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Risk, J.M. et al.

Envoplakin, a possible candidate gene for focal NEPPK/esophageal cancer ( TOC): the integration of genetic and physical maps of the TOC region on 17q25.

Focal nonepidermolytic palmoplantar keratoderma (NEPPK), or tylosis, is an autosomal, dominantly inherited disorder of the skin that manifests as focal thickening of the palmar and plantar surfaces. In three families studied, the skin disorder cosegregates with esophageal cancer and oral lesions. New haplotype analysis, presented here, places the tylosis esophageal cancer ( TOC) locus between D17S1839 and D17S785. Envoplakin (EVPL) is a protein component of desmosomes and the cornified envelope that is expressed in epidermal and esophageal keratinocytes and has been localized to the TOC region. Mutation analysis of EVPL in the three affected families failed to show tylosis-specific mutations, and haplotype analysis of three intragenic sequence polymorphisms of the EVPL gene placed it proximal to D17S1839. Confirmation of the exclusion of EVPL as the TOC gene by location was obtained by integration of the genetic and physical mapping data using radiation hybrid, YAC, BAC, and PAC clones. This new physical map will allow further identification of candidate genes underlying NEPPK associated with esophageal cancer, which may also be implicated in the development of sporadic squamous cell esophageal carcinoma and Barrett's adenocarcinoma.[1]

References

Envoplakin, a possible candidate gene for focal NEPPK/esophageal cancer (TOC): the integration of genetic and physical maps of the TOC region on 17q25. Risk, J.M., Ruhrberg, C., Hennies, H., Mills, H.S., Di Colandrea, T., Evans, K.E., Ellis, A., Watt, F.M., Bishop, D.T., Spurr, N.K., Stevens, H.P., Leigh, I.M., Reis, A., Kelsell, D.P., Field, J.K. Genomics (1999) [Pubmed]

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