NCIt definition : Human CD40 wild-type allele is located within 20q12-q13.2 and is approximately 186
kb in length. This allele, which encodes tumor necrosis factor receptor superfamily
member 5 protein, is involved in the modulation of T cell-dependent immunoglobulin
class switching, memory B cell development, and germinal center formation. Deletions
in the gene are associated with hyper-IgM immunodeficiency type 3. The gene may play
a role in the pathogenesis of Alzheimer's disease.;
NCIt note : The CD40 gene is expressed as two isoforms that are produced by alternative splicing.
One isoform has a transmembrane domain and the other is a secreted protein. (SwissProt);