Search Strains

Val186Glu. Null allele. Slightly cold-sensitive; dominant suppressor of unc-17(e245). Lethal with erd-2.2(RNAi). Also known as sup-2(e997). Reference: Mathews EA, et al. Genetics. 2021;218(4):iyab065. doi:10.1093/genetics/iyab0. PMID: 33914877.

crEx498 [dpy-14p::ptr-15(+) + sur-5p::GFP]. Pick animals with nuclear GFP throughout body to maintain. Lethal ptr-15 deletion allele marked with pharyngeal GFP [loxP ::myo-2p::GFP::unc-54 3’UTR + rps-27p::neoR::unc-54 3’UTR::loxP]; lethality rescued by hypodermal expression of PTR-15 form crEx498 array. Non-nuclear GFP animals (only pharyngeal expression) will be dead eggs and dead hatchlings. Derived from parental strain VC4151. References: O’Rourke et al. (in revision 2024).

Dpyish. Head abnormal. Lethal hemizygous.

Notched head. Tail abnormalities. Variable expression. Incomplete penetrance. Especially seen in L1. M-MATING++++ >30%WT. See also WBPaper00003843 and WBPaper00003865. Previously called efn-1(e96).

ep369 is a weak allele. ep6 is a deletion allele. This strain cannot be distributed to commercial organizations. This strain cannot be used for any commercial purpose or for work on human subjects.

epEx141 [sbp-1::GFP::SBP-1 + rol-6(su1006)]. ep79 is a strong allele of sbp-1 (ts lethal). sbp-1 aka pin-1. This strain cannot be distributed to commercial organizations. This strain cannot be used for any commercial purpose or for work on human subjects.

cer1 is a CRISPR-generated 368 bp deletion removing intron 2 and part of exon 3, creating a premature stop codon. Low penetrance of developmental defects such as abnormal L1 morphology, aberrant gonad migration, and an abnormal number of distal tip cells. Reference: Brena D, et al. Sci Rep. 2020 Sep 30;10(1):16153.

cer2 is a CRISPR-generated 438 bp deletion + 50 bp insertion removing intron 2 and part of exon 3, creating a premature stop codon. Low penetrance of developmental defects such as abnormal L1 morphology, aberrant gonad migration, and an abnormal number of distal tip cells. Reference: Brena D, et al. Sci Rep. 2020 Sep 30;10(1):16153.

cer9 is a CRISPR-generated 462 bp deletion at the beginning of the ikb-1 coding sequence, including the start codon (no transcript should be synthesized). Low penetrance of developmental defects such as abnormal L1 morphology, aberrant gonad migration, and an abnormal number of distal tip cells. Reference: Brena D, et al. Sci Rep. 2020 Sep 30;10(1):16153.

Reduced brood size. Genetic interaction with rpn-9. cer27 is a 1033 bp deletion removing the start codon and nearly all of the ubh-4 coding sequence. Reference: Martinez-Fernandez C, et al. Cells. 2023 Mar 18;12(6):929. doi: 10.3390/cells12060929. PMID: 36980270

Homozygous viable mutation balanced by GFP- and dpy-10-marked inversion. Heterozygotes are WT with relatively dim pharyngeal GFP signal, and segregate WT dim GFP, Dpy bright GFP (mIn1 homozygotes), and non-GFP cer140 gk401 homozygotes (synthetic sterile). Pick WT dim GFP and check for correct segregation of progeny to maintain. Generated by CRISPR-mediated deletion of ubh-4 in gk401 mutant background. Reference: Martinez-Fernandez C, et al. Cells. 2023 Mar 18;12(6):929. doi: 10.3390/cells12060929. PMID: 36980270

No obvious phenotype. comt-4(cer157) is a complete deletion of the comt-4 gene (coding sequence + introns), which was replaced by GFP::H2B (Nested CRISPR, Vicencio et al, Genetics 2019), thereby creating a null allele and a transcriptional reporter at the same time. Reference: Martínez-Fernández C, et al. Dis Model Mech. 2022 Mar 1;15(3):dmm049161. doi: 10.1242/dmm.049161. PMID: 35107130

