Multiple origins of sex chromosome fusions correlated with chiasma localization in Habronattus jumping spiders (Araneae: Salticidae).

ABSTRACT: Entelegyne spiders rarely show fusions yielding neo-Y chromosomes, which M. J. D. White attributed to a constraint in spiders, namely their proximal chiasma localization acting to upset meiotic segregation in males with fusions. Of the 75 taxa of Habronattus and outgroups studied, 47 have X1 X2 0 sex chromosomes in males, 10 have X1 X2 Y, 15 have X1 X2 X3 Y, 2 have X0, and one has both X1 X2 0 and X1 X2 X3 Y. Chromosome numbers and behavior suggest neo-Ys formed by an autosome-X fusion to make X1 X2 Y, with a second fusion to an autosome to make X1 X2 X3 Y. Phylogeny shows at least 8-15 gains (or possibly some losses) of neo-Y (i.e., X-autosome fusions), a remarkable number for such a small clade. In contrast to the many X-autosome fusions, at most one autosome-autosome fusion is indicated

SUBMITTER: Maddison WP 

PROVIDER: S-EPMC7163710 | biostudies-literature | 2013 Aug

REPOSITORIES: biostudies-literature