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Eubanks, J.H. et al.

The gene encoding the glutamate receptor subunit GluR5 is located on human chromosome 21q21.1-22.1 in the vicinity of the gene for familial amyotrophic lateral sclerosis.

Genomic clones of the human non-N-methyl-D-aspartate (non-NMDA) glutamate receptor subunit GluR5 were isolated by high-stringency screening of a cosmid library using the rat cDNA as a probe. The chromosomal localization of the human GluR5 gene has been established. Southern hybridization of DNA isolated from mapping panels of Chinese hamster-human hybrid cell lines and high-resolution in situ suppression hybridization localize the GluR5 gene to chromosome 21q21.1-22. 1. This coincides with the localization of a mutant gene causing familial amyotrophic lateral sclerosis (ALS), as Siddique et al. established by linkage analyses [Siddique, T., Figlewicz, D. A., Pericak-Vance, M. A., Haines, J. L., Rouleau, G., Jeffers, A. J., Sapp, P., Hung, W. Y., Bebout, J., McKenna-Yasek, D., Deng, G., Horvitz, H. R., Gusella, J. F., Brown, R. H. & Roses, A. D. (1991) N. Engl. J. Med. 324, 1381-1384]. Convergent evidence from other investigators suggests that chronic pathologic activation of motor neurons via non-NMDA glutamate receptors might induce excitotoxic injury of motor neurons, culminating in ALS. Together with the demonstration that GluR5 transcripts are expressed in the ventral horn of the spinal cord, the region in which susceptible motor neurons reside, the chromosomal localization suggests that a mutated GluR5 gene may be responsible for the familial form of ALS.[1]

References

The gene encoding the glutamate receptor subunit GluR5 is located on human chromosome 21q21.1-22.1 in the vicinity of the gene for familial amyotrophic lateral sclerosis. Eubanks, J.H., Puranam, R.S., Kleckner, N.W., Bettler, B., Heinemann, S.F., McNamara, J.O. Proc. Natl. Acad. Sci. U.S.A. (1993) [Pubmed]

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