CD3D wt Allele

**Semantic type:** Gene or Genome

**Definition:** Human CD3D wild-type allele is located within 11q23 and is approximately 4 kb in length. This allele, which encodes T-cell surface glycoprotein CD3 delta chain protein, plays a role in the regulation of signal transduction underlying the developmental transition of immature thymocytes to mature CD4+ or CD8+ T cells. Certain allelic variants of the CD3D gene cause a form of severe combined immunodeficiency (SCID) characterized by the absence of T cells but normal numbers of B cells and NK cells.

**Synonyms:** - CD3D Antigen, Delta Polypeptide (TiT3 Complex) wt Allele - T3D