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Background  Gonad differentiation is one of the most important developmental events in vertebrates. Some heat shock proteins are associated with gonad development. Heat shock protein 70 (Hsp70) in the teleost fish and its roles in sex differentiation are poorly understood.    Methods and Findings  We have identified a testis-enriched heat shock protein Hspa8b2 in the swamp eel using Western blot analysis and Mass Spectrometry (MS). Fourteen  Hsp70  family genes were further identified in this species based on transcriptome information. The phylogenetic tree of  Hsp70  family was constructed using the Maximum Likelihood method and their expression patterns in the swamp eel gonads were analyzed by reverse transcription-polymerase chain reaction (RT-PCR).    Conclusion  There are fourteen gene members in the  Hsp70  family in the swamp eel genome.  Hsp70  family, particularly  Hspa8 , has expanded in the species. One of the family members  Hspa8b2  is predominantly expressed in testis of the swamp eel.

Identification of a Testis-Enriched Heat Shock Protein and Fourteen Members of Hsp70 Family in the Swamp Eel