Immunodeficiency-129 (IMD129) is an autosomal recessive immunologic disorder characterized by recurrent bacterial, viral, and fungal infections beginning in the first or second decades of life. Some affected individuals have increased susceptibility to certain human papillomaviruses (HPV), resulting in warts and skin lesions that do not respond to treatment, as well as opportunistic infections. Immunologic studies usually show decreased CD4+ T cells, increased effector memory T cells, and decreased naive T cells, suggesting a defect in T-cell development. Some individuals may also have decreased NK cells and B cells, as well as hypogammaglobulinemia. The phenotype is variable (Crequer et al., 2012; Zhou et al., 2024).

Immunodeficiency-79 (IMD79) is an autosomal recessive disorder characterized by childhood onset of recurrent and recalcitrant skin warts due to uncontrolled viral infection with human papillomavirus (HPV). Some patients may also have recurrent respiratory infections beginning in childhood, but the phenotype overall is mild compared to other primary immunodeficiencies. Patients may not come to attention until adulthood. Laboratory studies show absence of the CD4 antigen on T cells, monocytes, and dendritic cells, with variable secondary abnormalities in B cells and NK cells due to lack of CD4+ T cells (summary by Lisco et al., 2021).