Macrothrombocytopenia, Isolated, 1, Autosomal Dominant, also known as macthc1, is related to macrothrombocytopenia, isolated, 2, autosomal dominant. An important gene associated with Macrothrombocytopenia, Isolated, 1, Autosomal Dominant is TUBB1 (Tubulin Beta 1 Class VI). Related phenotypes are macrothrombocytopenia and impaired platelet aggregation