Variation in MAPT is not a contributing factor to the incomplete penetrance in LHON.

Abstract excerpt

Leber's hereditary optic neuropathy (LHON) is a common cause of inherited blindness, primarily due to one of three mitochondrial DNA (mtDNA) mutations. LHON, which has an unexplained variable penetrance and pathology, is characterised by disruption of the mitochondrial respiratory chain ultimately resulting in degeneration of the retinal ganglion cells. Phosphorylation of the tau protein is known to cause...

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