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Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing  genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
Forward genetic screens
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Functional Screening of NDUFAF6 Variants in Knockout Cells and Complementary Computational Analysis.

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Experimental validation is crucial for classifying NDUFAF6 variants, which are linked to mitochondrial diseases. An ATP assay effectively assesses variant function, aiding in diagnostics.

Keywords:
NDUFAF6ATP assaymitochondrial diseasesmitochondrial dysfunctionvariants of uncertain significance

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Area of Science:

  • Genetics
  • Mitochondrial Biology
  • Molecular Medicine

Background:

  • NDUFAF6 is essential for mitochondrial respiratory chain complex I assembly.
  • Mutations in NDUFAF6 are associated with mitochondrial diseases.
  • The functional impact of many NDUFAF6 variants is currently unknown.

Purpose of the Study:

  • To experimentally validate the functional consequences of 24 NDUFAF6 variants.
  • To assess the utility of an ATP-based functional assay for variant classification.
  • To improve the diagnostic accuracy for NDUFAF6-related mitochondrial disorders.

Main Methods:

  • Generated NDUFAF6 knockout HEK293FT cells using CRISPR-Cas9.
  • Transfected cells with wild-type or mutant NDUFAF6 expression vectors.
  • Validated variant function using a luminescence-based ATP assay and in silico predictions.

Main Results:

  • Six variants demonstrated significant loss of function by failing to restore ATP levels.
  • Identified discrepancies between experimental results and existing database classifications for some variants.
  • Observed retained mitochondrial targeting for most variants, with some showing altered cleavage sites and structural instability.

Conclusions:

  • Experimental validation is essential for accurate NDUFAF6 variant classification.
  • The ATP assay is a valuable tool for assessing mitochondrial variant effects.
  • This approach can enhance mitochondrial disease diagnostics.