Abstract:
:We identified the gene carrying the juvenile spermatogonial depletion mutation (jsd), a recessive spermatogenic defect mapped to mouse chromosome 1 (refs. 1,2). We localized jsd to a 272-kb region and resequenced this area to identify the underlying mutation: a frameshift that severely truncates the predicted protein product of a 2.3-kb genomic open reading frame. This gene, Utp14b, evidently arose through reverse transcription of an mRNA from an X-linked gene and integration of the resulting cDNA into an intron of an autosomal gene, whose promoter and 5' untranslated exons are shared with Utp14b. To our knowledge, Utp14b is the first protein-coding retrogene to be linked to a recessive mammalian phenotype. The X-linked progenitor of Utp14b is the mammalian ortholog of yeast Utp14, which encodes a protein required for processing of pre-rRNA and hence for ribosome assembly. Our findings substantiate the hypothesis that mammalian spermatogenesis is supported by autosomal retrogenes that evolved from X-linked housekeeping genes to compensate for silencing of the X chromosome during male meiosis. We find that Utp14b-like retrogenes arose independently and were conserved during evolution in at least four mammalian lineages. This recurrence implies a strong selective pressure, perhaps to enable ribosome assembly in male meiotic cells.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Bradley J,Baltus A,Skaletsky H,Royce-Tolland M,Dewar K,Page DCdoi
10.1038/ng1390keywords:
subject
Has Abstractpub_date
2004-08-01 00:00:00pages
872-6issue
8eissn
1061-4036issn
1546-1718pii
ng1390journal_volume
36pub_type
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