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CRISPR knockout screen implicates three genes in lysosome function

ABSTRACT: CRISPR knockout screen implicates three genes in lysosome function

PROVIDER: PRJNA530740 | ENA |

REPOSITORIES: ENA

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CRISPR knockout screen implicates three genes in lysosome function

Project description:Defective biosynthesis of the phospholipid PI(3,5)P2 underlies neurological disorders characterized by cytoplasmic accumulation of large acidic vacuoles. To identify novel genetic causes of lysosomal vacuolization, we developed an assay for enlargement of the lysosome compartment that is amenable to cell sorting and pooled screens. After calibration on cells lacking FIG4, a known PI(3,5)P2 biosynthetic factor, we carried out a genome-wide knockout screen that captured fifteen genes, including VAC14 which is known to cause endosomal vacuolization. We selected three genes not previously associated with lysosome dysfunction for validation: C10orf35, LRRC8A, and MARCH7. We isolated two clonal knockout cell lines for each gene and confirmed loss of protein expression. The knockout lines contained enlarged acidic vesicles with surface labeling of the endolysosomal marker LAMP2. This assay will be useful for characterizing variants of unknown significance in patients with neuromuscular or lysosomal storage disorders. This genome-wide strategy for identification of genes with lysosomal function can also be adapted for drug screens to identify small molecules that correct vacuolization.

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