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Nonsense and missense mutations in the muscular chloride channel gene Clc-1 of myotonic mice
In mature vertebrate muscle, the chloride channel Clc-1 is necessary for the stabilization of the resting potential. Its functional defect leads to the disease myotonia. The ADR mouse (phenotype ADR, genotype adr/adr) is an animal model for human myotonias. The adr gene is a member of a family of no...
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Published in: | The Journal of biological chemistry 1994-02, Vol.269 (8), p.5963-5967 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
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Online Access: | Get full text |
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Summary: | In mature vertebrate muscle, the chloride channel Clc-1 is necessary for the stabilization of the resting potential. Its functional
defect leads to the disease myotonia. The ADR mouse (phenotype ADR, genotype adr/adr) is an animal model for human myotonias.
The adr gene is a member of a family of non-complementing recessive autosomal mutations ("alleles" of adr) that cause myotonia
in the mouse. The standard allele adr has arisen by the insertion of a retroposon into the chloride channel gene Clc-1 (Steinmeyer,
K., Klocke, R., Ortland, C., Gronemeier, M., Jockusch, H., Gründer, S., and Jentsch, T. J. (1991) Nature 354, 304-308). In
order to study the nature of two other alleles, adrmto and adrK, we have analyzed overlapping Clc-1 cDNA amplification products
by the hydroxylamine and osmium tetroxide modification technique and direct sequencing. A comparison between ADR*MTO and C57BL/6
wild type showed six base pair substitutions, one of which resulted in a stop codon in position 47, whereas the five others
are either silent or lead to amino acid substitutions in non-conserved regions of the Clc-1 sequence and were already present
in the wild type inbred SWR/J strain from which adrmto was derived. The detection of the stop codon in the adrmto allele is
further indication of the identity of the Clc-1 chloride channel with the adr myotonia gene in the mouse, because a chain
termination close to the N terminus would necessarily destroy gene function. For the ethylnitrosourea-induced mutation adrK,
an Ile-->Thr exchange in codon 553 was identified. As this affects a conserved residue within a highly conserved region of
the Clc-1 gene, a functional significance of this residue is suggested. |
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ISSN: | 0021-9258 1083-351X |
DOI: | 10.1016/s0021-9258(17)37556-7 |