PMID: 10931484Aug 10, 2000

Domain-restricted expression of two glutamic acid decarboxylase genes in midgestation mouse embryos

The Journal of Comparative Neurology
Zoya D KatarovaG Szabó


Glutamic acid decarboxylase (GAD) is the biosynthetic enzyme for gamma-aminobutyric acid (GABA), the major inhibitory neurotransmitter in the central nervous system (CNS) of vertebrates. In addition to the adult CNS, GABA and GAD also have been detected in embryos, although their precise localization and specific functions in embryonic development have not been elucidated. In this paper, the authors studied the cellular distribution of two GAD isoforms, GAD65 and GAD67, in midgestation mouse embryos by in situ hybridization histochemistry. With few exceptions, it was found that GAD65 and GAD67 mRNAs are localized in overlapping cellular domains of the embryonic CNS that later develop into regions with a strong GABAergic contribution. The GAD-expressing cells are situated in the differentiating zone of the embryonic day 10.5 (E10.5) through E11.5 CNS and in the subventricular zone and the mantle zone of the E12.5 CNS, which suggests that they are committed neuronal precursors. By using a specific serum for GABA, a similar pattern of distribution was obtained, indicating that GAD mRNAs are translated efficiently into enzymatically active GAD, which produces embryonic GABA. The expression domains of GAD overlap with those of genes...Continue Reading


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Related Concepts

Establishment and Maintenance of Localization
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