534/genetics.110.116178. Epub 2010 Mar 9.
Abstract
The elimination of DNA sequences following allopolyploidization is a well-known phenomenon. Yet, nothing is known about the biological significance, the mechanism, or the precise developmental timing of this event. In this study, we have observed reproducible elimination of an Aegilops tauschii allele in the genome of the second generation (S2) of a newly synthesized allohexaploid derived from a cross between Triticum turgidum and Ae. tauschii. We show that elimination of the Ae. tauschii allele did not occur in germ cells but instead occurred during S2 embryo development. This work shows that deletion of DNA sequences following allopolyploidization might occur also in a tissue-specific manner.
摘要
异源多倍体化后 DNA 序列的消除是一种众所周知的现象。然而，对于该事件的生物学意义、机制或确切的发育时间，我们一无所知。在这项研究中，我们观察到在源自小麦和粗山羊草杂交的新合成异六倍体的第二代（S2）基因组中，一个节节麦等位基因可重复消除。我们表明，节节麦等位基因的消除不是在生殖细胞中发生的，而是在 S2 胚胎发育过程中发生的。这项工作表明，异源多倍体化后 DNA 序列的缺失也可能以组织特异性的方式发生。
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