TY - JOUR
T1 - MCPH1 functions in an H2AX-dependent but MDC1-independent pathway in response to DNA damage
AU - Wood, Jamie L.
AU - Singh, Namit
AU - Mer, Georges
AU - Chen, Junjie
PY - 2007/11/30
Y1 - 2007/11/30
N2 - Microcephalin (MCPH1) is one of the causative genes for the autosomal recessive disorder, primary microcephaly, characterized by dramatic reduction in brain size and mental retardation. MCPH1also functions in the DNA damage response, participating in cell cycle checkpoint control. However, how MCPH1 is regulated in the DNA damage response still remains unknown. Here we report that the ability of MCPH1 to localize to the sites of DNA double-strand breaks depends on its C-terminal tandem BRCT domains. Although MCPH1 foci formation depends on H2AX phosphorylation after DNA damage, it can occur independently of MDC1. We also show that MCPH1 binds to a phospho-H2AX peptide in vitro with an affinity similar to that of MDC1, and overexpression of wild type, but not C-BRCT mutants of MCPH1, can interfere with the foci formation of MDC1 and 53BP1. Collectively, our data suggest MCPH1 is recruited to double-strand breaks via its interaction with γH2AX, which is mediated by MCPH1 C-terminal BRCT domains. These observations support that MCPH1 acts early in DNA damage responsive pathways.
AB - Microcephalin (MCPH1) is one of the causative genes for the autosomal recessive disorder, primary microcephaly, characterized by dramatic reduction in brain size and mental retardation. MCPH1also functions in the DNA damage response, participating in cell cycle checkpoint control. However, how MCPH1 is regulated in the DNA damage response still remains unknown. Here we report that the ability of MCPH1 to localize to the sites of DNA double-strand breaks depends on its C-terminal tandem BRCT domains. Although MCPH1 foci formation depends on H2AX phosphorylation after DNA damage, it can occur independently of MDC1. We also show that MCPH1 binds to a phospho-H2AX peptide in vitro with an affinity similar to that of MDC1, and overexpression of wild type, but not C-BRCT mutants of MCPH1, can interfere with the foci formation of MDC1 and 53BP1. Collectively, our data suggest MCPH1 is recruited to double-strand breaks via its interaction with γH2AX, which is mediated by MCPH1 C-terminal BRCT domains. These observations support that MCPH1 acts early in DNA damage responsive pathways.
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U2 - 10.1074/jbc.M705245200
DO - 10.1074/jbc.M705245200
M3 - Article
C2 - 17925396
AN - SCOPUS:36849000716
SN - 0021-9258
VL - 282
SP - 35416
EP - 35423
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 48
ER -