Differential UGT76G1 and start codon-based characterization of six stevia germlines in Egypt

Hashem, Mai M.; AbdelHamid, Reham I.; AbuelMaaty, Shereen; El-Assal, S.; ElDoliefy, Ahmed ElFatih A.

doi:10.1016/j.bcab.2021.101981

Cited by 4 publications

(1 citation statement)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Steviol glycosides (SGs) found in stevia leaves are extracted to produce non-caloric natural sweeteners [3]. Stevia has been the subject of various biotechnologybased studies including transcriptomics and metabolomics approaches to better understand the SGs biosynthetic route to support its commercial interest [4,5]. Stevioside and rebaudioside A make up the majority of stevia's SGs [6].…”

Section: Introductionmentioning

confidence: 99%

DNA Free CRISPR/DCAS9 Based Transcriptional Activation System for UGT76G1 Gene in Stevia rebaudiana Bertoni Protoplasts

Ghose

Abdullah

Hatta

et al. 2022

Plants

View full text Add to dashboard Cite

The UDP-glycosyltransferase 76G1 (UGT76G1) is responsible for the conversion of stevioside to rebaudioside A. Four single guide RNAs (sgRNAs) were designed from the UGT76G1 proximal promoter region of stevia by using the online-based tool, benchling. The dCas9 fused with VP64 as a transcriptional activation domain (TAD) was produced and purified for the formation of ribonucleoproteins (RNPs) by mixing with the in vitro transcribed sgRNAs. Protoplast yield was the highest from leaf mesophyll of in vitro grown stevia plantlets (3.16 × 106/g of FW) using ES5 (1.25% cellulase R-10 and 0.75% macerozyme R-10). The RNPs were delivered into the isolated protoplasts through the Polyethylene glycol (PEG)-mediated transfection method. The highest endogenous activation of the UGT76G1 gene was detected at 27.51-fold after 24 h of transfection with RNP30 consisting of CRISPR/dCas9-TAD with sgRNA30 and a similar activation level was obtained using RNP18, RNP33, and RNP34, produced using sgRNA18, sgRNA33, and sgRNA34, respectively. Activation of UGT76G1 by RNP18 led to a significant increase in the expression of the rate-limiting enzyme UGT85C2 by 2.37-fold and there was an increasing trend in the expression of UGT85C2 using RNP30, RNP33, and RNP34. Successful application of CRISPR/dCas9-TAD RNP in activating specific genes can avoid the negative integration effects of introduced DNA in the host genome.

show abstract

Section: Introductionmentioning

confidence: 99%