Abnormal locomotion can be rescued with dopamine. cat-2(cer181) is a complete deletion of the cat-2 gene (coding sequence + introns), which was substituted by the sequence of the step 1 repair for GFP::H2B (Nested CRISPR, Vicencio et al, Genetics 2019). Allele can be detected using the following primers: Fwd: ctatgtgaagtcacacctgtc Rev: cttgctggaagtgtacttggtg. Reference: Martínez-Fernández C, et al. Dis Model Mech. 2022 Mar 1;15(3):dmm049161. doi: 10.1242/dmm.049161. PMID: 35107130

Superficially wild-type. tm2607 is a 196 bp deletion + 1bp insertion that removes part of an essential gene, but produces viable animals. Reference: Fontrodona L, et al. PLoS Genet. 2013 Jun;9(6):e1003543.

muEx158 [daf-16cAM::GFP + sur-5p::GFP] (AM = AKT-site mutant). Pick GFP+ worms to maintain. Sterile at 25C; grow at 20C or less. muEx158 contains GFP-tagged daf-16 c isoform (described as a1 isoform in Lin, et al. Nat Genet. 2001) with 4 Ser/Thr residues mutated to Ala, which completely rescues dauer formation and partially restores longevity of daf-16; daf-2 double mutants. Reference: Lin K, et al. Nat Genet. 2001 Jun;28(2):139-45.

muIs252 [eft-3p::wrmScarlet1-10::unc-54 3'UTR + Cbr-unc-119(+)] II. Somatic expression of wrmScarlet1-10 (under the control of the eft-3 promoter and unc-54 3'UTR). Reference: Goudeau J, et al. Genetics. 2021 Apr 15;217(4):iyab014. doi: 10.1093/genetics/iyab014. PMID: 33693628

muIs252 [eft-3p::wrmScarlet1-10::unc-54 3'UTR + Cbr-unc-119(+)] II. Homozygous viable. Endogenously-tagged wrmScarlet11::vha-13 generated via CRISPR/Cas9 insertion into parental strain CF4582. Reference: Goudeau J, et al. Genetics. 2021 Apr 15;217(4):iyab014. doi: 10.1093/genetics/iyab014. PMID: 33693628

muIs253 [eft-3p::sfGFP1-10::unc-54 3'UTR + Cbr-unc-119(+)] II. muIs252 [eft-3p::wrmScarlet1-10::unc-54 3'UTR + Cbr-unc-119(+)] II. Somatic expression of sfGFP1-10 and wrmScarlet1-10 (both under the control of the eft-3 promoter and the unc-54 3'UTR). [NOTE: A low level of "leaky" GFP expression from sfGFP1-10 is detected at high magnifications.] Reference: Goudeau J, et al. Genetics. 2021 Apr 15;217(4):iyab014. doi: 10.1093/genetics/iyab014. PMID: 33693628

muIs252 [eft-3p::wrmScarlet1-10::unc-54 3'UTR + Cbr-unc-119(+)] II. Homozygous viable. Endogenously-tagged his-3::wrmScarlet11 generated via CRISPR/Cas9 insertion into parental strain CF4582. Reference: Goudeau J, et al. Genetics. 2021 Apr 15;217(4):iyab014. doi: 10.1093/genetics/iyab014. PMID: 33693628

muIs252 [eft-3p::wrmScarlet1-10::unc-54 3'UTR + Cbr-unc-119(+)] II. Homozygous viable. Endogenously-tagged wrmScarlet11::linker::fib-1 generated via CRISPR/Cas9 insertion into parental strain CF4582. Reference: Goudeau J, et al. Genetics. 2021 Apr 15;217(4):iyab014. doi: 10.1093/genetics/iyab014. PMID: 33693628

muIs252 [eft-3p::wrmScarlet1-10::unc-54 3'UTR + Cbr-unc-119(+)] II. Homozygous viable. Endogenously-tagged his-3::wrmScarlet11(x3) generated via CRISPR/Cas9 insertion of three wrmScarlet11 tags into the endogenous his-3 locus in parental strain CF4582. Reference: Goudeau J, et al. Genetics. 2021 Apr 15;217(4):iyab014. doi: 10.1093/genetics/iyab014. PMID: 33693628

muIs257 [myo-3p::wrmScarlet1-10::unc-54 3'UTR] I. Muscle-specific expression of wrmScarlet1-10 (Under the control of the myo-3 promoter and unc-54 3'UTR). Generated using CRISPR/Cas9 in the SKI-LODGE strain WBM1126. Reference: Goudeau J, et al. bioRxiv 2020.07.02.185249; doi: https://doi.org/10.1101/2020.07.02.185249

