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Association and linkage of leprosy phenotypes with HLA class II and tumour necrosis factor genes.

Abstract

Previous analyses indicate major gene control of susceptibility to leprosy per se and the HLA class II region has been implicated in determining susceptibility and control of clinical phenotype. Segregation analysis using data from 76 Brazilian leprosy multi-case pedigrees (1166 individuals) supported a two locus model as the best fit: a recessive major gene and a recessive modifier gene(s) (single locus vs two locus model, P = 0.0007). Combined segregation and linkage analysis to the major locus, showed strong linkage to HLA class II (HLA-DQB1 P = 0.000002, HLA-DQA1 P = 0.000002, HLA-DRB1 P = 0.0000003) and tumour necrosis factor genes (TNF P = 0.00002, LTA P = 0.003). Extended transmission disequilibrium testing, using multiple affected family members, demonstrated that the common allele TNF*1 of the -308 promoter region polymorphism showed linkage and/or association with disease per se, at a high level of significance (P < 0.0001). Two locus transmission disequilibrium testing suggested susceptibility (TNF*1/LTA*2) and protective (TNF*2/LTA*2) haplotypes in the class iii region. Taken together the segregation and HLA analyses suggest the possibility of more than one susceptibility locus in the MHC.

More information

Type
Journal Article
Author
Shaw M A
Donaldson I J
Collins A
Peacock C S
Lins-Lainson Z
Shaw J J
Ramos F
Silveira F
Blackwell J M
Year of Publication
2001
Journal
Genes and immunity
Volume
2
Issue
4
Number of Pages
196-204
Date Published
2001 Jun
Language
eng
ISSN Number
1466-4879
Call Number
SHAW 2001
DOI
10.1038/sj.gene.6363754
Alternate Journal
Genes Immun.
Publication Language
eng

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