Promotes the exosome-mediated degradation of mRNAs containing a DSR (determinant of selective removal) signal sequence from mitotic cells. Interacts with mmi1, pla1 and rrp6. Localizes to distinct foci in the nucleus in mitotic cells, which disassemble during meiosis, although the protein is still present. Cold sensitive (PubMed:26942678). Decreases degradation of mRNA containing a DSR (determinant of selective removal) region (PubMed:26942678). Abnormal meiRNA nuclear dot formation in zygote (PubMed:26942678). meiRNA dot formation in haploid cells (PubMed:26942678).