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Sengers syndrome is a rare autosomal recessive mitochondrial (cells that create energy) depletion disorder that causes a loss of function of the acylglycerol kinase (AGK) gene that is responsible for maintaining mitochondrial DNA, resulting in infants that are born with congenital cataracts, hypertrophic cardiomyopathy (thickening of heart muscle; HOCM), skeletal myopathy, and lactic acidosis.