Some of the best stuff we picked up around the internet
By: Gorm Palmgren - Jan. 8, 2021
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In the future, CRISPR may be key to help rapidly ageing children. Researchers from David Liu's lab describe in a Nature paper how base editing has been successfully used to double the lifespan in a mouse model of the fatal disease progeria that gives young children the appearance of having aged rapidly. We contacted David Liu right before the paper was published, and you can read our interview with him here.
A new electrochemical microfluidic biosensor has improved detection of microRNAs (miRNAs) that are increasingly used for diagnostics. The new multiplexed CRISPR-Biosensor X divides the biochip's previous single channel into subsections allowing for the amplification-free and simultaneous quantification of up to eight miRNAs.
Phages are the principal target of the adaptive immune system, namely CRISPR, that bacteria and archaea developed as protection from foreign DNA. Studying the CRISPR-Cas spacers in Pseudomonas aeruginosa, researchers now confirm that the system also targets closely related prokaryotic species and that CRISPR acts as an important constraint to horizontal gene transfer.
Researchers have used CRISPR-Cas9 to quickly validate findings from genome-wide association studies (GWASs) that screen large populations for genetic variants linked to a disease or other phenotype. A GWAS study pointed to a putative enhancer element for the gene PRPF38A involved in bone cell formation. When CRISPR-Cas9 was used to delete this sequence, symptoms of a kind of osteoporosis were alleviated.
Intellia Therapeuticshas outlined its expected 2021 milestones and strategies. These include clinical validation of a treatment for transthyretin amyloidosis (ATTR) and a lipid nanoparticle delivery system as well as expanding the company's pipeline of new therapy candidates for genetic diseases and cancers.
COVID-19
A new test for the rapid detection of Sars-CoV-2 specific RNA has been developed by Jennifer Doudna's lab and is posted on the medRxiv* server. The test is called DISCoVER (DiagnosticS with Coronavirus Enzymatic Reporting) and uses viral nucleic acid amplification and Cas13-mediated detection without RNA extraction.
In 2018, the European Court effectively ruled out CRISPR-edited crops by classifying them as GMOs. However, researchers challenge the ruling's interpretation that defines GMOs as organisms that "have been altered in a way that does not occur naturally". The researchers argue that many edits imposed by CRISPR can occur naturally and therefore crops altered in such ways are not GMOs as defined by the EU.
Researchers have taken the first steps toward uncovering attempts from athletes to use CRISPR-Cas9 for gene doping. They use mass spectrometry to detect fragments of Cas9-protein in blood plasma. So far they have succeeded doing so in plasma spiked with Cas9 in either its active form used for conventional gene editing or in its inactive form used for base or prime editing.