Why is U6 promoter used for shRNA?

U6 is the most optimal promoter to produce shRNAs, while CMV is used to express whole genes. Best. Pol III genes and promoters do not get polyadenylated and thus are ideal for making small nuclear RNAs such as shRNA hairpins.

How strong is U6 promoter?

U6 promoter is constitutively active in a variety of cell types and maintains relatively high activity by providing approximately 4×105 transcripts per cell (29).

Why is U6 promoter used for Crispr?

Arabidopsis thaliana U6 promoters are commonly used in dicot CRISPR/Cas9 cassettes to drive the expression of sgRNAs as they are thought to achieve high expression levels.

Where exactly does Cas9?

The Cas9 cuts 3-4bp upstream of the PAM sequence. There can be some off-target DSBs using wildtype Cas9.

Do human U6 gene promoters drive stronger shRNA activity than schistosomes?

The findings indicate that a human U6 gene promoter drives stronger shRNA activity than its schistosome orthologue, not only in a human cancer cell line but also in larval schistosomes.

Is human RNA polymerase III promoter U6 more efficient than murine?

Of mice and men: human RNA polymerase III promoter U6 is more efficient than its murine homologue for shRNA expression from a lentiviral vector in both human and murine progenitor cells. Exp Hematol. 2010;38:792–797.

How many shRNA libraries do you offer for human and mouse?

For both human and mouse, we offer shRNA libraries at two scales: Whole Genome (~19,000 RefSeq genes) and Elite Gene (~2,000 most frequently cited genes on PubMed Central). On average, every gene is targeted by 5-6 different shRNAs with good knockdown scores calculated based on a set of rules following the guideline of the RNAi consortium (TRC).

How are shRNAs represented in different pooled plasmid libraries?

Representation of shRNAs in different pooled plasmid libraries. shRNA read counts are normalized by NGS library size (10 million reads) and plotted in log2 scale.