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Background  Heat stress proteins are implicated in stabilizing and refolding denatured proteins in vertebrates and invertebrates. Members of the Hsp70 gene family comprise the cognate heat shock protein (Hsc70) and inducible heat shock protein (Hsp70). However, the cDNA sequence and the expression of Hsp70 in the Antarctic sea urchin are unknown.    Methods  We amplified and cloned a transcript sequence of 1991 bp from the Antarctic sea urchin  Sterechinus neumayeri , experimentally exposed to heat stress (5  and 10 °C for 1, 24 and 48 h). RACE-PCR and qPCR were employed to determine Hsp70 gene expression, while western blot and ELISA methods were used to determine protein expression.    Results  The sequence obtained from  S. neumayeri  showed high identity with Hsp70 members. Several Hsp70 family features were identified in the deduced amino acid sequence and they indicate that the isolated Hsp70 is related to the cognate heat shock protein type. The corresponding 70 kDa protein, called  Sn -Hsp70, was immune detected in the coelomocytes and the digestive tract of  S. neumayeri  using a monospecific polyclonal antibody. We showed that  S. neumayeri  do not respond to acute heat stress by up-regulation of  Sn -Hsp70 at transcript and protein level. Furthermore, the  Sn -Hsp70 protein expression was not induced in the digestive tract.    Conclusions  Our results provide the first molecular evidence that  Sn -Hsp70 is expressed constitutively and is non-induced by heat stress in  S. neumayeri .

HSP70 from the Antarctic sea urchin Sterechinus neumayeri: molecular characterization and expression in response to heat stress