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Aims  To explore effect of Ca 2+  and Cd 2+  on the calmodulin (CaM), one complete cDNA sequence (AwCaM1) was cloned and characterized from the freshwater mussel  Anodonta woodiana  and its expressions were analyzed.    Materials and methods  The AwCaM1 was cloned from the  A. woodiana  using the rapid amplification of cDNA ends methods and its expression was determined by real-time PCR.    Results  In the hepatopancreas, AwCaM1 expression was up-regulated with a time and dose dependent pattern in the Ca 2+  treated groups (0.01, 0.02, 0.04 and 0.08 mg/L) during experiment observed, and increased more than 56.15% (p&lt;0.05) compared with that of control group. AwCaM1 mRNA level increased more 65.04% (p&lt;0.05) in the Cd 2+  treated groups (8 and 16 mg/L). In the gill, AwCaM1 expression increased more than 79.41% (p&lt;0.05) compared with that of control group in all the Ca 2+  treated groups, and more than 88.23% (p&lt;0.05) in all the Cd 2+  treated groups.    Conclusion  These results indicated that up-regulations of AwCaM1 expression in bivalve  A. woodiana  are associated with Ca 2+  absorb and environmental adaption derived from Ca 2+  and Cd 2+  treatment.

Characterization of calmodulin in the clam Anodonta woodiana : differential expressions in response to environmental Ca 2+ and Cd 2+