Differential RNA cleavage and polyadenylation of the glutamate transporter EAAT2 in the human brain

We cloned four novel transcripts of the excitatory amino acid transporter 2, named EAAT2/3UT1-4, resulting from differential cleavage and polyadenylation. Tandem poly (A) sites were found to be functional at 72, 654, 973 nucleotides and more than 2 kb downstream of the stop codon. A tissue-specific expression was identified for 3'-variants of the EAAT2 RNA, most prominently for EAAT2/3UT4 (hippocampus > cortex >> cerebellum > thalamus) as demonstrated by Northern blot analysis and quantitative PCR. We conclude, that alternative poly (A) selection may contribute to the reported differential EAAT2 protein expression under normal and diseased conditions. (C) 2000 Elsevier Science B.V.