Null allele. Mortal germline. Progressive telomere shortening due to telomerase dysfunction. Hypersensitive to DNA interstrand crosslinking agents. This strain will become sterile after propagating 10-20 generations. mrt-1 mutants can be rejuvenated by outcrossing. Reference: Meier B, et al. EMBO J. 2009 Nov 18;28(22):3549-63. [NOTE: allele is incorrectly described as e2661 in this publication.]