Abstract:
:Sequencing of the human Y chromosome has uncovered the peculiarities of the genomic organization of a heterogametic sex chromosome of old evolutionary age, and has led to many insights into the evolutionary changes that occurred during its long history. We have studied the genomic organization of the medaka fish Y chromosome, which is one of the youngest heterogametic sex chromosomes on which molecular data are available. The Y specific and adjacent regions were sequenced and compared to the X. The male sex-determining gene, dmrt1bY, appears to be the only functional gene in the Y-specific region. The Y-specific region itself is derived from the duplication of a 43-kb fragment from linkage group 9. All other coduplicated genes except dmrt1bY degenerated. The Y-specific region has accumulated large stretches of repetitive sequences and duplicated pieces of DNA from elsewhere in the genome, thereby growing to 258 kb. Interestingly the non-recombining part of the Y did not spread out considerably from the original duplicated fragment, possibly because of a large sequence duplication bordering the Y-specific fragment. This may have conserved the more ancestral structure of the medaka Y and provides insights into some of the initial processes of Y chromosome evolution.
journal_name
Genome Resjournal_title
Genome researchauthors
Kondo M,Hornung U,Nanda I,Imai S,Sasaki T,Shimizu A,Asakawa S,Hori H,Schmid M,Shimizu N,Schartl Mdoi
10.1101/gr.5016106subject
Has Abstractpub_date
2006-07-01 00:00:00pages
815-26issue
7eissn
1088-9051issn
1549-5469pii
gr.5016106journal_volume
16pub_type
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