C4B_2 wt Allele

**Semantic type:** Gene or Genome

**Definition:** Human C4B_2 wild-type allele is located in the vicinity of the 6p21.3 alternate reference locus and is approximately 21 kb in length. This allele, which encodes complement C4-B protein, plays a role in complement-dependent immune processes. The expression of this gene is associated with the expression of Chido blood group antigens. Mutation of the gene is associated with complement component C4B deficiency. Copy number variation and polymorphisms are associated with increased risk for systemic lupus erythematosus.

**Synonyms:** - Complement Component 4B (Chido Blood Group), Copy 2 wt Allele