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. 1988 Jul;8(7):2797–2803. doi: 10.1128/mcb.8.7.2797

A highly conserved mouse gene with a propensity to form pseudogenes in mammals.

D L Heller 1, K M Gianola 1, L A Leinwand 1
PMCID: PMC363497  PMID: 3405219

Abstract

A mouse cDNA clone corresponding to an abundantly transcribed poly(A)+ mRNA was found to be represented by 200 copies in mammalian genomes. To understand the origin and nature of this sequence family, we studied two genomic members and two cDNA clones from mouse liver. The DNA sequence of the coding strand of a full-length cDNA clone was shown to have an open reading frame capable of encoding a 25-kilodalton polypeptide that has not been previously described. In vitro transcription-translation experiments verified the presence of an open reading frame encoding a protein of the predicted size. Restriction analysis of genomic DNA and DNA sequence analysis of genomic clones indicated that many of the 200 members of this family represent processed pseudogenes, with one or a small number of active structural genes. The vast majority of the genomic copies are heterogeneous in length, truncated at their 5' ends with respect to the mRNA, and do not appear to have intervening sequences. Two distinct genomic members of this family were sequenced and found to represent incomplete copies of the mRNA. Both are 5' truncated at slightly different points with respect to the mRNA. Both pseudogenes have multiple base changes, insertions, and deletions relative to the mRNA, and one of them encodes the poly(A) tail of the mRNA. The expression of this gene family is highest in rapidly dividing cells such as early mouse embryos and testis, but was seen in all tissues tested. This gene shows extremely high sequence conservation, extending to chicken, amphibian, and nematode genomes. Surprisingly, the gene appears to exist in only one copy in these organisms.

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