May act in meiotic drive. Localizes to the endoplasmic reticulum in both vegetative cells and in spores. Expression is constant during meiosis (at protein level). Simultaneous knockout of wtf15 results in normal vegetative cell population growth (PubMed:32032353). Simultaneous knockout of wtf15, wtf11 and wtf7 results in normal spore viability (PubMed:32032353). Although the gene is capable of encoding two isoforms, RNA sequencing data show no evidence of alternative transcripts. Belongs to the WTF family.