Evidence that a recent increase in maize genome size was caused by the massive amplification of intergene retrotransposons
Evidence that a recent increase in maize genome size was caused by the massive amplification of intergene retrotransposons
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DOI：
10.1006/anbo.1998.0746
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发表时间：
1998-12-01
期刊：
影响因子：
4.2
通讯作者：
Bennetzen, JL
中科院分区：
文献类型：
--
作者：
Sanmiguel, P;Bennetzen, JL
对玉米adh1基因两侧一个240kb区域内反转录转座子的大小和拷贝数的估计表明，玉米基因组的33 - 62%由在该区域发现的高拷贝数反转录转座子组成。据估计，玉米基因组另有16%由中低拷贝数反转录转座子组成。高粱基因组比玉米基因组小三倍多，在与玉米adh1同源的区域中未检测到玉米反转录转座子的任何拷贝。因此，自玉米和高粱约1600万年前从一个共同祖先分化以来，反转录转座子似乎使玉米基因组的大小增加了2到5倍。(C) 1998植物学年鉴公司
Estimates of the size and copy number of the retrotransposons in a 240 kb region Banking the adh1 gene of maize suggest that 33-62% of the maize genome is composed of the high copy-number retrotransposons found in this region. An additional 16% of the maize genome is estimated to be composed of middle and low copy-number retrotransposons. The sorghum genome, which is more than three-fold smaller than the maize genome, does not have any detected copies of the maize retrotransposons in a region orthologous to that of maize adh1. Thus, it appears that retrotransposons have increased the size of the maize genome two- to five-fold since the divergence of maize and sorghum from a common ancestor about 16 million years ago. (C) 1998 Annals of Botany Company.