Single nucleotide polymorphisms in MHC2TA, the gene encoding the MHC class II transactivator (CIITA)

Genes Immun. 2002 Feb;3(1):34-7. doi: 10.1038/sj.gene.6363808.


The MHC class II transactivator (CIITA) is the master regulator for HLA-D (DP, DQ, DR) gene expression. In this report the coding and promoter regions of the CIITA gene, MHC2TA, were evaluated for polymorphisms in 50 normal Caucasian individuals. Allele frequencies were obtained for four separate single nucleotide (nt) polymorphisms (SNPs) identified in the MHC2TA coding region: nt 1614 (C-->G), nt 2509 (G-->A), nt 2536 (T-->G), and nt 2791 (G-->A). MHC2TA sequence analysis of 100 chromosomes from these 50 individuals revealed a SNP in MHC2TA promoter (p) III at nt (-)155 (A-->G), but none in CIITA pI or pIV. In addition, we demonstrate the presence of splice variant at a previously undiscovered intron, accounting for a three nt (TAG) insertion at position 474 that was originally described in association with one of the disease-causing CIITA cDNA mutations in bare lymphocyte syndrome.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Alternative Splicing
  • Base Sequence
  • Chromosome Mapping
  • Gene Frequency
  • Genes, MHC Class II
  • Humans
  • Introns
  • Molecular Sequence Data
  • Mutation
  • Nuclear Proteins*
  • Polymorphism, Single Nucleotide*
  • Promoter Regions, Genetic
  • Trans-Activators / genetics*


  • MHC class II transactivator protein
  • Nuclear Proteins
  • Trans-Activators