i-stop codon positions in the mcherry gene
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- Dwayne Williams
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1 Supplementary Figure 1 i-stop codon positions in the mcherry gene The grnas (green) that can potentially generate stop codons from Trp (63 th and 98 th aa, upper panel) and Gln (47 th and 114 th aa, bottom panel) are shown. Potential Cytosines (or guanines) that may generate stop codons are red and corresponding inverted Thymines (or Adenines ) are blue labeled.
2 Supplementary Figure 2 Expressing WT-Cas9 and BE3 complex in HEK293T cells (a) Schematics of WT-Cas9 and BE3 complex expression vectors. (b) Western blot demonstrates the expression levels of WT-Cas9 and BE3 proteins after transient transfection of indicated plasmid concentrations. Protein levels were detected using the HA antibody which is fused to the C termini of both protein.
3 Supplementary Figure 3 BE3 activity is abolished when the catalytic activity of rat Apobec1 is double mutated (a) Proline (P) at 29 and glutamic acid(e) at 181 were mutated into phenylalanine(f) and Glutamine (Q) respectively by using site directed mutagenesis. Sanger sequencing analyses show mutated nucleotide by red color for both loci and altered codon is underlined. (b) Mutant BE3 lost its activity for the silencing of mcherry signal in the presence of sgrna 3 and sgrna4 with respect to the wild type BE3. Dot plot shows flow cytometry measured percent of mcherry-negative cells upon guiding BE3(wild type) or BE3(double mutant) by sgrna3 and 4.
4 Supplementary Figure 4 Effects of synonymous mutation for gene KO (a) Sequence of the sgrna which produces synonymous mutation in the presence of BE3 complex. There are two potential C s in the first eight nucleotides of protospacer. Red nucleotides show the target C s and blue nucleotides demonstrate the edited bases. Yellow color highlights the PAM region. (b) Control sgrna and synonymous sgrna are used in the presence of WT-Cas9 and BE3 complex. Dot plot shows flow cytometry measured percent of mcherry-negative cells upon guiding WT-Cas9 or BE3.Each dot represents separate experiments. P-value is calculated with unpaired t-test (***<0.001). (c)flow cytometry analysis showing percent mcherry negative cells in low copy number cell line in the presence of WT-Cas9 and BE3. X-axis denotes mcherry signal and Y-axis demonstrates the cell number. (d) Sanger sequencing represents the nucleotide change in the Asp codon. While red codons show the wild type Asp codon in mcherry gene, blue codons represent the Asp codon after the synonymous mutation. Yellow indicates the PAM region and underlined sequence represents the sgrna (left panel). Right panel shows sanger sequencing chromatographs of the nucleotide sequence for control and clone#6 with the edited base (*) sign shows perfect 100 % match.
5 Supplementary Figure 5
6 Sanger sequencing analysis of C to T (or G to A) conversion in Trp codon (a) mcherry target sequence was cloned from mcherry population cells transfected with sgrna3 and BE3. 4/9 colonies have induced stop codon (i-stop, shown by blue) at the location of Trp (63 th aa) (b) Sanger DNA sequencing profiles illustrate edited nucleotides following BE3 and sgrna3 transfection. Sanger sequencing color code is only used for Trp codon nucleotides. Arrows indicate the 4 th and 8 th positions of the sgrna guiding sequence distal to PAM. (c) Sanger sequencing analysis of genetic changes induced by BE3 and WT- Cas9. mcherry target sequence was cloned from low copy mcherry cells following transfection with sgrna4 in the presence of WT-Cas9 or BE3. 4/10 colonies have i-stop codons (shown by blue) at the location of Trp (98 th aa) for BE3 transfection. There was no further C to T conversion or any other base changes in 50 bp flanking regions of sgrna4 target site. On the other hand, WT-Cas9 introduced deletions (shown by gray dashes) in the 3/10 colonies shown in the bottom panel. sgrna target sequences are underlined on the mcherry gene and complementary bases of PAM region on the coding strand were highlighted with yellow. Trp and i- stop codons are highlighted with red and blue respectively. Any other substitutions are labeled by brown. (*) sign shows perfect 100 % match.
7 Supplementary Figure 6 Identification of the copy numbers in single cell colonies from mcherry population cells Relative mcherry copy number levels were quantified in real time-pcr by using the GAPDH primer as a control genomic region. Clone #4, #6 and #12 were used as low, medium and high mcherry copy number cell lines, respectively.
