title: Association of an extended haplotype of HLA class I alleles and their flanking microsatellites with spondyloarthropathies in South Indian patients.
abstract: Spondyloarthropathy (SpA) is a complex autoimmune disease known to have an association with the HLA system. The aims of the present study were to compare the suballelic association of HLA-B27 and other HLA class I genes with microsatellite markers spanning the HLA class I region in the South Indian population of Kerala. The five microsatellites were C1_2_A (D6S2793), C1_2_5 (D6S2811), C1_4_1 (D6S2927), MIB (D6S2810), and STR-MICA. HLA typing was performed in 67 SpA patients and 77 ethnically matched healthy controls by polymerase chain reaction using sequence-specific primers, whereas fluorescence-labeled microsatellites were analyzed using GeneScan analysis. There was a significant association of HLA-B27 and Cw*02 with SpA, whereas B*44 had a negative association with the disease. Only two HLA-B27 subtypes, B*2704 and B*2705, were observed in the South Indian population. We were able to successfully predict the major B27 subtype B*2705 based on the C1_2_5 microsatellite. A significant association of different alleles of all the microsatellite markers with SpA was observed. An extended six-locus haplotype, B*2705-Cw*02-STR-MICA(A4)-C1_4_1 (213 bp)-C1_2_5 (178 bp)-MIB (340 bp), was significantly associated with SpA.
authors.affiliation: Human Molecular Genetics Laboratory, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram 695 014, Kerala, India.
authors.forename: Rasmi
authors.initials: R
authors.lastname: Thomas
authors.forename: Joy
authors.initials: J
authors.lastname: Philip
authors.forename: Moinak
authors.initials: M
authors.lastname: Banerjee
mesh_terms: D000293:Adolescent; D000328:Adult; D000483:Alleles; D001327:Autoimmune Diseases / Q000453:epidemiology* / Q000235:genetics*; D005260:Female; D015235:HLA-B Antigens / Q000235:genetics*; D006239:Haplotypes; D015395:Histocompatibility Antigens Class I / Q000235:genetics*; D006801:Humans; D007194:India / Q000453:epidemiology; D008297:Male; D018895:Microsatellite Repeats / Q000235:genetics; D008875:Middle Aged; D017720:Molecular Epidemiology; D025242:Spondylarthropathies / Q000453:epidemiology* / Q000235:genetics*
chemical_list: D015235:HLA-B Antigens; D015395:Histocompatibility Antigens Class I