Human Molecular Genetics, 2000, Vol. 9, No. 4 583-588
© 2000 Oxford University Press
A new gene involved in DNA double-strand break repair and V(D)J recombination is located on human chromosome 10p
1Développement Normal et Pathologique du Système Immunitaire, INSERM U429, Hôpital Necker Enfants Malades, 149 rue de Sèvres, 75015 Paris, France, 2Department of Pediatrics, University of California San Francisco, San Francisco, CA, USA, 3Immuno-Hématologie Pédiatrique, Hôpital Debrousse, Lyon, France and 4Unité d’Immunologie et d’Hématologie, Hôpital Necker Enfants Malades, Paris, France
V(D)J recombination, accountable for the diversity of T cell receptor- and immunoglobulin-encoding genes, is initiated by a lymphoid-specific DNA double-strand break. The general DNA repair machinery is responsible for the resolution of this break. Any defect in one of the known components of the DNA repair/V(D)J recombination machinery (Ku70, Ku80, DNA-PKcs, XRCC4 and DNA ligase IV) leads to abortion of the V(D)J rearrangement process, early block in both T and B cell maturation, and ultimately to severe combined immune deficiency (SCID) in several animal models. A human SCID condition is also characterized by an absence of mature T and B lymphocytes, and is associated with an increase in sensitivity to DNA-damaging agents (RS-SCID). None of the above-mentioned genes are defective in these patients, arguing for the likelihood of the existence of yet another unknown component of the V(D)J recombination/DNA repair apparatus. Athabascan-speaking (SCIDA) Navajo and Apache Native Americans have a very high incidence of T–B– SCID. The SCIDA locus is highly linked with markers on chromosome 10p, although the exact molecular defect has not been recognized in these patients. We show here that cells with the SCIDA defect are impaired in the DNA repair phase of V(D)J recombination similarly to RS-SCID, precisely an absence of V(D)J coding joint formation. Moreover, genotyping analysis in several RS-SCID families corroborates a linkage of the RS-SCID locus to the SCIDA region on chromosome 10p. These results demonstrate the presence of a new essential DNA repair/V(D)J recombination gene in this region, the mutation of which causes RS-SCID in humans.
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