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Conservation and diversity in the class I genes of the major histocompatibility complex: Sequence analysis of a Tlac gene and comparison with a Tlac gene

Pontarotti, P. A. and Mashimo, H. and Zeff, R. A. and Fisher, D. A. and Hood, L. and Mellor, A. and Flavell, R. A. and Nathenson, S. G. (1986) Conservation and diversity in the class I genes of the major histocompatibility complex: Sequence analysis of a Tlac gene and comparison with a Tlac gene. Proceedings of the National Academy of Sciences of the United States of America, 83 (6). pp. 1782-1786. ISSN 0027-8424. http://resolver.caltech.edu/CaltechAUTHORS:PONpnas86

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Abstract

The thymus leukemia (TL) antigens, encoded by class I genes in the Tla subregion of the major histocompatibility complex (MHC), are cell surface molecules expressed on thymocytes of certain strains of mice and on certain T-cell leukemias. In order to study the fine structure and interrelationships of genes of the Tla subregion, a Tla-specific probe was isolated from the TL-encoding T13c gene of BALB/c mice (Tlac haplotype). The probe hybridized with two Tla genes in the Tlac haplotype (T13c and T3c) and with only one in the Tlab haplotype (T3b). Examination of this subset of Tla genes (T3b, T3c, and T13c) by restriction enzyme analysis and oligonucleotide hybridization studies confirmed that T3b is the allele of T3c and that T3c and T13c may have arisen by duplication. The T3b gene, while not transcribed in the tissues of the TL- strain C57BL6, was shown to be transcriptionally active in the TL-expressing leukemic cell line ERLD derived from that strain. The T3b gene was cloned and its complete DNA sequence was determined. These data permit complete comparison of two Tla-region genes, T3b and its homologue T13c, and allow us to conclude that these genes show extraordinarily high sequence conservation, in contrast to alleles of the H-2K- and H-2D-region genes. Comparison of T3b with other class I sequences in the H-2 and Qa subregions suggests that the T3-subset genes are the most divergent from other class I genes.


Item Type:Article
Additional Information:© 1986 by the National Academy of Sciences. Communicated by Alex B. Novikoff, October 24, 1985. We acknowledge the excellent assistance of Ms. D. McGovern, J. Trojnacki, E. Palmieri, R. Raval, and C. Whelan. This work was supported in part by Public Health Service Grants AI07289 and AI10702, National Cancer Institute Grant P30CA-13330, and a grant from the American Cancer Society (IM-236). S.G.N. is a member of The Irvington House Institute for Medical Research. R.A.Z. is an established Fellow of the New York Heart Association. H.M. was supported in part by National Institutes of Health Training Grant T32 GM7288. P.A.P. was supported by the Ministere de la Recherche et de l'Industrie. The publication costs of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. §1734 solely to indicate this fact.
Subject Keywords:multigene family; thymus leukemia antigen; DNA sequence
Record Number:CaltechAUTHORS:PONpnas86
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:PONpnas86
Alternative URL:http://www.pnas.org/cgi/content/abstract/83/6/1782
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9970
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Apr 2008
Last Modified:26 Dec 2012 09:55

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