title: Isolation of two cDNAs encoding MHC-DQA1 and -DQA2 from the water buffalo, Bubalus bubalis.
abstract: In the present study, we explored structural and functional variations and possible duplication of the major histocompatibility complex (MHC)-DQA gene in water buffalo (Bubalus bubalis). Two cDNA sequences, amplified from one individual water buffalo, were designated as Bubu-DQA1 (DQA*0101) and -DQA2 (DQA*2001). The percentage of nucleotide and amino acid similarity between Bubu-DQA1 and -DQA2 revealed that these sequences display more similarity to alleles of respective DQA1 and DQA2 genes from other ruminant species than to each other. The phylogenetic analysis also revealed a considerably larger genetic distance between these two genes than between homologous genes from other species. The larger genetic distance between DQA*0101 and DQA*2001, and the presence of different bovine DQA putative locus specific amino acid motifs, suggests these sequences are non-allelic. This finding is consistent with DQA gene duplication in other ruminants.
authors.affiliation: Animal Genetics Division, Indian Veterinary Research Institute, Izatnagar, UP 243122, India. saketniranjan@gmail.com
authors.forename: Saket K
authors.initials: SK
authors.lastname: Niranjan
authors.forename: Sitangsu M
authors.initials: SM
authors.lastname: Deb
authors.forename: Arjava
authors.initials: A
authors.lastname: Sharma
authors.forename: Abhijit
authors.initials: A
authors.lastname: Mitra
authors.forename: Subodh
authors.initials: S
authors.lastname: Kumar
mesh_terms: D000483:Alleles; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002020:Buffaloes / Q000235:genetics* / Q000276:immunology*; D002417:Cattle; D017931:DNA Primers / Q000235:genetics; D018076:DNA, Complementary / Q000235:genetics / Q000302:isolation & purification; D020440:Gene Duplication; D005802:Genes, MHC Class II; D000949:Histocompatibility Antigens Class II / Q000235:genetics*; D008969:Molecular Sequence Data; D010802:Phylogeny; D012418:Ruminants / Q000235:genetics / Q000276:immunology; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity
chemical_list: D017931:DNA Primers; D018076:DNA, Complementary; D000949:Histocompatibility Antigens Class II