3-Methylcrotonyl-Coa Carboxylase Deficiency, also known as 3-methylcrotonylglycinuria, is related to 3-methylcrotonyl-coa carboxylase 1 deficiency and metabolic acidosis, and has symptoms including muscular hypotonia, muscular atrophy and feeding difficulties. An important gene associated with 3-Methylcrotonyl-Coa Carboxylase Deficiency is MCCC1 (Methylcrotonyl-CoA Carboxylase Subunit 1), and among its related pathways/superpathways are Metabolism and Regulation of expression of SLITs and ROBOs. Affiliated tissues include cingulate cortex and kidney, and related phenotypes are hypotonia and hypoglycemia