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  • 1
    ISSN: 1572-9931
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Recently we have purified to homogeneity and characterized an interferon-induced human protein (p78 protein) which is the equivalent of the interferon-induced murine Mx protein responsible for a specific antiviral state against influenza virus infection. A cDNA library was constructed using mRNAs from interferon-induced human diploid fibroblasts. cDNA clones coding for the human p78 protein were identified and used to determine the chromosomal location of the corresponding gene (termedIFI-78K gene) by hybridization to DNA from a panel of human x rodent somatic cell hybrids. The newly identified gene is located on chromosome 21. This has been confirmed by the observation of a gene dosage effect using chromosome 21 trisomic cells (fibroblasts derived from Down's syndrome patients). Among all interferon-inducible genes mapped so far, theIFI-78K gene is the only one located on chromosome 21, together with the gene for the receptor of type I interferon. Our results also provide further evidence for homology between human chromosome 21 and mouse chromosome 16, since the gene encoding the mouse Mx protein (the presumed mouse homolog protein of human p78 protein) has been assigned to chromosome 16.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-9931
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract When cells are treated with interferon several new proteins are induced. We have isolated by differential screening two cDNA clones corresponding to human genes inducible by IFN-α, termed IFI-4 and IFI-54K. The accumulation of the corresponding mRNA was followed as a function of either IFN dose or of time. The IFI-4 and IFI-54K genes, as well as two previously isolated IFN-inducible genes, namely the IFI-56K and low-molecular-weight 2–5A synthetase, were localized on the human chromosomes. Using cloned probes on Southern blots of DNA from a panel of rodent-human somatic cell hybrids, we have assigned the IFI-4 gene to chromosome 1 and the gene coding for the low-molecular-weight 2–5A synthetase to chromosome 12. We also showed that the IFI-54K and IFI-56K genes, unlike most of the IFN-inducible genes, are syntenic. They are both located on chromosome 10. In addition, evidence is given for the presence of a pseudogene homologous to IFI-56K on chromosome 13.
    Type of Medium: Electronic Resource
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