Laboratory Information

NameSSM View on WormBase
Allele designationiow
HeadSarit Smolikov
InstitutionUniversity of Iowa, Iowa City, IA
Address University of Iowa
143 Biology Building
129 E. Jefferson St
Iowa City 52242
United States
Website http://www.biology.uiowa.edu/smolikove/
Gene classes akir 

Strains contributed by this laboratory

Strain Genotype Species Description
3XFLAG::ubc-9 3XFLAG::ubc-9 IV/nT1[qIs51] (IV;V) C. elegans Homozygous 3XFLAG:ubc-9 worms results in a developmental defect and larval arrest. Therefore, FLAG tagged worms are balanced with nT1. Heterozygous worms develop normally and are GFP+. Homozygous GFP- worms also develop normally and have WT gonads. RAD-51 staining within the gonad is normal, and FLAG staining shows perinuclear localization indicating 3XFLAG::ubc-9 is functional in the germline.
SSM2 mre-11(iow1)/nT1[qIs51] (IV;V). C. elegans Heterozygotes are wild-type with pharyngeal GFP signal, and segregate wild-type GFP, arrested nT1[qIs51] aneuploids, and non-GFP iow1 homozygotes (viable; see note below). Homozygous nT1[qIs51] inviable. Pick wild-type GFP and check for correct segregation of progeny to maintain. iow1 is a separation-of-function allele of mre-11. Homozygotes develop into adults wild-type in appearance, but laying dead eggs due to defects in meiotic DSB repair: mre-11(iow1) worms form meiotic DSBs but are impaired in their resection. Pick GFP+ to maintain (mre-11(iow1)/nT1[qIs51]) and GFP- to obtain homozygous mre-11(iow1) worms for analysis. Reference: Yin Y & Smolikove S. Mol Cell Biol. 2013 Jul;33(14):2732-47. doi: 10.1128/MCB.00055-13. Epub 2013 May 13. Erratum in: Mol Cell Biol. 2015 Jul;35(14):2568. PubMed PMID: 23671188; PubMed Central PMCID: PMC3700128.
SSM264 rad-51(iow53[GFP::rad-51])/nT1[qIs51] (IV;V). C. elegans Heterozygotes are wild-type with pharyngeal-expressed GFP, and segregate wild-type GFP+(pharynx) heterozygotes, arrested nT1[qIs51] homozygotes, and viable non-GFP(pharynx) rad-51(iow53[GFP::rad-51]) homozygotes. Balancer is prone to breaking down. If a population contains a mix of bright and dim GFP animals, pick dim GFP and check for correct segregation of progeny to maintain. iow53 inserted a GFP tag at the N-terminus of the endogenous rad-51 locus, but the tagged protein is not fully functional. non-GFP(pharynx) rad-51(iow53[GFP::rad-51]) homozygotes form GFP foci in the germline that are mostly spo-11 dependent, and GFP::rad-51 homozygotes have defects in unloading RAD-51. Created by CRISPR using pDD282, therefore may also contain 3XFLAG. Reference: Koury E, et al. Nucleic Acids Res. 2018 Jan 25;46(2):748-764.
SSM289 mre-11(iow45[mre-11::gfp::3xflag]) V. C. elegans Homozygous gfp and 3xflag C’ terminal tag inserting just before the STOP codon of mre-11. The strain is fertile and contains wild type germline (examined by DAPI). GFP is expressed in all germline nuclei. Maintain the strain by picking worms at 20C, no selection required. gfp::3xflag was added by CRISPR/Cas9 using pDD282-based vector. Reference: Reichman R, et al. Genetics. 2018 Apr;208(4):1421-1441.
SSM291 ubc-9(iow31[3xFLAG::ubc-9]) IV/nT1[qIs51] (IV;V). C. elegans Heterozygotes are wild-type with pharyngeal-expressed GFP, and segregate wild-type GFP+ heterozygotes, arrested nT1[qIs51] homozygotes, and viable non-GFP ubc-9(iow31[3xFLAG::ubc-9]) homozygotes. ubc-9(iow31[3xFLAG::ubc-9]) homozygotes produce 100% dead embryos, but cytologically they have normal germline (examined by DAPI and RAD-51 staining), suggesting that 3xFLAG::ubc-9 is functional in the gonad but not in the non-maternally rescued embryo. Maintain the strain by picking GFP+ worms and check for fertile non-GFP (which would indicate balancer has broken down). 3XFLAG added by CRISPR/Cas9. Synonymous point mutation where included in the repair template (positions 30, 33 and 36 of coding sequence). Reference: Reichman R, et al. Genetics. 2018 Apr;208(4):1421-1441.
