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LONP1 Variants Are Associated With Clinically Diverse Phenotypes.

Randee E Young1, Lu Qiao2,3, Rebecca Hernan1

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Genetic variants in LONP1, a mitochondrial protease, cause a range of developmental disorders. This study identifies 16 new variants, expanding the known clinical spectrum of LONP1-associated conditions.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Developmental Biology

Background:

  • LONP1 is a mitochondrial protease crucial for protein homeostasis and cellular metabolism.
  • Genetic variants in LONP1 are linked to diverse disorders including CODAS syndrome, congenital diaphragmatic hernia (CDH), and neurodevelopmental disorders (NDD).

Purpose of the Study:

  • To identify novel variants in the LONP1 gene.
  • To expand the understanding of the clinical and genetic spectrum of LONP1-associated disorders.
  • To investigate the structural and mechanistic basis of genotype-phenotype correlations.

Main Methods:

  • Whole-exome sequencing or targeted gene sequencing.
  • Clinical data review of affected individuals.
  • Structural analysis of identified variants within the LONP1 protein.

Main Results:

  • Sixteen novel LONP1 variants were identified in 16 individuals, including 11 with NDD and 5 with CDH.
  • Structural mapping indicated phenotype-specific clustering of missense variants.
  • CODAS is associated with biallelic loss-of-function variants, while CDH is linked to monoallelic loss-of-function variants.

Conclusions:

  • The study expands the phenotypic and genetic landscape of LONP1-related disorders.
  • LONP1 plays a critical role in human development and mitochondrial function.
  • Both monoallelic and biallelic LONP1 variants contribute to NDD, suggesting complex pathogenic mechanisms.