A CRISPR/Cas9-mediated gene editing to enhance the expression of the Solanum lycopersicum MYB12 gene and the nutritional value of tomato
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1 A CRISPR/Cas9-mediated gene editing to enhance the expression of the Solanum lycopersicum MYB12 gene and the nutritional value of tomato Dr. Aurelia Scarano Napoli, 22 Dicembre 2017
2 Phenylalanine Phenolic acids 4-Coumarate-Coa Stilbenes Naringenin Chalcone Isoflavones Flavanols Proanthocyanidins Naringenin Dihydroflavonols Flavonols Flavones Aurones BENEFITS FOR THE HEALTH Antioxidant activities Anti-inflammatory properties Healthy aging Protection against inflammatory and chronic diseases Anthocyanins
3 In tomato, polyphenols are present only in the skin (1% of the whole fruit) Improvement of polyphenol content with conventional breedings Metabolic engineering is a useful tool to increase the levels of polyphenols in crops, such as tomato
4 Phenolic acids Dihydroquercetin FLS Quercetin Rutin GT F3 H DFR ANS 3GT RT 5GT Cyanidins Phenylalanine PAL 4-Coumarate-Coa CHS Naringenin Chalcone CHI Naringenin F3H Dihydrokaempferol F3 5 H FLS DFR Kaempferol ANS 3GT RT 5GT Pelargonidins AtMYB12 Dihydromyricetin Myricetin DFR ANS 3GT RT 5GT Petunidins AmDelila (bhlh) AmRosea1 (MYB) Over-expression under the fruitspecific E8 promoter
5 Phenylalanine PAL VvStSy WT 4-Coumaroyl-CoA Resveratrol Piceid CHS Naringenin Chalcone CHI Naringenin F3H Dihydroflavonols Stilbenes 35S::StSy Flavonols Anthocyanins
6 ISPA-CNR, Lecce, Italy (Dr. Angelo Santino) and John Innes Centre, Norwich, UK (Prof. Cathie Martin) WT AmDel/Ros1 Anthocyanins AtMYB12 Flavonols AtMYB12/VvStSy Flavonols Stilbenes AtMYB12/AmDel/Ros1 AtMYB12/AmDel/ Ros1/VvStSy Flavonols Anthocyanins Flavonols Anthocyanins Stilbenes
7 Antioxidant capacity in Bronze 7-fold higher than in WT DSS- induced inflammation as a model of IBD (Inflammatory Bowel Disease) Start DSS treatment Diets enriched in flavonols, anthocyanins and stilbenes alleviate the symptoms of gut inflammation Scarano A., Santino A., et al. 2017, Frontiers in Nutr, in revision
8 genome editing technologies The CRISPR/Cas9 system Site-specific mutations on the target gene, using Cas9 endonuclease Cas9 is driven by RNA-guide/s to recognize a target PAM sequence and cut 3 nucleotides upstream
9 chromatids NHEJ (Non-homologous end joining) HR (Homologous recombination) Small deletions or small insertions + donor template Knocked-in sequence of interest
10 insertion of the 35S promoter ANT1 gene Viral sequences Cermak T. Genome Biology 2015
11 Insertion E8 promoter upstream MYB12 gene homologous recombination (via HR) Transient expression assays Stable transformation with Agrobacterium tumefaciens
12 Gene of interest: SlMYB12 (involved in the flavonoid pathway) RNA guide CTATTTATTGGCATTTCTATTGG SlMYB12 promoter SlMYB12 gene LB RB NPTII Cas9 sgrna LIR Homology arm E8 promoter Homology arm RepLIR
13 Transformation with Agrobacterium rhizogenes: 57 transformed/ 60 hairy roots Screening to detect gene targeting events A B E F Flanking genomic region MYB12 promoter (Homology) E8 promoter MYB12 gene (Homology) Flanking genomic region LEFT JUNCTION RIGHT JUNCTION LEFT JUNCTION F6 G6 CRISPR/Cas9 editing - via HR: 1/57: left and right junction RIGHT JUNCTION WT F6 B8 H6 1/57: left junction 2/57: right junction
14 CTATTTATTGGCATTTCTATTGG Off target 1 (strand +): ACTTTTATTGGCATTTCAATTGG Off target 2 (strand -): ATGTTTATTAGCGTTTCTATTGG off-target #1 WT G6 F6 B8 H6 off-target #2 WT G6 F6 B8 H6 WT WT G6 G6 F6 F6 B8 B8 H6 H6
15 CTATTTATTGGCATTTCTATTGG Off target 3 (strand -): TTTTTTATTGGAGTTTCTATGGG Off target 4 (strand +): CTATCTACTGTCATTTCTAAAGG Off target 5 (strand +): GTATTTATTGAGATTTCAATAGG off-target #3 off-target #4 off-target #5 WT G6 F6 B8 H6 WT G6 F6 B8 H6 WT G6 F6 B8 H6 WT WT WT G6 G6 G6 F6 F6 F6 B8 B8 B8 H6 H6 H6
16 1 LB Site guide Site guide RB NPTII 35S:Cas9 sgrna E8 promoter 2 Site guide Site guide LB RB NPTII Rp5Sa:Cas9 sgrna E8 promoter
17 CRISPR/Cas9 editing - via HR: No off-target activities Stable transformation with Agrobacterium tumefaciens CRISPR/Cas9 editing - via NHEJ: Hairy roots expression assays Stable transformation with Agrobacterium tumefaciens
18 Dr Angelo Santino Prof Cathie Martin, Dr Eugenio Butelli Dr Fabio D Orso Thank you!
Supplementary Figures
Supplementary Figures Supplementary Figure 1. AtMYB12 antibody detects both Arabidopsis and tomato MYB12 protein. (a) AtMYB12 antibody detects both SlMYB12 and AtMYB12 in tomato fruit. Both WT and AtMYB12
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