黑腹果蝇核糖体DNA间隔区的进化：X和Y染色体上不同的变异模式。
Evolution of the ribosomal DNA spacers of Drosophila melanogaster: different patterns of variation on X and Y chromosomes.
作者信息
Williams S M, Furnier G R, Fuog E, Strobeck C
出版信息
Genetics. 1987 Jun;116(2):225-32. doi: 10.1093/genetics/116.2.225.
Abstract
Length variation of the ribosomal gene spacers of Drosophila melanogaster was studied. Analysis of 47 X chromosomal and 47 Y chromosomal linked rDNA arrays collected from five continents indicates that the arrays on the two chromosomes differ qualitatively. The Y-linked arrays from around the world share little or no similarity for either their overall length or the organization of their spacers. Most of the X-linked arrays do, however, share a major length spacer of 5.1 kb. In addition, those X-linked arrays that have a major 5.1-kb band have similar spacer organization as demonstrated by genomic DNA digestions with several restriction enzymes. These data strongly support the hypothesis that spacer length patterns on only X-linked genes are maintained primarily by natural selection.
摘要
对黑腹果蝇核糖体基因间隔区的长度变异进行了研究。对从五大洲收集的47个X染色体和47个Y染色体连锁的rDNA阵列进行分析表明，两条染色体上的阵列在质量上存在差异。来自世界各地的Y连锁阵列在其总长度或间隔区组织方面几乎没有相似性。然而，大多数X连锁阵列确实共享一个5.1 kb的主要长度间隔区。此外，那些具有主要5.1 kb条带的X连锁阵列具有相似的间隔区组织，这通过用几种限制酶进行基因组DNA消化得到了证明。这些数据有力地支持了这样一种假设，即仅X连锁基因上的间隔区长度模式主要由自然选择维持。
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