Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Comment
. 2006 Nov 28;103(48):18031-2.
doi: 10.1073/pnas.0608879103. Epub 2006 Nov 20.

Multiple independent origins of sex chromosomes in amniotes

Eric J Vallender  1 , Bruce T Lahn
Affiliations
Comment

Multiple independent origins of sex chromosomes in amniotes

Eric J Vallender et al. Proc Natl Acad Sci U S A. .
No abstract available

PubMed Disclaimer

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Fig. 1.
Fig. 1.
Independent origins of sex chromosomes in birds, snakes, and mammals. In ancestral amniotes, which presumably used temperature-dependent sex determination, there were no sex chromosomes. Sex chromosomes then evolved from autosomes on three independent occasions in birds, snakes, and mammals. A different autosome was converted to sex chromosomes in each of these three lineages. The ZZ:ZW system emerged twice (once in birds and once in snakes), whereas the XX:XY system emerged once in mammals.
See this image and copyright information in PMC

Comment on

References

    1. Smith CA, Sinclair AH. BioEssays. 2004;26:120–132. - PubMed
    1. Matsubara K, Tarui H, Toriba M, Yamada K, Nishida-Umehara C, Agata K, Matsuda Y. Proc Natl Acad Sci USA. 2006;103:18190–18195. - PMC - PubMed
    1. Foster JW, Graves JA. Proc Natl Acad Sci USA. 1994;91:1927–1931. - PMC - PubMed
    1. Lahn BT, Pearson NM, Jegalian K. Nat Rev Genet. 2001;2:207–216. - PubMed
    1. Smith CA, Katz M, Sinclair AH. Biol Reprod. 2003;68:560–570. - PubMed

LinkOut - more resources