||Temperature sensitive. At 22.5C, maternal effect embryonic lethal. Temperature shift-up to 22.5C during embryogenesis results in animals with Egl, Pvul and Psa (phasmid socket absent) phenotypes. Shift-up to 25C results in growth arrest at larval stage. The T cell division can be symmetric as in lin-17 mutants. At 15C, nearly WT. Males grown at 15C can mate very well. psa-1 encodes a homolog of yeast SW13, a component of the SWI/SNF complex. Sequence data of this strain revealed the mutation is actually GTC/CCC/TCA to GTC/CTC/TCA causing a P86L substitution (G. Hayes).
||Synthetic lethal with lin-35(n745). Temperature sensitive.
||Heterozygotes are mostly wild-type but occasionally lack a gonad arm; segregate tm4567 homozygotes (larval/embryonic lethal) and rol-9 homozygotes (Rol). Pick non-Rol to maintain and screen for larval lethals (or by PCR) for tm4567 deletion. Reference: Large EE and Mathies LD (2014 Jan 8). G3, doi: 10.1534/g3.113.009852.
||unc-119(ed3) III; heIs105 IV; swsn-1(os22) heSi164 V; heSi141 X.
||heIs105 [rps-27::loxP::NLS::mCherry::let858 UTR::loxP::NLS::GFP::let-858 UTR + unc-119(+)] IV. heSi164 [rps-27::loxN::NLS::mCherry::let858 UTR::swsn-1p::swsn-1::unc-54 UTR::loxN::NLS::GFP::let-858 UTR + unc-119(+)] V. heSi141 [hlh-8(short)::FLAG::CRE::tbb-2 + unc-119(+)] X. Maintain the line at 15C and shift to 25C for mutant analysis. Expression of CRE recombinase in the mesoblast lineage driven by the hlh-8 promoter. heSi164 carries a swsn-1 rescue construct which ensures rescue of the temperature-sensitive swsn-1(os22) mutation. Upon expression of CRE (in this case in the mesoblast lineage) the swsn-1 gene will be excised, creating a mesoblast specific mutant of swsn-1. This recombination event can be visualized by a switch from red to green in those mesoblast cells in which swsn-1 was lost. The animals are healthy at 15C, but embryonic lethal and larval arrested at 23-25C. swsn-1(os22) causes mild overproliferation in the mesoblast lineage. The swsn-1 rescuing transgene is unable to rescue germline development of swsn-1(os22) mutants. Reference: Ruijtenberg S & van den Heuvel S. Cell. 2015 Jul 16;162(2):300-13.
||swsn-1(gk5532[loxP + myo-2p::GFP::unc-54 3' UTR + rps-27p::neoR::unc-54 3' UTR + loxP])/+ V.
||Apparent homozygous lethal or sterile deletion as unbalanced heterozygote. Deletion of 5447 bp with Calarco/Colaiacovo selection cassette conferring myo-2 GFP and G418 resistance inserted at break. Pick viable fertile GFP+ animals to maintain. Left flanking sequence: AGCCGGAAGAGCTCCAGAGCTTGTCATCCG. Right flanking sequence: GGTGGCGGAGCAACAGGAGCCGGCCGAGCA. Please reference Au et al., G3 9(1): 135-144 2019 in any work resulting from use of this mutation.