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Blood. 2014 Sep 4;124(10):1622-5. doi: 10.1182/blood-2014-05-574863. Epub 2014 Jul 29.

Hematopoietic stem cell dysfunction underlies the progressive lymphocytopenia in XLF/Cernunnos deficiency.

Author information

1
Morgan Stanley Children's Hospital of New York-Presbyterian, Department of Pediatrics, Institute for Cancer Genetics, Herbert Irving Comprehensive Cancer Research Center.
2
Herbert Irving Comprehensive Cancer Research Center, Division of Oncology, Department of Medicine, and.
3
Department of Pediatrics, Institute for Cancer Genetics, Herbert Irving Comprehensive Cancer Research Center, Pathobiology Graduate Program, College for Physicians and Surgeons, Columbia University Medical Center, New York, NY; and.
4
Department of Pediatrics, Institute for Cancer Genetics.
5
Department of Statistics, Columbia University, New York, NY.
6
Division of Oncology, Department of Medicine, and.
7
Morgan Stanley Children's Hospital of New York-Presbyterian, Department of Pediatrics, Institute for Cancer Genetics.

Abstract

XRCC4-like factor (XLF/Cernunnos) is a component of the nonhomologous end-joining (NHEJ) pathway of double-strand DNA break repair. XLF-deficient patients develop a severe progressive lymphocytopenia. Although NHEJ is required for V(D)J recombination and lymphocyte development, XLF-deficient mice have normal V(D)J recombination, highlighting the need for an alternative mechanism for the lymphocytopenia. Here, we report that XLF-deficient mice recapitulate the age-dependent lymphocytopenia of patients. We show that XLF deficiency leads to premature aging of hematopoietic stem cells (HSCs), measured by decreased functional capacity in transplantation assays, preferential myeloid reconstitution, and reduced self-renewal at a young age. We propose that premature aging of HSCs, together with previously reported defects in class-switch recombination and memory immune response, underlies the progressive and severe lymphocytopenia in XLF-deficient patients in the absence of measurable V(D)J recombination defects.

PMID:
25075129
PMCID:
PMC4155271
DOI:
10.1182/blood-2014-05-574863
[Indexed for MEDLINE]
Free PMC Article

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