Absence of mouse Rec8 cohesin promotes synapsis of sister chromatids in meiosis

Xu, Huiling, Beasley, Matthew D., Warren, William D., van der Horst, Gijsbertus T., and McKay, Michael J. (2005) Absence of mouse Rec8 cohesin promotes synapsis of sister chromatids in meiosis. Developmental Cell, 8 (6). pp. 949-961.

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REC8 is a key component of the meiotic cohesin complex. During meiosis, cohesin is required for the establishment and maintenance of sister-chromatid cohesion, for the formation of the synaptonemal complex, and for recombination between homologous chromosomes. We show that REC8 has an essential role in mammalian meiosis, in that Rec8 null mice of both sexes have germ cell failure and are sterile. In the absence of REC8, early chromosome pairing events appear normal, but synapsis occurs in a novel fashion: between sister chromatids. This implies that a major role for REC8 in mammalian meiosis is to limit synapsis to between homologous chromosomes. In all other eukaryotic species studied to date, REC8 phenotypes have been restricted to meiosis. Unexpectedly, Rec8 null mice are born in sub-Mendelian frequencies and fail to thrive. These findings illuminate hitherto unknown REC8 functions in chromosome dynamics during mammalian meiosis and possibly in somatic development.

Item ID: 1002
Item Type: Article (Research - C1)
ISSN: 1878-1551
Keywords: Cohesin; Rec8; recombination
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© 2005 Elsevier : This journal is available online - use hypertext links above.

Date Deposited: 03 Nov 2006
FoR Codes: 06 BIOLOGICAL SCIENCES > 0604 Genetics > 060403 Developmental Genetics (incl Sex Determination) @ 40%
06 BIOLOGICAL SCIENCES > 0604 Genetics > 060402 Cell and Nuclear Division @ 60%
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