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A new light-inducible RNA base editing tool, padCas13, combines the specificity of CRISPR-Cas13 with the control of light activation and allows for precise, reversible RNA targeting and degradation in mammalian cells, both in vitro and in vivo. 
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BigField GEG Tech's insight:
The authors describe a protocol for the targeted integration of a doxycycline-inducible transgene expression system in a safe harbor site in iPSCs. This gene targeting strategy uses zinc finger nucleases (ZFNs) to enhance homologous recombination at the AAVS. This protocol could be also compatible with the use of TALEN or CRISPR.
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The padCas13 editor can efficiently edit A-to-I and C-to-U RNA bases, targeting disease-relevant transcripts. Photoactivatable base editing represents a significant advance in CRISPR technology, as it enables fine-tuning of gene expression and post-translational modifications without permanent alterations to the genome. This method is particularly relevant for diseases in which transient modulation of gene expression may have therapeutic benefits. A crucial element of padCas13 is the Magnet system, which comprises a positively and negatively charged Magnet protein. These proteins are designed to heterodimerize rapidly in response to light, thereby activating the Cas13 nuclease.
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