SSM343 rpa-4(iow21) I. C. elegans rpa-4(iow21) deletion generated by CRISPR in N2 background. Reference: Hefel et al., Nucleic Acids Res. 2021 Jan 21;gkaa1293. doi: 10.1093/nar/gkaa1293.
SSM352 rpa-2(ok1627) rpa-4(iow24) I/hT2 [bli-4(e937) let-?(q782) qIs48] (I;III). C. elegans Homozygous sterile double mutant balanced by bli-4- and GFP-marked translocation. Heterozygotes are wild-type with pharyngeal GFP signal, and segregate wild-type GFP heterozygotes, arrested hT2 aneuploids, and non-GFP ok1627 homozygotes. Homozygous hT2[bli-4 let-? qIs48] inviable. Pick wild-type GFP and check for correct segregation of progeny to maintain. rpa-4(iow24) deletion generated by CRISPR/Cas9 in the rpa-2(ok1627) mutant background. Reference: Hefel et al., Nucleic Acids Res. 2021 Jan 21;gkaa1293. doi: 10.1093/nar/gkaa1293.
SSM387 rpa-2(iow49[3xFLAG::rpa-2]) I. C. elegans N-terminal 3xFLAG tag inserted into the endogenous rpa-2 locus using Crispr/Cas9. Generated in N2 background. Reference: Hefel et al., Nucleic Acids Res. 2021 Jan 21;gkaa1293. doi: 10.1093/nar/gkaa1293.
SSM410 rpa-2(ok1627) rpa-4(iow59[3xFLAG::rpa-4])I/hT2 [bli-4(e937) let-?(q782) qIs48] (I;III). C. elegans N-terminal 3xFLAG tag inserted into the endogenous rpa-4 locus using Crispr/Cas9. Homozygous sterile deletion balanced by bli-4- and GFP-marked translocation. Heterozygotes are wild-type with pharyngeal GFP signal, and segregate wild-type GFP heterozygotes, arrested hT2 aneuploids, and non-GFP ok1627 homozygotes. Homozygous hT2[bli-4 let-? qIs48] inviable. Pick wild-type GFP and check for correct segregation of progeny to maintain. Generated in rpa-2(ok1627) background. Reference: Hefel et al., Nucleic Acids Res. 2021 Jan 21;gkaa1293. doi: 10.1093/nar/gkaa1293.
SSM42 let-92(ok1537) IV/nT1 [qIs51] (IV;V). C. elegans Homozygous lethal deletion chromosome balanced by GFP-marked translocation. Heterozygotes are WT with pharyngeal GFP signal, and segregate WT GFP, arrested nT1[qIs51] aneuploids, and non-GFP gk526 homozygotes (variable arrest, early larval). Homozygous nT1[qIs51] inviable. Pick WT GFP and check for correct segregation of progeny to maintain.
SSM471 iowSi8 II; unc-119(ed3) III. C. elegans iowSi8 [pie-1p::GFP(1-10)::him-3 3’UTR + Cbr-unc119(+)] II. Germline-specific split-GFP construct. If germline silencing occurs, transgene expression can be recovered by growing worms at 25°C for 2 generations. iowSi8 was generated by MosSCI insertion into Chr II ttTi5605 in parental strain EG6699. Reference: Hefel A & Smolikove S. G3. 2019 Jun 5;9(6):1933-1943. PMID: 30992318.
SSM472 akir-1(iow88[GFP11::akir-1]) I; iowSi8 II; unc-119(ed3) III. C. eleagns akir-1(iow88[GFP11::akir-1]) I. iowSi8[pie-1p::GFP(1-10)::him-3 3UTR + Cbr-unc119(+)] II. CRISPR/Cas9 insertion of GFP11 tag into endogenous akir-1 locus in background strain SSM471. GFP::AKIR-1 fluorescence only observed in the germline. If germline silencing occurs, transgene expression can be recovered by growing worms at 25C for 2 generations. Reference: Hefel A & Smolikove S. G3. 2019 Jun 5;9(6):1933-1943. PMID: 30992318.
