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Molecular cloning, expression analysis, and chromosomal localization of mouse Hmg1-containing sequences

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Abstract

We isolated clones encoding the mouse high-mobility-group (Hmg) chromatin protein, Hmg1, from a 7.5-day mouse embryo cDNA library. The translated amino acid sequence encodes a protein of 24,890 daltons and is identical to previously characterized mouse, rat, and hamster Hmg1. However, comparison of the two mouse Hmg1 cDNA sequences revealed nine sequence alterations. This observation, together with the finding of a complex pattern of hybridizing bands in genomic Southern analysis, suggests that mouse Hmg1 is encoded by a multigene family. The expression of Hmg1 was examined by Northern analysis of RNA isolated from the early mouse embryo and revealed a predominant 1.5-kb transcript in conjunction with low levels of a 2.5-kb transcript. Further analysis of mouse embryos by in situ hybridization showed that Hmg1 transcripts are expressed in high abundance during early mouse embryogenesis. As development progresses, Hmg1 transcript abundance is modulated in a spatially restricted and developmentally regulated manner. Chromosomal localization with recombinant inbred strains revealed that Hmg1-related sequences are widely dispersed in the mouse genome. Here we also report the mapping of six Hmg1 loci to mouse Chromosomes (Chrs) 10, 13, 16, and 17.

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Authors and Affiliations

  1. Department of Biology, University of Pennsylvania, 19104, Philadelphia, Pennsylvania, USA

    C. M. Pauken & C. W. Lo

  2. Department of Psychiatry, University of Pennsylvania, 19104, Philadelphia, Pennsylvania, USA

    D. L. Nagle & M. Bucan

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  1. C. M. Pauken
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  2. D. L. Nagle
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  3. M. Bucan
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  4. C. W. Lo
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Pauken, C.M., Nagle, D.L., Bucan, M. et al. Molecular cloning, expression analysis, and chromosomal localization of mouse Hmg1-containing sequences. Mammalian Genome 5, 91–99 (1994). https://doi.org/10.1007/BF00292334

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  • DOI: https://doi.org/10.1007/BF00292334

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