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. 1981 Oct 10;9(19):4813–4822. doi: 10.1093/nar/9.19.4813

An unusually long non-coding region in rat lens alpha-crystallin messenger RNA.

R J Moormann, H M van der Velden, H J Dodemont, P M Andreoli, H Bloemendal, J G Schoenmakers
PMCID: PMC327481  PMID: 6171772

Abstract

Most of the mRNA sequence coding for the alpha A2 chain of the ocular lens protein alpha-crystallin from rat, has been determined by sequencing cloned DNA copies of this mRNA. The 892-base pair cDNA sequence encompasses all but 52 N-terminal amino acids of the alpha A2 chain. It lacks the sequence characteristic for the 22 extra amino acids inserted in the alpha A2 -like chain, named alpha AIns. A stretch of 583 nuceotides, representing more than 50% of the entire mRNA sequence, is located 3' wards of the alpha A2 coding sequence. It contains the characteristic AAUAAA signal involved in poly(A) -addition and represents an unexpectedly long non-coding region. Examination of the total cytoplasmic poly(A) RNA of rat lens by filter-hybridization and subsequent translation of the electrophoretically separated mRNA fractions shows that the alpha A2 chain is encoded by mRNA species which are distinct from the alpha AIns encoding mRNA. No evidence is obtained for an extensive size heterogeneity in the 3' untranslated regions of these two different rat lens mRNAs.

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Selected References

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