TY - JOUR
T1 - Mammalian meiosis involves DNA double-strand breaks with 3′ overhangs
AU - Zenvirth, Drora
AU - Richler, Carmelit
AU - Bardhan, Amit
AU - Baudat, Frédéric
AU - Barzilai, Ari
AU - Wahrman, Amit
AU - Simchen, Giora
N1 - Funding Information:
Acknowledgements We thank Yossi Shiloh for useful discussions and helpful comments on the manuscript. This work was supported by grants from the USA/Israel Binational Science Foundation (BSF). A.B. was supported by a Lady Davis postdoctoral fellowship and F.B. by a fellowship from the Charles H. Revson Foundation and by grants to the laboratories of Maria Jasin and Scott Keeney.
PY - 2003/3
Y1 - 2003/3
N2 - Meiotic recombination in yeast is initiated at DMA double-strand breaks (DSBs), processed into 3′ single-strand overhangs that are active in homology search, repair and formation of recombinant molecules. Are 3′ overhangs recombination intermediaries in mouse germ cells too? To answer this question we developed a novel approach based on the properties of the Klenow enzyme. We carried out two different, successive in situ Klenow enzyme-based reactions on sectioned preparations of testicular tubules. Signals showing 3′ overhangs were observed during wild-type mouse spermatogenesis, but not in Spo11-/- males, which lack meiotic DSBs. In Atm-/- mice, abundant positively stained spermatocytes were present, indicating an accumulation of non-repaired DSBs, suggesting the involvement of ATM in repair of meiotic DSBs. Thus the processing of DSBs into 3′ overhangs is common to meiotic cells in mammals and yeast, and probably in all eukaryotes.
AB - Meiotic recombination in yeast is initiated at DMA double-strand breaks (DSBs), processed into 3′ single-strand overhangs that are active in homology search, repair and formation of recombinant molecules. Are 3′ overhangs recombination intermediaries in mouse germ cells too? To answer this question we developed a novel approach based on the properties of the Klenow enzyme. We carried out two different, successive in situ Klenow enzyme-based reactions on sectioned preparations of testicular tubules. Signals showing 3′ overhangs were observed during wild-type mouse spermatogenesis, but not in Spo11-/- males, which lack meiotic DSBs. In Atm-/- mice, abundant positively stained spermatocytes were present, indicating an accumulation of non-repaired DSBs, suggesting the involvement of ATM in repair of meiotic DSBs. Thus the processing of DSBs into 3′ overhangs is common to meiotic cells in mammals and yeast, and probably in all eukaryotes.
UR - http://www.scopus.com/inward/record.url?scp=0037356604&partnerID=8YFLogxK
U2 - 10.1007/s00412-002-0223-3
DO - 10.1007/s00412-002-0223-3
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C2 - 12644952
AN - SCOPUS:0037356604
SN - 0009-5915
VL - 111
SP - 369
EP - 376
JO - Chromosoma
JF - Chromosoma
IS - 6
ER -