muIs257 [myo-3p::wrmScarlet1-10::unc-54 3'UTR] I. Homozygous viable. Endogenously-tagged wrmScarlet11::linker::fib-1 generated via CRISPR/Cas9 insertion into parental strain CF4610. Reference: Goudeau J, et al. Genetics. 2021 Apr 15;217(4):iyab014. doi: 10.1093/genetics/iyab014. PMID: 33693628

muIs252 [eft-3p::wrmScarlet1-10::unc-54 3'UTR + Cbr-unc-119(+)] II. split-wrmScarlet11 inserted at the N-terminus of the endogenous tbb-2 locus; detectable in all somatic tissues where wrmScarlet1-10 is present. Figure 3B from Goudeau et al., Genetics 2021. Reference: Goudeau J, et al. Genetics. 2021 Apr; 217(4): iyab014. PMID: 33693628.

muIs252 [eft-3p::wrmScarlet1-10::unc-54 3'UTR + Cbr-unc-119(+)] II. Two tandem repeats of split-wrmScarlet11 inserted at the N-terminus of the endogenous VHA-13 locus; detectable in somatic tissues where wrmScarlet1-10 is present. Figure 4A from Goudeau et al., Genetics 2021. Reference: Goudeau J, et al. Genetics. 2021 Apr; 217(4): iyab014. PMID: 33693628.

muIs252 [eft-3p::wrmScarlet1-10::unc-54 3'UTR + Cbr-unc-119(+)] II. split-wrmScarlet11(MDELYK) inserted at the C-terminus of the endogenous TOMM-20 locus; detectable in somatic tissues where wrmScarlet1-10 is present. Figure S6B from Goudeau et al., Genetics 2021. Reference: Goudeau J, et al. Genetics. 2021 Apr; 217(4): iyab014. PMID: 33693628.

muIs252 [eft-3p::wrmScarlet1-10::unc-54 3'UTR + Cbr-unc-119(+)] II. split-wrmScarlet11(MDELYK) inserted at the C-terminus of the endogenous HIS-3 locus; detectable in somatic tissues where wrmScarlet1-10 is present. Figure S6A from Goudeau et al., Genetics 2021. Reference: Goudeau J, et al. Genetics. 2021 Apr; 217(4): iyab014. PMID: 33693628.

QR descendants fail to migrate anteriorly with 100% penetrance. BDUL/R fail to migrate anteriorly (incomplete penetrance).

Slow growing (4 to 7 days from L1 to adult), sluggish movement, egg-laying defective, short lifespan (~5 to 6 days adult lifespan); male mating impotent. sdha-1(rg550) is viable and likely a partial loss-of-function allele; the sdha-1(ok1908) deletion is lethal. sdha-1(rg550) is a CRISPR/Cas9 + oligo-induced gene conversion into the sdha-1 gene recapitulating a G214E substitution originally identified in an EMS mutant screen. The lesion was recreated via CRISPR/Cas9 in N2 to ensure the mutation/phenotype was not linked to other background mutations induced during mutatgenesis. rg551 is an endogenous genomic CRISPR/Cas9 knock in of YFP fused to the C-terminus of the gene pck-2 in N2 background. YFP fluorescence body wall muscle, intestine, hypodermis and pharyngeal muscle. Him. Reference: Goncalves J, et al. iScience 2020 Mar 19;23(4):100990. PMID: 32240955

CGC1 (formerly known as PD1074) is intended to be used as a wild-type reference strain with the closely matched genome assembly of Yoshimura, et al. (Genome Res. 2019 Jun;29(6):1009-1022) available on Wormbase as VC2010-1.0. (ENA study accession PRJEB28388; assembly accession GCA_900538205). CGC1 is a defined and recently cloned population of animals derived from the original "Bristol" variant of C. elegans originally obtained by Brenner from E. Dougherty with no known history of mutagenesis. Brenner's original population, called N2, was used as the basis for the vast majority of laboratory strains in use currently. No early frozen stock of the unmutagenized N2 population currently exists, but later stocks were available from several laboratories. CGC1 is a clonal population founded by picking a single worm of one such stock, VC3510. VC3510 in turn derives from a subpopulation of N2 described in the literature as VC2010. We note that CGC1 is expected to be largely similar to most lab N2 strains, but that as a clonal isolate derived from N2, there will be some loci that will vary compared to any other particular N2 isolate. One such example is a partial deletion of the alh-2 locus in CGC1. Additional loci that were found to vary between the prior N2 reference genome (WormBase release WS264) and the VC2010-1.0 assembly are detailed in supplemental table 8 in Yoshimura, et al, (2019). For whole-genome sequence-verified wild strains, please request from the Caenorhabditis Natural Diversity Resource (www.caendr.org).

