Abstract
In order to investigate suggestions that more than one glutamate dehydrogenase (GDH) gene may be active in humans, seven human brain and seventeen human liver GDH cDNAs were isolated by probing with a 590 base cDNA from the coding region of human brain GDH. No sequence heterogeneity was revealed among any of the cDNAs by an oligonucleotide binding assay, nor did any cDNA appear to encode a hexapeptide contained in a published amino acid sequence of human liver GDH. Homologous regions of three liver and three brain cDNAs had identical sequences over more than 2 kb, including 3′ nontranslated regions. This suggests that identical GDH mRNAs are present in human brain and human liver. Although only one gene appears to be expressed, human genomic DNA blots show a pattern of hybridization consistent with the existence of more than one GDH gene.
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