Its main characteristics often include combinations in varying degrees of cardiomyopathy (a disorder of the heart muscle leading to a poorly functioning heart), neutropenia (a reduction in the number of white blood cells which may lead to an increased risk for bacterial infections), hypotonia (reduced muscle tone), muscle weakness, undeveloped skeletal muscles, delayed growth, lack of stamina, varying degrees of physical disability, and methylglutaconic aciduria (an increase in an organic acid that results in abnormal mitochondria function). Although some with BTHS may have all of these characteristics, others may have only one or two, and, thus, are often misdiagnosed. BTHS is an X-linked genetic condition passed from mother to son through the X chromosome. A mother who is a carrier of BTHS shows no signs or symptoms of the disorder herself. On average, 50 percent of children born to a carrier mother will inherit the defective gene, but only boys will develop symptoms. All daughters born to an affected male will be carriers.
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