Cardiomyopathy-hypotonia-lactic acidosis syndrome is characterized by hypertrophic cardiomyopathy, muscular hypotonia and the presence of lactic acidosis at birth. It has been described in two sisters (both of whom died within the first year of life) from a nonconsanguineous Turkish family. The syndrome is caused by a homozygous point mutation in the exon 3A of the SLC25A3 gene encoding a mitochondrial membrane transporter. The disease is Monarch Disease Ontology entry MONDO_0012557 (cardiomyopathy-hypotonia-lactic acidosis syndrome). Also known as: hypertrophic cardiomyopathy with hypotonia and lactic acidosis syndrome.