Genomic organization and partial duplication of the human alpha7 neuronal nicotinic acetylcholine receptor gene (CHRNA7)

Genomics. 1998 Sep 1;52(2):173-85. doi: 10.1006/geno.1998.5363.


The human alpha7 neuronal nicotinic acetylcholine receptor gene (HGMW-approved symbol CHRNA7) has been characterized from genomic clones. The gene is similar in structure to the chick alpha7 gene with 10 exons and conserved splice junction positions. The size of the human gene is estimated to be larger than 75 kb. A putative promoter 5' of the translation start in exon 1 has been cloned and sequenced. The promoter region lacks a TATA box and has a high GC content (77%). Consensus Sp1, AP-2, Egr-1, and CREB transcription factor binding sites appear to be conserved between bovine and human genes. The alpha7 nAChR gene was found to be partially duplicated, with both loci mapping to the chromosome 15q13 region. A yeast artificial chromosome contig was constructed over a genetic distance of 5 cM that includes both alpha7 loci and the region between them. Four novel exons are described, located in genomic clones containing the partially duplicated gene. The duplicated sequences, including the novel exons, are expressed in human brain.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Base Sequence
  • Cell Line
  • Cloning, Molecular
  • Contig Mapping
  • DNA / chemistry
  • DNA / genetics
  • DNA / isolation & purification
  • Exons / genetics
  • Female
  • Gene Duplication
  • Gene Expression
  • Genes / genetics*
  • Genes, Duplicate / genetics
  • Genetic Variation
  • Hippocampus / chemistry
  • Humans
  • Introns / genetics
  • Male
  • Molecular Sequence Data
  • Promoter Regions, Genetic / genetics
  • RNA / genetics
  • RNA / metabolism
  • Receptors, Nicotinic / genetics*
  • Restriction Mapping
  • Reverse Transcriptase Polymerase Chain Reaction
  • Sequence Analysis, DNA
  • alpha7 Nicotinic Acetylcholine Receptor


  • Chrna7 protein, human
  • Receptors, Nicotinic
  • alpha7 Nicotinic Acetylcholine Receptor
  • RNA
  • DNA

Associated data

  • GENBANK/AF029837
  • GENBANK/AF029838
  • GENBANK/AF029839
  • GENBANK/AF036903
  • GENBANK/AF037646