Regulates microtubule dynamics in Sertoli cells, a process that is essential for spermiogenesis and male fertility. Severs microtubules in an ATP-dependent manner, promoting rapid reorganization of cellular microtubule arrays (By similarity). Has microtubule- severing activity in vitro (PubMed:26929214). . This is the function of KATNAL1 (katanin catalytic subunit A1 like 1, Ensembl gene identifier ENSG00000102781).