Analysis of D2d: a D-region class I gene

Mary Lynne Hedley, Stephen W. Hunt, Kurt A. Brorson, Jennifer S. Andris, Leroy Hood, James Forman, Philip W. Tucker

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Abstract

The mouse major histocompatibility complex is composed of several genes arranged into the K, D, Qa, and Tla regions. The D region of the BALB/c mouse includes genes D2d, D3d, and D4d, in addition to H-2Ddand H-2Ld. We have determined the DNA sequence of the D2dgene and compared it with the known sequences of several class I genes. The exon/intron structure of the D2dgene is similar to other class I genes. It also contains similar 5′ regulatory elements. A frameshift occurs in exon seven, resulting in a gene product with a truncated cytoplasmic tail. To examine the surface expression of the D2d molecule, we generated an exon-shuffled construct containing the promoter and exons 1-3, encoding the signal peptide, α1, and α2 external domains of the D2dgene linked to exons 4-8, encoding the α3, transmembrane and cytoplasmic domains, of the H-2Ddgene. The construct was transfected into mouse L cells, and a protein was detected at the cell surface by a monoclonal antibody (mAb) specific for the α3 domain of H-2Dd, as well as by other class I-specific mAbs. Although D2d is expressed at low levels, it may be a functional class I gene that most probably evolved from a Qa region gene.

Original languageEnglish (US)
Pages (from-to)359-365
Number of pages7
JournalImmunogenetics
Volume29
Issue number6
DOIs
StatePublished - Jun 1 1989

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ASJC Scopus subject areas

  • Immunology
  • Genetics

Cite this

Hedley, M. L., Hunt, S. W., Brorson, K. A., Andris, J. S., Hood, L., Forman, J., & Tucker, P. W. (1989). Analysis of D2d: a D-region class I gene. Immunogenetics, 29(6), 359-365. https://doi.org/10.1007/BF00375863