Abstract:
:A cDNA library prepared from lymphocytes of a cow (E98), homozygous at major histocompatibility complex (MHC) loci (BoLA phenotype w10, KN104), was screened with a bovine MHC class I probe. Of the cDNA clones isolated, two, (2.1 and 5.1) were selected and showed divergence at both 5' and 3' termini. E98 DNA was digested with rare-cutter enzymes (Sfi I, Mlu I, Not I, and Cla I) and fragments were size-separated by field inversion gel electrophoresis (FIGE). Hybridization with an entire class I cDNA probe revealed multiple fragments generated by each enzyme. When the 3' untranslated regions (UT) of 2.1 and 5.1 were used as probes, only one fragment was revealed in each digested sample, showing locus specificity of these probes in cattle. Further, DNA of transfected mouse fibroblasts L4 (expressing KN104) and L10 (expressing w10) hybridized to the 3'UT regions of clones 2.1 and 5.1, respectively. Northern blot analysis of the mRNA of the L4 and L10 transfected cells provided further evidence that the cDNA clones 2.1 and 5.1 code for the BoLA-KN104 and BoLA-w10 class I molecules respectively, and thus these represent the products of two different genes. A long range physical mapping of the BoLA-w10 and KN104 genes was performed using FIGE analysis of DNA of an homozygous and an heterozygous animal. This analysis revealed that the BoLA-w10 and KN104 genes are separated by not more than 210 kilobases (kb) and that they are components of a multigene family spanning 1550 kb. As the w10 gene is at the BoLA-A locus we assign the KN104 gene to a B locus.
journal_name
Immunogeneticsjournal_title
Immunogeneticsauthors
Bensaid A,Kaushal A,Baldwin CL,Clevers H,Young JR,Kemp SJ,MacHugh ND,Toye PG,Teale AJdoi
10.1007/BF00230502subject
Has Abstractpub_date
1991-01-01 00:00:00pages
247-54issue
4eissn
0093-7711issn
1432-1211journal_volume
33pub_type
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