This strain is difficult and time consuming to maintain. Gives relatively few heterozygotes. Homozygous lethal mutation balanced by Dpy- and myo-2p::Venus-marked inversion. Heterozygotes are paralyzed Unc and Egl with relatively dim pharyngeal GFP (Venus) expression. Heterozygotes segregate heterozygous non-Dpy GFP+ paralyzed Unc and Egl, non-GFP embryonic lethal (homozygous n499), and Dpy with brighter GFP+ (tmC20 homozygous). Remove Dpy from plate to prevent them from taking over. Heterozygotes tend to stack up in parallel clumps. Populations can be enriched by transferring these clumps to new plates and allowing Dpy (tmC20 homozygotes) to crawl out into bacterial lawn, and then picking away Dpy or transferring the clump of Hets to another plate. Derived by balancing n499 from parental strain MT1102 over tmC20 from FX30179.

Deletion of mir-788 pre-miRNA via CRISPR/CAS9 and CRE/lox. Left Flanking: TCTGTGCGTATTACAAATTTTCAGCTGGAA, Right Flanking: GAATAGCAGTTTTCAAAATTGTGAGTTGCT. sgRNA: CTGCAAATGGAAGTTAGAAG.

Deletion of mir-799 pre-miRNA via CRISPR/CAS9 and CRE/lox. Left Flanking: ATTTTCTATTTATTGGTATAAAATATGTTA, Right Flanking: AAGAAGTACACTTCATATGCTCCTAACAAT. sgRNA: GTGAACCCTGATAAAGCTAG.

umnIs33 [myo-2p::GFP + NeoR, II: 11755713 (intergenic)] II. Deletion of lin-4 pre-miRNA via CRISPR/CAS9. Heterozygotes are wild-type GFP+, and segregate wild-type GFP+, Lin-4 non-GFP (umn82 homozygotes), and Dpy GFP+ (mIn1 homozygotes). Maintain by picking wild-type GFP+. Left Flanking: AGAGTTTTGGTTGGTTTATGAGTTT, Right Flanking: CCAGGACGGTTTGAGCAGATCtttt. sgRNA: TGAGGTCTCAGGGAACAGGC.

umnIs33 [myo-2p::GFP + NeoR, II: 11755713 (intergenic)] II. Deletion of lin-4 pre-miRNA via CRISPR/CAS9. Heterozygotes are wild-type GFP+, and segregate wild-type GFP+, Lin-4 non-GFP (umn85 homozygotes), and Dpy GFP+ (mIn1 homozygotes). Maintain by picking wild-type GFP+. Left Flanking: AGAGTTTTGGTTGGTTTATGAGTTT, Right Flanking: CCAGGACGGTTTGAGCAGATCtttt. sgRNA: TGAGGTCTCAGGGAACAGGC.

Deletion of mir-82 pre-miRNA via CRISPR/CAS9 and CRE/lox. Left Flanking: TATCATTCTCTCTACTACTAGTGAACTCAT, Right Flanking: TTATCAAGAAAATTCAAGAAAATTCAAAAG. sgRNA: CTGTAGATCACAGAGAAAAC.

Lethal/sterile dpy-26 allele balanced over tmC5 labelled with Venus. Heterozygotes are wild-type with somewhat dimmer Venus signal and segregate WT Venus(+) heterozygotes, Mec Unc Venus(+) tmC5 homozygotes, and non-Venus n199 homozygotes (variable morphology). Pick wild-type Venus(+) and check for proper segregation of progeny to maintain. Derived by crossing parental strains FX30140 with CB5101 (males).

umnIs25 [myo-2p::GFP + NeoR, X: 15420938 (intergenic)]. Pick wild-type GFP+ to maintain. Segregates lethals: homozygous Dp/Dp are lethal. Derived by insertion of myo-2p::GFP transgene into mnDp1 duplication in parental strain SP219 using CRISPR/Cas9.

