水稻和小麦族基因组中精细尺度DNA标记顺序的保守性。
Conservation of fine-scale DNA marker order in the genomes of rice and the Triticeae.
作者信息
Dunford R P, Kurata N, Laurie D A, Money T A, Minobe Y, Moore G
机构信息
Department of Cereals Research, John Innes Centre, Norwich, UK.
出版信息
Nucleic Acids Res. 1995 Jul 25;23(14):2724-8. doi: 10.1093/nar/23.14.2724.
Abstract
DNA markers distribute over large chromosomal regions exhibit conservation of order (collinearity) in different cereal species, but it is not known whether this is maintained on a finer scale, i.e. < or = 2 cM. To address this, sets of two or more genetically linked DNA markers were localised to yeast artificial chromosomes containing rice DNA inserts. Linkage analysis of these DNA markers in barley revealed complete correspondence with their genetic order in rice, the distance between linked sequences on rice chromosomes being < 1.6 cM or < or = 1 + 10(6) bp (1 Mb). Thus, DNA markers separated in this range are collinear in rice, barley and, by inference, other members of the Triticeae. These results are discussed with respect to the use of rice as a key system for the isolation of cereal genes.
摘要
分布在大染色体区域的DNA标记在不同的谷类物种中呈现出顺序保守性（共线性），但尚不清楚在更精细的尺度上（即小于或等于2厘摩）是否依然如此。为了解决这个问题，将两组或更多组遗传连锁的DNA标记定位到含有水稻DNA插入片段的酵母人工染色体上。对这些DNA标记在大麦中的连锁分析表明，它们与在水稻中的遗传顺序完全对应，水稻染色体上连锁序列之间的距离小于1.6厘摩或小于或等于1×10⁶碱基对（1兆碱基）。因此，在这个范围内分离的DNA标记在水稻、大麦以及由此推断的小麦族其他成员中是共线的。本文就利用水稻作为分离谷类基因的关键系统对这些结果进行了讨论。
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