A Y-linked anti-M üllerian hormone type-II receptor is the sex-determining gene in ayu, < i > Plecoglossus altivelis < /i >

by Masatoshi Nakamoto, Tsubasa Uchino, Eriko Koshimizu, Yudai Kuchiishi, Ryota Sekiguchi, Liu Wang, Ryusuke Sudo, Masato Endo, Yann Guiguen, Manfred Schartl, John H. Postlethwait, Takashi Sakamoto Whole-genome duplication and genome compaction are thought to have played important roles in teleost fish evolution. Ayu (or sweetfish),Plecoglossus altivelis, belongs to the superorder Stomiati, order Osmeriformes. Stomiati is phylogenetically classified as sister taxa of Neoteleostei. Thus, ayu holds an important position in the fish tree of life. Although ayu is economically important for the food industry and recreational fishing in Japan, few genomic resources are available for this species. To address this problem, we produced a draft genome sequence of ayu by whole-genome shotgun sequencing and constructed linkage maps using a genotyping-by-sequencing approach. Syntenic analyses of ayu and other teleost fish provided information about chromosomal rearrangements during the divergence of Stomiati, Protacanthopterygii and Neoteleostei. The size of the ayu genome indicates that genome compaction occurred after the divergence of the family Osmeridae. Ayu has an XX/XY sex-determination system for which we identified sex-associated loci by a genome-wide association study by genotyping-by-sequencing and whole-genome resequencing using wild populations. Genome-wide association mapping using wild ayu populations revealed three sex-linked scaffolds (total, 2.03 Mb). Comparison of whole...
Source: PLoS Genetics - Category: Genetics & Stem Cells Authors: Source Type: research