8 Supplementary Figure 7 Comparative analysis of KO efficiency of WT-Cas9 and BE3 mediated CRISPR-STOP approach (a) Dot plot shows flow cytometry measured percent of mcherry-negative cells upon guiding WT-Cas9 or BE3 by four separate sgrnas for four mcherry-targeting sgrnas following WT-Cas9 or BE3 transfection in low and high copy number cell lines. Each dot represents seperate experiments. The black lines on each bar in the dot plots show the mean of three or more replicates. P-value is calculated with unpaired t-test (*<0.05;**<0.01). (b) Flow cytometry analysis showing percent mcherry-negative cells. X-axis denotes mcherry signal and Y- axis demonstrates the cell number. Top two rows are showing the flow analysis for mix population of mcherry cells, middle two rows show the same analysis in low copy mcherry cells and bottom two rows show the rate of silencing in high copy mcherry cells. (c) mcherry-knock out cells (yellow arrows) are shown in the merged images of fluorescence microscopy. sgrna3 was used in the presence of BE3 in the low copy mcherry cell line.
9 Supplementary Figure 8 WT-Cas9 has more deleterious effects compared to the BE3 when targeted to a high copy number loci (a)dot plot summarizes the flow cytometry analysis of the normalized AnnexinV staining levels in low, medium and high copy number cells expressing sgrna3 with WT-Cas9 or BE3. Each dot represents separate experiments. The black lines on each bar in the dot plots show the mean of three or more replicates. P-value is calculated with unpaired t-test (*<0.05). (b) Flow cytometry profiles are showing DAPI and AnnexinV-FITC staining. SgRNA3 and sgrna4 were transfected to high copy mcherry cells together with WT-Cas9 or BE3. Apoptotic cells are stained by AnnexinV-FITC. Of note, cells in the center of each population, which were shown by yellow or red dots, shifted right in the WT-Cas9 treatment. Numbers in each quarter demonstrates the percent cell number. (c) Flow histogram shows AnnexinV staining levels in high copy number mcherry cells upon guiding WT-Cas9 and BE3 with control and mcherry targeting sgrna #3.
10 Supplementary Figure 9 Phospho-H2Ax staining shows WT-Cas9 and BE3 induced levels of DNA damage SgRNA3 and sgrna4 were transfected to high copy mcherry cells together with WT-Cas9 or BE3.Scale bar represents 5 µm.
11 Supplementary Figure 10 CRISPR-STOP mediated gene silencing in endogenous loci. (a, b) Green bars under exons of each gene denote the positions of sgrnas for EHMT2 (a) and LMNB2 (b) in the upper panel. Western blot analyses of protein levels after transient transfection of the indicated sgrnas are shown on the left sides of the bottom panel. Right sites of the bottom panel show the control protein expression of alpha-tubulin. Numbers on the left site of the images indicate the sizes of the protein marker.
12 Supplementary Figure 11 Comparative analysis of KO efficiency of WT-Cas9 and BE3 mediated gene silencing in endogenous LMNB2 loci X-axis shows the BL1-mClover signal intensity and y-axis demonstrates the cell number in the flow cytometry analysis. Numbers on the bars show the percentage mclover(-) and mclover(+) cell numbers for each treatment. Top panel shows the distribution of HCT-116 control cells (no mclover). WT-Cas9 and BE3 transfected cells are shown by the middle two and bottom two panels, respectively. Numbers (#1 thru #8) show the LMNB2 sgrna numbers.
13 Supplementary Figure 12 Characteristics of CRISPR-STOP library (a) Bar plots shows the total numbers of unique sgrnas that target the four codons in the human exome. (b) The percentages of sgrnas with different oligonucleotide stretches are shown for both the CRISPR-STOP and GeCKOv2 libraries. Only 0.9% of the sgrnas contain 6-mer or above for i-stop, and 0.6% for GeCKOv2. (c) GC content of the sgrnas in the CRISPR-STOP and GeCKOv2 libraries is shown. Densities of GC content between the two libraries are comparable, with the mean for i-stop slightly higher due to the specific codons targeted. (d) Nucleotide compositions at each position of the 20 base pairs of the sgrnas were compared between the CRISPR-STOP and GeCKOv2 libraries. In general, the four nucleotides are equally distributed at each position. As expected, the distribution is skewed slightly between the 4th to 8th positions of the sgrnas in the CRISPR-STOP library due to the specific codons targeted. (e) The schematic outline of the CRISPR-STOP mediated knockout screening with a library containing 27 sgrnas in HEK293T cells.
