xnIs461 [sec-5::YFP + unc-119(+)]. Expresses sec-5::YFP maternally and zygotically. Expression is present in many cells, including early embryos, epithelial cells, the excretory cell, and the germ line. Rescues maternal-effect lethality of sec-5(pk2358). Reference: Armenti ST, Chan E, Nance J. Dev Biol. 2014 Aug 4. pii: S0012-1606(14)00355-8.

sec-5(xn51 [sec-5::zf1::YFP + LoxP::unc-119::LoxP]) II. Knock-in of zf1::yfp and unc-119(+) into the sec-5 locus. Expresses SEC-5::ZF1::YFP maternally and zygotically. Expression in many cells, including early embryos, epithelial cells, excretory cell, and germ line. unc-119 is present in reverse orientation within an intron of YFP. Reference: Armenti ST, et al. Development 2014 (in press).

Heterozygotes segregate wild-type heterozygotes, Dpy, and sec-5 homozygotes (scrawny, small broods, abnormal gut appearance) sec-5 is homozygous maternal-effect lethal; M+Z- animals produce a few dead L1-L2 stage larvae with Vab defects. Based upon phenotype, pk2357 is a strong loss-of-function, but likely not a null allele; molecular lesion produces a premature stop at position 389. Reference: Frische EW, et al. EMBO J. 2007 Dec 12;26(24):5083-92. [NOTE: This strain was previously described as carrying pk2358, but pk2357 is the correct allele. Both pk2357 and pk2358 cause the same nonsense (amber) change.]

Heterozygotes segregate wild-type GFP+ heterozygotes, GFP+ Dpy, and sec-5 homozygotes (scrawny, small broods, abnormal gut appearance) sec-5 is homozygous maternal-effect lethal; M+Z- animals produce a few dead L1-L2 stage larvae with Vab defects. Pick GFP+ wild-type to maintain. Based upon phenotype, pk2357 is a strong loss-of-function, but likely not a null allele; molecular lesion produces a premature stop at position 389. Reference: Frische EW, et al. EMBO J. 2007 Dec 12;26(24):5083-92. [NOTE: This strain was previously described as carrying pk2358, but pk2357 is the correct allele. Both pk2357 and pk2358 cause the same nonsense (amber) change.]

Heterozygotes are WT and segregate WT, DpyUncs, and Unc-4 animals which arrest at the L4 stage. Rarely, a recombination will occur and unc-4 and pir-1 will become unlinked. Propagate the strain by picking single WT animals and checking for correct segregation of progeny. 6/2007: Daniel Chavez notes that tm1496 may also delete part of sec-5, which could be responsible for the developmental arrest of tm1496.