Alternative splicing of the glutamate transporter EAAT2 (GLT-1).

The human glutamate transporter EAAT2 (GLT-1) is of major importance for synaptic glutamate reuptake, and reportedly, a candidate gene for neurodegenerative diseases such as amyotrophic lateral sclerosis, Alzheimer's disease and epilepsy. Here we report the polymerase chain reaction (PCR) cloning of two novel EAAT2 transcripts, named EAAT2-C1 and EAAT2-C2, which originate from alternative splicing of the human EAAT2 gene. EAAT2-C1 results from skipping of the protein coding exon eight. In contrast, EAAT2-C2 is characterized by usage of internal splice sites in the exons five and six. The splicing events lead to a deletion of 45 and 107 amino acids, respectively, located in the C-terminal and central part of the putative protein.