14 Supplementary Table 1 (List of oligos for sgrna) Used in mini Lib Names Sequence yes mcherry-gln(47)+pam cacccagaccgccaagctgaagg mcherry-sg1(f) caccgacccagaccgccaagctga mcherry-sg1(r) aaactcagcttggcggtctgggtc yes mcherry-gln(114)+pam gacccaggactcctccctgcagg mcherry-sg2(f) caccgacccaggactcctccctgc mcherry-sg2(r) aaacgcagggaggagtcctgggtc yes mcherry-trp(63)+pam tgtcccaggcgaagggcaggggg mcherry-sg3(f) caccggtcccaggcgaagggcagg mcherry-sg3(r) aaaccctgcccttcgcctgggacc yes mcherry-trp(98)+pam gctcccacttgaagccctcgggg mcherry-sg4(f) caccgctcccacttgaagccctcg mcherry-sg4(r) aaaccgagggcttcaagtgggagc yes EHMT2-Gln(145)+PAM ctgtccagagtttggctatgagg EHMT2(G9a)-sg1(F) caccgtgtccagagtttggctatg EHMT2(G9a)-sg1(R) aaaccatagccaaactctggacac yes EHMT2-Gln(297)+PAM tgaacaactaagtgaagaggagg EHMT2(G9a)-sg2(F) caccggaacaactaagtgaagagg EHMT2(G9a)-sg2(R) aaaccctcttcacttagttgttcc yes EZH2-Gln(328)+PAM accacagtgttaccagcatttgg EZH2-sg1(F) caccgccacagtgttaccagcatt EZH2-sg1(R) aaacaatgctggtaacactgtggc yes EZH2-Gln(559)+PAM gaaggtcaaaaccgctttccggg EZH2-sg2(F) caccgaaggtcaaaaccgctttcc EZH2-sg2(R) aaacggaaagcggttttgaccttc yes EZH2-Trp(113)+PAM ggagaccaagaatacattatggg EZH2-sg3(F) caccggagaccaagaatacattat EZH2-sg3(R) aaacataatgtattcttggtctcc yes HPRT1-Arg(51)+PAM tcttgctcgagatgtgatgaagg HPRT1-sg1(F) caccgcttgctcgagatgtgatga HPRT1-sg1(R) aaactcatcacatctcgagcaagc yes HPRT1-Gln(144)+PAM aatgcagactttgctttccttgg HPRT1-sg2(F) caccgatgcagactttgctttcct HPRT1-sg2(R) aaacaggaaagcaaagtctgcatc yes HPRT1-Gln(152)+PAM caggcagtataatccaaagatgg HPRT1-sg3(F) caccgaggcagtataatccaaaga HPRT1-sg3(R) aaactctttggattatactgcctc yes puro-trp(76)+pam cgtggtccagaccgccaccgcgg puro-sg1(f) caccggtggtccagaccgccaccg puro-sg1(r) aaaccggtggcggtctggaccacc
15 yes puro-gln(106))+pam gccgcgcagcaacagatggaagg puro-sg2(f) caccgccgcgcagcaacagatgga puro-sg2(r) aaactccatctgttgctgcgcggc yes puro-gln(108)+pam gcaacagatggaaggcctcctgg puro-sg3(f) caccgcaacagatggaaggcctcc puro-sg3(r) aaacggaggccttccatctgttgc yes puro-trp(123)+pam aggaaccacgcgggctccttggg puro-sg4(f) caccgggaaccacgcgggctcctt puro-sg4(r) aaacaaggagcccgcgtggttccc yes Lib_Cont-Sg_1F caccgagaaggatggaaattagaa Lib_Cont-Sg_1R aaacttctaatttccatccttctc yes Lib_Cont-Sg_2F caccgccccgccgccctcccctcc Lib_Cont-Sg_2R aaacggaggggagggcggcggggc yes Lib_Cont-Sg_3F caccgaagaaagaggaatagtagc Lib_Cont-Sg_3R aaacgctactattcctctttcttc yes Lib_Cont-Sg_4F