Confirmation of homozygosity for a single nucleotide substitution mutation in a cockayne syndrome patient using monoallelic mutation analysis in somatic cell hybrids

Lisa D. McDaniel, Randy Legerski, Alan R. Lehmann, Errol C. Friedberg, Roger A. Schultz

Research output: Contribution to journalArticle

12 Scopus citations


The identification of individuals homozygous for a specific mutation offers advantages for the elucidation of molecular mechanisms of hereditary disease states. Cockayne syndrome is a rare autosomal recessive disorder, the molecular basis of which is complicated by significant genetic and clinical heterogeneity. The genes associated with both genetic complementation groups, CSA and CS-B, have been identified. We have previously identified a number of CSA mutations, including a single base substitution that introduces a stop codon (322Tyr→Stop) mutation in the C-terminal region for at least one allele of the CSA gene in a severely affected patient. We now present data confirming the existence of homozygosity in this patient using a strategy with general applicability. Somatic cell hybrids were established by fusing patient cells with mouse A9 cells. Screening with chromosome 5 specific polymorphic markers facilitated identification of hybrid clones bearing only one of the distinct CSA alleles. Sequencing of a portion of the human CSA gene in a subset of these hybrids permitted monoallelic mutation analysis and confirmed the presence of the 322Tyr→Stop mutation in both alleles.

Original languageEnglish (US)
Pages (from-to)317-321
Number of pages5
JournalHuman mutation
Issue number4
StatePublished - Oct 20 1997



  • Cockayne syndrome
  • Homozygosity
  • Mutations
  • Somatic hybrids

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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