cDNA cloning and cadmium-induced expression of metallothionein mRNA in the zebra musselDreissena polymorpha
- 28 July 1999
- journal article
- Published by Canadian Science Publishing in Biochemistry and Cell Biology
- Vol. 77 (3), 237-241
- https://doi.org/10.1139/o99-026
Abstract
Using pooled degenerate oligonucleotides inferred from the N-terminal amino acid sequence of Dreissena polymorpha metallothionein and a Cys-X-Cys motif characteristic for known metallothioneins, a 150-bp metallothionein-specific reverse transcription PCR product was generated. The PCR product was used to screen a Dreissena polymorpha cDNA library, and a complete metallothionein cDNA sequence from Dreissena was identified. Four clones with the identical sequence were detected, supporting the idea of a single metallothionein gene in Dreissena. The sequence contains a 141-bp 5prime untranslated region and a 572-bp 3prime untranslated region with two polyadenylation signals. The coding region spans 219 bp. The deduced amino acid sequence shows 21 cysteine residues present in the metallothionein-typical motifs. Induction studies were performed with 50 µg Cd2+/L for up to 16 days. The exposed mussels show a sevenfold higher metallothionein mRNA level compared with uninduced control mussels.Key words: metallothionein, Dreissena polymorpha, cadmium, induction, mRNA.Keywords
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