Homozygous viable. Deletion of 745 bp with Calarco/Colaiacovo selection cassette conferring myo-2::GFP and G418 resistance inserted at break in parental strain N2. Left flanking Sequence: tgtacccccgatgggattcgaacctgtggc ; Right flanking sequence: gggtatgcaaaatgaccgcgttttctgtga. Please reference Au et al., G3 9(1): 135-144 2019 in any work resulting from use of this mutation.

Homozygous viable. Deletion of 1004 bp with Calarco/Colaiacovo selection cassette conferring myo-2 GFP and G418 resistance inserted at break in parental strain N2. Left flanking Sequence: ttgttctggtttaaagccgcaaagtcttgg ; Right flanking sequence: agggtaccatcaagcaatggcattctggtt. Please reference Au et al., G3 9(1): 135-144 2019 in any work resulting from use of this mutation.

Homozygous viable. Deletion of 917 bp with Calarco/Colaiacovo selection cassette conferring myo-2 GFP and G418 resistance inserted at break in parental strain N2. Left flanking Sequence: CATGTACTCCCCTATATCTTCCAAACATTC ; Right flanking sequence: TGGACATCTTGGAGCACTTTCTGTGATTCT. Please reference Au et al., G3 9(1): 135-144 2019 in any work resulting from use of this mutation.

Homozygous viable. Deletion of 280 bp with Calarco/Colaiacovo selection cassette conferring myo-2 GFP and G418 resistance inserted at break in parental strain N2. Left flanking Sequence: AAGGCGTCATCTGGAGAGAAGAACGAAgtg ; Right flanking sequence: CGGACACTTGTGCTTCACCAACTTGATCGC. Please reference Au et al., G3 9(1): 135-144 2019 in any work resulting from use of this mutation.

Homozygous viable. Deletion of 842 bp with Calarco/Colaiacovo selection cassette conferring myo-2 GFP and G418 resistance inserted at break in parental strain N2. Left flanking Sequence: TATTTGGTATCATTTTTCTAGCCGACTTTC ; Right flanking sequence: TGGACTTGTTTTCACTCATCCCTGTACCGA. Please reference Au et al., G3 9(1): 135-144 2019 in any work resulting from use of this mutation.

Superficially wild-type. CRISPR/Cas9 deletion of C09F12.3. myo-2p::GFP + NeoR cassette is still present but may be excised using LoxP sites.

Homozygous viable. Deletion of 1123 bp with Calarco/Colaiacovo selection cassette conferring myo-2 GFP and G418 resistance inserted at break in parental strain N2. Left flanking Sequence: aaaaatcaactatttttaatgaaaatttca ; Right flanking sequence: TGGTCACTTTACCTGCGTTGATATTCATGT. Please reference Au et al., G3 9(1): 135-144 2019 in any work resulting from use of this mutation.

Homozgous viable. Deletion of 1171 bp with Calarco/Colaiacovo selection cassette conferring myo-2 GFP and G418 resistance inserted at break in parental strain N2. Left flanking Sequence: acaatttacattaacttttcattatttcag ; Right flanking sequence: tggatgtgcattttttcgctgctcactctt. Please reference Au et al., G3 9(1): 135-144 2019 in any work resulting from use of this mutation.

Viable and fertile. Deletion of 664 bp, molecular null.

Heterozygotes are WT and segregate WT, Dpy Steriles and 3-fold lethals. cg46 is a 497 bp deletion that removes the last 22 nucleotides of intron 9 and 475 nucleotides of exon 10;

Parental strain was CH1416 mut-2(r459) I; nid-1(ev608) V. Tc1 excision deletion of nid-1 was identified. In frame deletion, removes amino acids Thr53-Gln693 of NID-1. Homozygous viable and fertile, slightly reduced fertility. mut-2 was removed by outcrossing. nid-1=F54F3.1. Received new stock 1/2004 from Jim Kramer.

Parental strain was CH1416 mut-2(r459) I; nid-1(ev608) V. Tc1 excision deletion of nid-1 was identified. Molecular null, deletion removes promoter region. Homozygous viable and fertile, fecundity reduced by approximately 30%. nid-1=F54F3.1.