ATM promotes the obligate XY crossover and both crossover control and chromosome axis integrity on autosomes Journal Article
| Authors: | Barchi, M.; Roig, I.; Di Giacomo, M.; De Rooij, D. G.; Keeney, S.; Jasin, M. |
| Article Title: | ATM promotes the obligate XY crossover and both crossover control and chromosome axis integrity on autosomes |
| Abstract: | During meiosis in most sexually reproducing organisms, recombination forms crossovers between homologous maternal and paternal chromosomes and thereby promotes proper chromosome segregation at the first meiotic division. The number and distribution of crossovers are tightly controlled, but the factors that contribute to this control are poorly understood in most organisms, including mammals. Here we provide evidence that the ATM kinase or protein is essential for proper crossover formation in mouse spermatocytes. ATM deficiency causes multiple phenotypes in humans and mice, including gonadal atrophy. Mouse Atm-/- spermatocytes undergo apoptosis at mid-prophase of meiosis I, but Atm-/- meiotic phenotypes are partially rescued by Spo11 heterozygosity, such that ATM-deficient spermatocytes progress to meiotic metaphase I. Strikingly, Spo11+/-Atm-/- spermatocytes are defective in forming the obligate crossover on the sex chromosomes, even though the XY pair is usually incorporated in a sex body and is transcriptionally inactivated as in normal spermatocytes. The XY crossover defect correlates with the appearance of lagging chromosomes at metaphase I, which may trigger the extensive metaphase apoptosis that is observed in these cells. In addition, control of the number and distribution of crossovers on autosomes appears to be defective in the absence of ATM because there is an increase in the total number of MLH1 foci, which mark the sites of eventual crossover formation, and because interference between MLH1 foci is perturbed. The axes of autosomes exhibit structural defects that correlate with the positions of ongoing recombination. Together, these findings indicate that ATM plays a role in both crossover control and chromosome axis integrity and further suggests that ATM is important for coordinating these features of meiotic chromosome dynamics. © 2008 Barchi et al. |
| Keywords: | controlled study; dna binding protein; genetics; dna-binding proteins; nonhuman; cell cycle protein; animal cell; mouse; phenotype; spermatocyte; animal; cytology; meiosis; metabolism; mouse mutant; mammalia; animals; cell cycle proteins; mice; mice, knockout; spermatocytes; dna damage; homologous recombination; mus; cell division; apoptosis; protein serine threonine kinase; heterozygote; physiology; chromosome aberration; genetic recombination; protein-serine-threonine kinases; heterozygosity; tumor suppressor proteins; atm protein; x chromosome; gene inactivation; developmental disorder; chromosome aberrations; tumor suppressor protein; autosome; protein mlh1; chromosome pairing; metaphase; chromosome segregation; spo11 protein; esterase; esterases; crossing over; crossing over, genetic; y chromosome; chromosome inactivation; spontaneous abortion; sex chromosome; chromosome number; sex chromosomes |
| Journal Title: | PLoS Genetics |
| Volume: | 4 |
| Issue: | 5 |
| ISSN: | 1553-7390 |
| Publisher: | Public Library of Science |
| Date Published: | 2008-01-01 |
| Start Page: | e1000076 |
| Language: | English |
| DOI: | 10.1371/journal.pgen.1000076 |
| PUBMED: | 18497861 |
| PROVIDER: | scopus |
| PMCID: | PMC2374915 |
| DOI/URL: | |
| Notes: | --- - "Cited By (since 1996): 22" - "Export Date: 17 November 2011" - "Source: Scopus" |
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17Roig Navarro -
249Jasin
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