Global Developmental Delay, Progressive Ataxia, and Elevated Glutamine, also known as glutaminase deficiency with impaired intellectual development and progressive ataxia, is related to infantile cataract, skin abnormalities, glutamate excess, and impaired intellectual development. An important gene associated with Global Developmental Delay, Progressive Ataxia, and Elevated Glutamine is GLS (Glutaminase). Affiliated tissues include brain, and related phenotypes are global developmental delay and delayed speech and language development