Complex Evolutionary History of the Y Chromosome in Flies of the Drosophila obscura Species Group

被引:10
作者
Bracewell, Ryan [1 ]
Bachtrog, Doris [1 ]
机构
[1] Univ Calif Berkeley, Dept Integrat Biol, Berkeley, CA 94720 USA
来源
GENOME BIOLOGY AND EVOLUTION | 2020年 / 12卷 / 05期
基金
美国国家卫生研究院;
关键词
Y chromosome; Drosophila; neo-sex chromosome; Y degeneration; DOSAGE COMPENSATION; SEX-CHROMOSOME; ALIGNMENT; SOFTWARE; LOCATION; DYNAMICS; AUTOSOME; GENOMES; GENES; DOT;
D O I
10.1093/gbe/evaa051
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The Drosophila obscura species group shows dramatic variation in karyotype, including transitions among sex chromosomes. Members of the affinis and pseudoobscura subgroups contain a neo-X chromosome (a fusion of the X with an autosome), and ancestral Y genes have become autosomal in species harboring the neo-X. Detailed analysis of species in the pseudoobscura subgroup revealed that ancestral Y genes became autosomal through a translocation to the small dot chromosome. Here, we show that the Y-dot translocation is restricted to the pseudoobscura subgroup, and translocation of ancestral Y genes in the affinis subgroup likely followed a different route. We find that most ancestral Y genes have translocated to unique autosomal or X-linked locations in different taxa of the affinis subgroup, and we propose a dynamic model of sex chromosome formation and turnover in the obscura species group. Our results suggest that Y genes can find unique paths to escape unfavorable genomic environments that form after sex chromosome-autosome fusions.
引用
收藏
页码:494 / 505
页数:12
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