Phosphorylation of the axial element protein Hop1 by Mec1/Tel1 ensures meiotic interhomolog recombination

Carballo, Jesús A, Johnson, Anthony L, Sedgwick, Steven G and Cha, Rita S (2008) Phosphorylation of the axial element protein Hop1 by Mec1/Tel1 ensures meiotic interhomolog recombination. Cell, 132 (5). pp. 758-770. ISSN 0092-8674

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Abstract

An essential feature of meiosis is interhomolog recombination whereby a significant fraction of the programmed meiotic double-strand breaks (DSBs) is repaired using an intact homologous non-sister chromatid rather than a sister. Involvement of Mec1 and Tel1, the budding yeast homologs of the mammalian ATR and ATM kinases, in meiotic interhomlog bias has been implicated, but the mechanism remains elusive. Here, we demonstrate that Mec1 and Tel1 promote meiotic interhomolog recombination by targeting the axial element protein Hop1. Without Mec1/Tel1 phosphorylation of Hop1, meiotic DSBs are rapidly repaired via a Dmc1-independent intersister repair pathway, resulting in diminished interhomolog crossing-over leading to spore lethality. We find that Mec1/Tel1-mediated phosphorylation of Hop1 is required for activation of Mek1, a meiotic paralogue of the DNA-damage effector kinase, Rad53p/CHK2. Thus, Hop1 is a meiosis-specific adaptor protein of the Mec1/Tel1 signaling pathway that ensures interhomolog recombination by preventing Dmc1-independent repair of meiotic DSBs.

Item Type: Article
Schools and Departments: School of Life Sciences > Sussex Centre for Genome Damage and Stability
Subjects: Q Science
Q Science > QH Natural history > QH0001 Natural history (General) > QH0201 Microscopy
Q Science > QH Natural history > QH0301 Biology > QH0426 Genetics
Q Science > QH Natural history > QH0301 Biology > QH0426 Genetics > QH0447 Genes. Alleles. Genome
Q Science > QH Natural history > QH0301 Biology > QH0471 Reproduction
Q Science > QH Natural history > QH0301 Biology > QH0501 Life
Q Science > QH Natural history > QH0301 Biology
Q Science > QH Natural history > QH0301 Biology > QH0426 Genetics > QH0460 Mutations
Depositing User: Jesus Carballo
Date Deposited: 11 Jul 2014 07:14
Last Modified: 08 Mar 2017 08:36
URI: http://sro.sussex.ac.uk/id/eprint/49244

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