MitoPhen

MitoPhen curates and analyzes clinical phenotypes mapped to the Human Phenotype Ontology (HPO) to characterize phenotypic spectra and heteroplasmy relationships of pathogenic mitochondrial DNA (mtDNA) mutations.

Key Features:

• Comprehensive Curation: Aggregates data from 6,688 individuals with 89 pathogenic mtDNA mutations and over 26,348 HPO terms to characterize variant-specific phenotypic spectra.
• Hypothesis-Free Syndrome Definition: Defines clinical syndromes related to mtDNA mutations using objective, ontology-based aggregation of HPO terms without prior hypotheses.
• Heteroplasmy-Phenotype Relationships: Provides insights into relationships between heteroplasmy levels and phenotypic manifestations.
• Identification of Under-Recognized Phenotypes: Uncovers phenotypes associated with mtDNA variants that may be under-recognized or under-documented.
• Phenotype Similarity Scores: Computes HPO-based phenotype similarity scores to quantify resemblance between patient profiles and curated mtDNA-associated phenotypes.

Scientific Applications:

• Objective Clinical Comparison: Enables objective comparison of new patient HPO-encoded phenotypes to curated mtDNA-associated profiles for diagnostic interpretation.
• Phenotype Similarity Scores: Differentiates mitochondrial disorders from other rare diseases using HPO-based phenotype similarity scores with reported performance of less than 10% false discovery rate at 80% sensitivity in validation cohorts including confirmed mtDNA and non-mitochondrial nuclear genetic diagnoses.

Methodology:

Curates clinical phenotypes from published literature for individuals with pathogenic mtDNA mutations by mapping attributes to HPO terms, computes HPO-based phenotype similarity scores, and analyzes phenotype data including heteroplasmy-phenotype relationships.