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Blood, Vol. 96 No. 1 (July 1), 2000:
pp. 203-209
N-terminal truncated human RAG1 proteins can direct
T-cell receptor but not immunoglobulin gene rearrangements
Jeroen G. Noordzij,
Nicole S. Verkaik,
Nico G. Hartwig,
Ronald de Groot,
Dik C. van Gent, and
Jacques J. M. van Dongen
From the Department of Immunology, Erasmus University Rotterdam,
University Hospital Rotterdam-Dijkzigt; the Department of Cell Biology
and Genetics, Erasmus University Rotterdam; and the Department of
Pediatrics, Division of Infectious Diseases and Immunology, Sophia
Children's Hospital/University Hospital Rotterdam, Rotterdam, The
Netherlands.
The proteins encoded by RAG1 and RAG2 can
initiate gene recombination by site-specific cleavage of DNA in
immunoglobulin and T-cell receptor (TCR) loci. We identified a new
homozygous RAG1 gene mutation (631delT) that leads to a
premature stop codon in the 5' part of the RAG1 gene. The
patient carrying this 631delT RAG1 gene mutation died at the
age of 5 weeks from an Omenn syndrome-like T+/B
severe combined immunodeficiency disease. The high number of
blood T-lymphocytes (55 × 106/mL) showed an almost
polyclonal TCR gene rearrangement repertoire not of maternal origin. In
contrast, B-lymphocytes and immunoglobulin gene rearrangements were
hardly detectable. We showed that the 631delT RAG1 gene can
give rise to an N-terminal truncated RAG1 protein, using an internal
AUG codon as the translation start site. Consistent with the V(D)J
recombination in T cells, this N-terminal truncated RAG1 protein was
active in a plasmid V(D)J recombination assay. Apparently, the
N-terminal truncated RAG1 protein can recombine TCR genes but not
immunoglobulin genes. We conclude that the N-terminus of the RAG1
protein is specifically involved in immunoglobulin gene rearrangements.

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