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Biochem Biophys Res Commun. 1991 May 15;176(3):1239-44.

Cloning and partial nucleotide sequence of human glutamic acid decarboxylase cDNA from brain and pancreatic islets.

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  • 1Burnet Clinical Research Unit, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia.


We report partial nucleotide sequences of the human enzyme glutamic acid decarboxylase (GAD) from brain and pancreatic islets which encode the middle 180 amino acids of GAD. The brain and islet GAD sequences display a high degree of sequence homology with the equivalent region of other mammalian brain GAD cDNAs. Alignment of the brain and islet GAD sequences showed that there were 45 nucleotide differences which, at the translational level, would result in seven amino acid substitutions. These results which suggest that different isomeric forms of human GAD exist in brain and pancreas may be relevant to the pathogenesis of stiff man syndrome (SMS) and insulin-dependent diabetes mellitus (IDDM), respectively, two distinct but associated clinical disorders in which GAD is the target of autoantibodies.

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