BRCA2 deficiency in mice leads to meiotic impairment and infertility

Shyam K. Sharan, April Pyle, Vincenzo Coppola, Janice Babus, Srividya Swaminathan, Jamie Benedict, Deborah Swing, Betty K. Martin, Lino Tessarollo, Janice P. Evans, Jodi A. Flaws, Mary Ann Handel

Research output: Contribution to journalReview article

Abstract

The role of Brca2 in gametogenesis has been obscure because of embryonic lethality of the knockout mice. We generated Brca2-null mice carrying a human BAC with the BRCA2 gene. This construct rescues embryonic lethality and the mice develop normally. However, there is poor expression of the transgene in the gonads and the mice are infertile, allowing examination of the function of BRCA2 in gametogenesis. BRCA2-deficient spermatocytes fail to progress beyond the early prophase I stage of meiosis. Observations on localization of recombination-related and spermatogenic-related proteins suggest that the spermatocytes undergo early steps of recombination (DNA double strand break formation), but fail to complete recombination or initiate spermiogenic development. In contrast to the early meiotic prophase arrest of spermatocytes, some mutant oocytes can progress through meiotic prophase I, albeit with a high frequency of nuclear abnormalities, and can be fertilized and produce embryos. Nonetheless, there is marked depletion of germ cells in adult females. These studies provide evidence for key roles of the BRCA2 protein in mammalian gametogenesis and meiotic success.

Original languageEnglish (US)
Pages (from-to)131-142
Number of pages12
JournalDevelopment
Volume131
Issue number1
DOIs
StatePublished - Jan 1 2004
Externally publishedYes

Fingerprint

Gametogenesis
infertility
gametogenesis
Spermatocytes
embryo
Infertility
Genetic Recombination
Meiotic Prophase I
recombination
examination
BRCA2 Protein
BRCA2 Gene
evidence
Prophase
germ cell
protein
Double-Stranded DNA Breaks
Meiosis
Gonads
abnormality

Keywords

  • BRCA2
  • DNA repair
  • Meiosis
  • Oogenesis
  • Spermatogenesis

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology

Cite this

Sharan, S. K., Pyle, A., Coppola, V., Babus, J., Swaminathan, S., Benedict, J., ... Handel, M. A. (2004). BRCA2 deficiency in mice leads to meiotic impairment and infertility. Development, 131(1), 131-142. https://doi.org/10.1242/dev.00888

BRCA2 deficiency in mice leads to meiotic impairment and infertility. / Sharan, Shyam K.; Pyle, April; Coppola, Vincenzo; Babus, Janice; Swaminathan, Srividya; Benedict, Jamie; Swing, Deborah; Martin, Betty K.; Tessarollo, Lino; Evans, Janice P.; Flaws, Jodi A.; Handel, Mary Ann.

In: Development, Vol. 131, No. 1, 01.01.2004, p. 131-142.

Research output: Contribution to journalReview article

Sharan, SK, Pyle, A, Coppola, V, Babus, J, Swaminathan, S, Benedict, J, Swing, D, Martin, BK, Tessarollo, L, Evans, JP, Flaws, JA & Handel, MA 2004, 'BRCA2 deficiency in mice leads to meiotic impairment and infertility', Development, vol. 131, no. 1, pp. 131-142. https://doi.org/10.1242/dev.00888
Sharan SK, Pyle A, Coppola V, Babus J, Swaminathan S, Benedict J et al. BRCA2 deficiency in mice leads to meiotic impairment and infertility. Development. 2004 Jan 1;131(1):131-142. https://doi.org/10.1242/dev.00888
Sharan, Shyam K. ; Pyle, April ; Coppola, Vincenzo ; Babus, Janice ; Swaminathan, Srividya ; Benedict, Jamie ; Swing, Deborah ; Martin, Betty K. ; Tessarollo, Lino ; Evans, Janice P. ; Flaws, Jodi A. ; Handel, Mary Ann. / BRCA2 deficiency in mice leads to meiotic impairment and infertility. In: Development. 2004 ; Vol. 131, No. 1. pp. 131-142.
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