SSM473 rpa-1(iow89[GFP11::rpa-1]) II; iowSi8 II; unc-119(ed3) III. C. elegans rpa-1(iow89[GFP11::rpa-1]) II. iowSi8 [pie-1p::GFP(1-10)::him-3 3’UTR + Cbr-unc119(+)] II. CRISPR/Cas9 insertion of GFP11 tag into endogenous rpa-1 locus in background strain SSM471. GFP::RPA-1 fluorescence only observed in the germline. If germline silencing occurs, transgene expression can be recovered by growing worms at 25C for 2 generations. Reference: Hefel A & Smolikove S. G3. 2019 Jun 5;9(6):1933-1943. PMID: 30992318.
SSM474 syp-4(iow90[GFP11::syp-4]) I; iowSi8 II; unc-119(ed3) III. C. elegans syp-4(iow90[GFP11::syp-4]) I. iowSi8[pie-1p::GFP(1-10)::him-3 3UTR + Cbr-unc119(+)] II. CRISPR/Cas9 insertion of GFP11 tag into endogenous syp-4 locus in background strain SSM471. GFP::SYP-4 fluorescence only observed in the germline. If germline silencing occurs, transgene expression can be recovered by growing worms at 25C for 2 generations. Reference: Hefel A & Smolikove S. G3. 2019 Jun 5;9(6):1933-1943. PMID: 30992318.
SSM476 rpa-1(iow92[OLLAS::rpa-1]) II. C. elegans N-terminal OLLAS tag inserted into the endogenous rpa-1 locus using Crispr/Cas9. Generated in N2 background. Reference: Hefel et al., Nucleic Acids Res. 2021 Jan 21;gkaa1293. doi: 10.1093/nar/gkaa1293.
SSM491 ubc-9(iow97[3xFLAG::ubc-9]) IV/nT1[qIs51] (IV;V). C. elegans Heterozygotes are wild-type with pharyngeal-expressed GFP, and segregate wild-type GFP+(pharynx) heterozygotes, arrested nT1[qIs51] homozygotes, and viable non-GFP(pharynx) ubc-9(iow97[3xFLAG::ubc-9]) homozygotes. Maintain the strain by picking wild-type GFP+ worms and checking for correct segregation of progeny. iow97 was created by CRISPR/Cas9 insertion of a 3xflag tag at the N-terminus of the endogenous ubc-9 locus; however, the tagged protein is not fully functional. SSM491 is a replacement for SSM291: analysis shows that in all parameters tested, SSM491 is identical to SSM291, which was genetically unstable and prone to breaking down. Reference: Reichman R, et al. Genetics. 2018 Apr;208(4):1421-1441.
SSM559 rpa-4(iow128[Myc::rpa-4]) rpa-2(iow49[3xFLAG::rpa-2]) I; rpa-1(iow92[OLLAS::rpa-1]) II. C. elegans CRISPR/Cas9 engineering used to insert N-terminal Myc tag into the endogenous rpa-4 locus, N-terminal 3xFLAG tag into the endogenous rpa-2 locus, and N-terminal OLLAS tag into the endogenous rpa-1 locus. SSM559 was generated by crossing rpa-2(iow49) with rpa-1(iow92), followed by CRISPR insertion of the Myc tag into rpa-4. Reference: Hefel et al., Nucleic Acids Res. 2021 Jan 21;gkaa1293. doi: 10.1093/nar/gkaa1293.
SSM596 rpa-1(iow117)/mIn1[mIs14 dpy-10(e128)] II. C. elegans Crispr/Cas9-engineered indel in the 5’ region of rpa-1. Larval-lethal mutation balanced by GFP- and dpy-10-marked inversion. Heterozygotes are wild-type with relatively dim pharyngeal GFP signal, and segregate WT dim GFP, Dpy bright GFP (mIn1 homozygotes), and non-GFP iow117 homozygotes (larval lethal). Pick wild-type dim GFP and check for correct segregation of progeny to maintain. iow117 was generated in mre-11::GFP background and outcrossed to N2. Reference: Hefel et al., Nucleic Acids Res. 2021 Jan 21;gkaa1293. doi: 10.1093/nar/gkaa1293.
SSM72 exo-1(tm1842) III. C. elegans Reference: Yin Y & Smolikove S. Mol Cell Biol. 2013 Jul;33(14):2732-47.
This laboratory hasn't submitted any alleles to the CGC.