- Comment in:
-
Nat Genet. 1999 Apr;21(4):345-6.
A human IFNGR1 small deletion hotspot associated with dominant susceptibility to mycobacterial infection.
Jouanguy E,
Lamhamedi-Cherradi S,
Lammas D,
Dorman SE,
Fondanèche MC,
Dupuis S,
Döffinger R,
Altare F,
Girdlestone J,
Emile JF,
Ducoulombier H,
Edgar D,
Clarke J,
Oxelius VA,
Brai M,
Novelli V,
Heyne K,
Fischer A,
Holland SM,
Kumararatne DS,
Schreiber RD,
Casanova JL.
INSERM U429, Hôpital Necker-Enfants Malades, Paris, France.
The immunogenetic basis of severe infections caused by bacille Calmette-Guérin vaccine and environmental mycobacteria in humans remains largely unknown. We describe 18 patients from several generations of 12 unrelated families who were heterozygous for 1 to 5 overlapping IFNGR1 frameshift small deletions and a wild-type IFNGR1 allele. There were 12 independent mutation events at a single mutation site, defining a small deletion hotspot. Neighbouring sequence analysis favours a small deletion model of slipped mispairing events during replication. The mutant alleles encode cell-surface IFNgamma receptors that lack the intra-cytoplasmic domain, which, through a combination of impaired recycling, abrogated signalling and normal binding to IFNgamma exert a dominant-negative effect. We thus report a hotspot for human IFNGR1 small deletions that confer dominant susceptibility to infections caused by poorly virulent mycobacteria.
PMID: 10192386 [PubMed - indexed for MEDLINE]