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Phenotypic variability in Joubert syndrome is partially explained by ciliary pathophysiology.

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Annals of Human Genetics
|November 3, 2023
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Summary

Joubert syndrome (JS) genotype-phenotype correlations are better understood through a large cohort study. This research clarifies genetic links to symptoms, aiding personalized care for JS patients.

Keywords:
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Area of Science:

  • Genetics
  • Developmental Biology
  • Medical Research

Background:

  • Joubert syndrome (JS) is a genetic disorder caused by primary ciliary defects, leading to malformations in multiple organs.
  • While some JS-associated genes have known genotype/phenotype correlations, many lack sufficient data for robust conclusions.

Purpose of the Study:

  • To expand genotype/phenotype correlations in Joubert syndrome by analyzing a large patient cohort.
  • To identify new correlations and refine existing ones for improved clinical management.

Main Methods:

  • A PubMed literature review identified 688 individuals with JS across 32 genes and 112 publications.
  • Patients were included if they presented with the "molar tooth sign" and had a confirmed genetic diagnosis.
  • Data on age, ethnicity, sex, and specific clinical features were collected and analyzed.

Main Results:

  • Most JS-associated genes exhibited distinct phenotypic profiles.
  • Grouping proteins by physiologic interactions strengthened phenotypic relationships, aligning with ciliary pathophysiology.
  • Age-stratified analysis revealed progressive end-organ disease in JS patients.
  • Genetic variants often skewed towards either residual or absent protein function.

Conclusions:

  • Clinically significant genotype/phenotype relationships are evident for most JS-related genes.
  • This comprehensive cohort data can inform more personalized clinical care strategies for individuals with Joubert syndrome.