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The Journal of Immunology, Vol 146, Issue 10 3263-3272, Copyright © 1991 by American Association of Immunologists

ARTICLES

Analysis of MHC class I gene expression in adult bone marrow and fetal liver of the BALB/c mouse

H Cheroutre, M Kronenberg, K Brorson, SW Hunt 3d, P Eghtesady, L Hood and DA Nickerson
Division of Biology, California Institute of Technology, Pasadena 91125.

The BALB/c mouse has at least 29 class I genes encoded in the Qa, Tla, and Hmt (histocompatibility dependent on a maternally transmitted factor) regions of the MHC. The pattern of expression of these class Ib MHC genes is not well characterized, although some of their products such as the serologically detectable Qa-2 and TL Ag are expressed mainly in lymphoid and hematopoietic tissues. In this study, the expression pattern of BALB/c class I genes has been analyzed in adult bone marrow and fetal liver. cDNA libraries were synthesized from these tissues, and isolated class I cDNA clones were characterized by hybridization with oligonucleotide probes and by nucleotide sequence analysis. Of the 29 total class Ib genes, transcripts of five including Q6d, Q7d, T9c, T10c, and the 37 gene were isolated from the bone marrow cDNA library. Four of these can encode proteins; the sequence of the T10c gene demonstrates it is most likely a pseudogene. A non- overlapping set of three class Ib cDNA clones was obtained from the fetal liver, including T13c, the Thy 19.4 gene, and a previously uncharacterized class I gene provisionally designated as FL 57.2. Although the majority of H-2Dd cDNA clones that were analyzed lack introns, many of the class Ib cDNA clones contain intron sequences. This suggests that the expression of some of these genes may be regulated at the level of RNA splicing. The T13c gene encodes the thymus leukemia Ag in BALB/c mice. We have confirmed that the T13c gene is expressed in fetal liver by flow cytometric analysis of cells stained with anti-TL mAb.


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