The complete sequence of the MHC class II chain RT1Dα of the diabetic BB rat: MRNA levels of RT1.Dα in lymphocytes

Eugene W. Holowachuk, Mary Kay Greer, Diego R Martin

Research output: Contribution to journalArticle

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Abstract

The major histocompatibility complex of the rat (RT1 complex) encodes two sets of class II molecules referred to as RT1.B and RT1.D. The complete structure of the RT1.Dαu chain of the diabetes prone BB rat was determined by the isolation and characterization of a full size cDNA. Comparisons of the nucleotide and protein sequences of RT1 Dα with the analogous molecules, H-2 I-Eα and HLA DRα, revealed that these alpha chains have been highly conserved during evolution. Southern blot analysis indicated an association of the RT1 haplotypes, 'u' and 'l', with Bam H1 DNA bands of 9.8 kb and 11.7 kb, respectively.The BB rat develops insulin dependent diabetes as an autoimmune abnormality Accumulating evidence suggests a cellular mediated etiology and the involvement of class II molecules. The steady state levels of RT1.Dα mRNA were measured in splenic lymphocytes of diabetes prone BB rats and age matched histocompatible normal nondiabetic WF rats by a RNase protection assay. Compared to WF rats, elevated transcripts of RT1.Dα were found in lymphocytes of young BB rats (∼4× and ∼2.5× greater at 20-40 d and 40-75 d, respectively). In lymphocytes of older diabetic and nondiabetic BB rats (>75 d) the levels of RT1.Dα mRNA were lower than in the young BB rats and were found at the WF control levels. The increased steady state RT1.Dα mRNA levels in the young BB rats may reflect differences in the proportion of splenic lymphocytes expressing this gene (activated lymphocytes), and thus differences in splenic lymphocyte populations. The steady state RT1.Dα mRNA levels in lymphocytes of the normal rats were found to be relatively similar at all ages examined. The increased class II gene transcripts found in lymphocytes of young BB rats indicates that they possess a highly activated immune system.

Original languageEnglish (US)
Pages (from-to)10551-10567
Number of pages17
JournalNucleic Acids Research
Volume15
Issue number24
DOIs
StatePublished - Dec 23 1987
Externally publishedYes

Fingerprint

Inbred BB Rats
Lymphocytes
Messenger RNA
Rats
Inbred WF Rats
Diabetes
Medical problems
HLA-DR alpha-Chains
Molecules
MHC Class II Genes
Class
Rat
Ribonucleases
Southern Blotting
Genes
Major Histocompatibility Complex
Type 1 Diabetes Mellitus
Haplotypes
Gene
Immune System

ASJC Scopus subject areas

  • Statistics, Probability and Uncertainty
  • Applied Mathematics
  • Health, Toxicology and Mutagenesis
  • Toxicology
  • Genetics(clinical)
  • Genetics

Cite this

The complete sequence of the MHC class II chain RT1Dα of the diabetic BB rat : MRNA levels of RT1.Dα in lymphocytes. / Holowachuk, Eugene W.; Greer, Mary Kay; Martin, Diego R.

In: Nucleic Acids Research, Vol. 15, No. 24, 23.12.1987, p. 10551-10567.

Research output: Contribution to journalArticle

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