Cystathioninuria, also known as gamma-cystathionase deficiency, is related to mitochondrial dna depletion syndrome 3 and mitochondrial dna depletion syndrome. An important gene associated with Cystathioninuria is CTH (Cystathionine Gamma-Lyase), and among its related pathways/superpathways are Metabolism and Regulation of expression of SLITs and ROBOs. Affiliated tissues include liver and brain, and related phenotypes are cystathioninuria and intellectual disability