Abstract:

Histone H2AX becomes phosphorylated in chromatin domains flanking sites of DNA double-strand breakage associated with gamma-irradiation, meiotic recombination, DNA replication, and antigen receptor rearrangements. Here, we show that loss of a single H2AX allele compromises genomic integrity and enhances the susceptibility to cancer in the absence of p53. In comparison with heterozygotes, tumors arise earlier in the H2AX homozygous null background, and H2AX(-/-) p53(-/-) lymphomas harbor an increased frequency of clonal nonreciprocal translocations and amplifications. These include complex rearrangements that juxtapose the c-myc oncogene to antigen receptor loci. Restoration of the H2AX null allele with wild-type H2AX restores genomic stability and radiation resistance, but this effect is abolished by substitution of the conserved serine phosphorylation sites in H2AX with alanine or glutamic acid residues. Our results establish H2AX as genomic caretaker that requires the function of both gene alleles for optimal protection against tumorigenesis.

Open in

PUBMED | PMC | Google Scholar | Wikipedia

Relations:

Content

Citations

(186)

References

(62)

Diseases

(1)

Conditions

(2)

Drugs

(1)

Chemicals

(2)

Genes

(2)

Organisms

(3)

Processes

(4)

Anatomy

(4)

Affiliates

(2)

H2AX Haploinsufficiency Modifies Genomic Stability and Tumor Susceptibility

Arkady Celeste

Simone Difilippantonio

Michael Difilippantonio

Oscar Fernandez-Capetillo

^{Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892}

^{Genetics Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892}

^{Veterinary Resources Program, Office of Research Services, National Institutes of Health, Bethesda, Maryland 20892}

^{Laboratory of Molecular Pharmacology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892}

^{Contributed equally.}

^{Correspondence:}vog.hin@giewznessun_erdna

Copyright notice

Summary

Histone H2AX becomes phosphorylated in chromatin domains flanking sites of DNA double-strand break-age associated with γ-irradiation, meiotic recombination, DNA replication, and antigen receptor rearrangements. Here, we show that loss of a single H2AX allele compromises genomic integrity and enhances the susceptibility to cancer in the absence of p53. In comparison with heterozygotes, tumors arise earlier in the H2AX homozygous null background, and H2AX^p53^{lymphomas harbor an increased frequency of clonal nonreciprocal translocations and amplifications. These include complex rearrangements that juxtapose the c-}myc oncogene to antigen receptor loci. Restoration of the H2AX null allele with wild-type H2AX restores genomic stability and radiation resistance, but this effect is abolished by substitution of the conserved serine phosphorylation sites in H2AX with alanine or glutamic acid residues. Our results establish H2AX as genomic caretaker that requires the function of both gene alleles for optimal protection against tumorigenesis.

Summary

Collaboration tool especially designed for Life Science professionals.Drag-and-drop any entity to your messages.

Learn More