Characterization of the genomic structure of the human neuronal nicotinic acetylcholine receptor CHRNA5/A3/B4 gene cluster and identification of novel intragenic polymorphisms

S. Duga, G. Soldà, R. Asselta, M. T. Bonati, L. Dalprà, M. Malcovati, M. L. Tenchini

Research output: Contribution to journalArticlepeer-review

Abstract

Genes coding for the α5, α3, and β4 subunits (CHRNA5, CHRNA3, and CHRNB4) of the neuronal nicotinic acetylcholine receptors (nAChRs) are clustered on chromosome 15q24. Linkage of this chromosomal region to autosomal dominant nocturnal frontal lobe epilepsy (ADNFLE), an idiopathic partial epilepsy, was reported in one family. Moreover, mutations in other neuronal nAChR subunit genes coding for the α4 (CHRNA4) and the β2 (CHRNB2) subunits were associated with ADNFLE. Apart from the exon-intron structure of CHRNA3, the genomic organization of this gene cluster was unknown, making comprehensive mutational analyses impossible. The genomic structure of CHRNA5 and CHRNB4 is here reported. Moreover, two hitherto unknown introns were identified within the 3′ untranslated region of CHRNA3, causing a partial tail-to-tail overlap with CHRNA5. Four novel intragenic polymorphisms were identified and characterized in the cluster.

Original languageEnglish
Pages (from-to)640-648
Number of pages9
JournalJournal of Human Genetics
Volume46
Issue number11
DOIs
Publication statusPublished - 2001

Keywords

  • Autosomal dominant nocturnal frontal lobe epilepsy (ADNFLE)
  • CHRNA5/A3/B4 gene cluster
  • Genomic structure
  • Human neuronal nicotinic acetylcholine receptor (nAChR)
  • Polymorphisms
  • Tail-to-tail overlap

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics

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