A study led by the Research Institute of the McGill University Health Center (The Institute) has identified a rare genetic variant in the ODAD4 gene that causes primary ciliary dyskinesia (PCD), a chronic hereditary disorder affecting the respiratory system. Through extensive genetic and genealogical analysis, the research team found strong evidence that this variant likely traces back to a single ancestor who lived roughly 330 years ago and may account for undetected PCD cases across Quebec—particularly in the Bas-Saint-Laurent and Côte-du-Sud regions.
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