Is predicted to encode a protein with the following domains: Tudor domain; SNase-like, OB-fold superfamily; IRS-type PTB domain; Staphylococcal nuclease (SNase-like), OB-fold; PTB domain (IRS-1 type); and Staphylococcal nuclease homologue. Is an ortholog of C. elegans tsn-1. In C. elegans, tsn-1 is involved in miRNA-mediated post-transcriptional gene silencing.