A Glial-Specific Voltage-Sensitive Na Channel Gene Maps Close to Clustered Genes for Neuronal Isoforms on Mouse Chromosome 2

J. F. Potts, M. R. Regan, J. M. Rochelle, Michael F Seldin, W. S. Agnew

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A variety of glial cell types express saxitoxin (STX)-binding voltage-sensitive Na channels (1,2), although the possible role of impulse conduction in these cells is not understood. Gautron et al. (1992) recently identified a 7.5 kb species of mRNA in type 1 astrocytes cultured from rat brain cerebrum that hybridized with a "common" Na channel probe but not with brain isoform-specific cDNA probes. Sequence data from cloned cDNAs demonstrate that it encodes a structurally atypical Na channel isoform. We have prepared a cDNA probe specific for a portion of subunit domain IV of the glial channel and mapped the location of the corresponding gene (Scn7a) to mouse chromosome 2. The Scn7a gene mapped 0.9 (±0.9) cM distal to the Gcg locus; the location of the corresponding human gene (SCN7A) is predicted to be in the q36-q37 region of chromosome 2. This site lies just outside a cluster of genes for the brain-specific Na channel isoforms RI, RII and RIII which map proximal to Gcg (17). The presence of at least four genes from two distinct Na channel subfamilies suggests that multiple genetic defects for central and peripheral nervous system disorders ultimately may be linked to this area.

Original languageEnglish (US)
Pages (from-to)100-104
Number of pages5
JournalBiochemical and Biophysical Research Communications
Volume197
Issue number1
DOIs
StatePublished - Nov 30 1993
Externally publishedYes

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Chromosomes, Human, Pair 2
Chromosomes
Neuroglia
Protein Isoforms
Genes
Complementary DNA
Electric potential
Brain
Saxitoxin
Central Nervous System Diseases
Cerebrum
Peripheral Nervous System Diseases
Multigene Family
Astrocytes
Neurology
Rats
Messenger RNA
Defects

ASJC Scopus subject areas

  • Molecular Biology
  • Biophysics
  • Biochemistry

Cite this

A Glial-Specific Voltage-Sensitive Na Channel Gene Maps Close to Clustered Genes for Neuronal Isoforms on Mouse Chromosome 2. / Potts, J. F.; Regan, M. R.; Rochelle, J. M.; Seldin, Michael F; Agnew, W. S.

In: Biochemical and Biophysical Research Communications, Vol. 197, No. 1, 30.11.1993, p. 100-104.

Research output: Contribution to journalArticle

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