caccgagaagtggggagccattgg Lib_Cont-Sg_4R aaacccaatggctccccacttctc yes Lib_Cont-Sg_5F caccggaagaaaaaaatgtctacg Lib_Cont-Sg_5R aaaccgtagacatttttttcttcc LMNB2-Arg(16)+PAM gccgcgagccgccgccaccatgg LMNB2-sg1F caccgccgcgagccgccgccacca LMNB2-sg1R aaactggtggcggcggctcgcggc LMNB2-Gln(146)+PAM ggtggcccagggccgtgtgaagg LMNB2-sg2F caccggtggcccagggccgtgtga LMNB2-sg2R aaactcacacggccctgggccacc LMNB2-Gln(295)+PAM ctctgaccagaacgacaaggcgg LMNB2-sg3F caccgtctgaccagaacgacaagg LMNB2-sg3R aaacccttgtcgttctggtcagac LMNB2-Gln(213)+PAM ccgctgccagagcctgcaggagg LMNB2-sg4F caccgcgctgccagagcctgcagg LMNB2-sg4R aaaccctgcaggctctggcagcgc LMNB2-Gln(183)+PAM cgggcccagctggccaaggtagg LMNB2-sg5F caccggggcccagctggccaaggt LMNB2-sg5R aaacaccttggccagctgggcccc LMNB2-Gln(466,467)+PAM gcccagcaggcctcggcctcggg LMNB2-sg6F caccgcccagcaggcctcggcctc LMNB2-sg6R aaacgaggccgaggcctgctgggc LMNB2-Gln(487)+PAM tgtgcagctcaagaacaactcgg LMNB2-sg7F caccggtgcagctcaagaacaact LMNB2-sg7R aaacagttgttcttgagctgcacc LMNB2-Gln(506)+PAM gaggcaggtcttggagggggagg LMNB2-sg8F caccgaggcaggtcttggaggggg LMNB2-sg8R aaacccccctccaagacctgcctc
16 cont-sg(f) cont-sg(r) caccgggtcttcgagaagacctgt aaacacaggtcttctcgaagaccc
17 Supplementary Table 2 (Primers for library preparation) Primer Name lib-outf lib-outr lib-in-f-index10 lib-in-f-index11 lib-in-f-index12 lib-in-f-index18 lib-in-f-index21 Sequence (6-bp barcode sequences are shown by small letter in the Lib-IN-For primer) cagggacagcagagatccag cggagccaattcccactcc CAAGCAGAAGACGGCATACGAGATCtagcttTTTCTTGGGTAGTTTGCAGTTTT CAAGCAGAAGACGGCATACGAGATCggctacTTTCTTGGGTAGTTTGCAGTTTT CAAGCAGAAGACGGCATACGAGATCcttgtaTTTCTTGGGTAGTTTGCAGTTTT CAAGCAGAAGACGGCATACGAGATCgtccgcTTTCTTGGGTAGTTTGCAGTTTT CAAGCAGAAGACGGCATACGAGATCgtttcgTTTCTTGGGTAGTTTGCAGTTTT lib-in-f-index4 lib-in-f-index5 lib-in-f-index6 lib-in-f-index22 lib-in-f-index27 lib-in-rev illmn-seqp illmn-indexp CAAGCAGAAGACGGCATACGAGATCtgaccaTTTCTTGGGTAGTTTGCAGTTTT CAAGCAGAAGACGGCATACGAGATCacagtgTTTCTTGGGTAGTTTGCAGTTTT CAAGCAGAAGACGGCATACGAGATCgccaatTTTCTTGGGTAGTTTGCAGTTTT CAAGCAGAAGACGGCATACGAGATCcgtacgTTTCTTGGGTAGTTTGCAGTTTT CAAGCAGAAGACGGCATACGAGATCattcctTTTCTTGGGTAGTTTGCAGTTTT AATGATACGGCGACCACCGAGATCTACACCGACTCGGTGCCACTTTT CGGTGCCACTTTTTCAAGTTGATAACGGACTAGCCTTATTTTAACTTGCTATTTCTAGCTCTAAAAC TTTCAAGTTACGGTAAGCATATGATAGTCCATTTTAAAACATAATTTTAAAACTGCAAACTACCCAAGAAA
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