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Guérin, Antoine; Moncada-Vélez, Marcela; Jackson, Katherine; Ogishi, Masato; Rosain, Jérémie; Mancini, Mathieu; Langlais, David; Nunez, Andrea; Webster, Samantha; Goyette, Jesse; Khan, Taushif; Marr, Nico; Avery, Danielle T; Rao, Geetha; Waterboer, Tim; Michels, Birgitta; Neves, Esmeralda; Iracema Morais, Cátia; London, Jonathan; Mestrallet, Stéphanie; Quartier Dit Maire, Pierre; Neven, Bénédicte; Rapaport, Franck; Seeleuthner, Yoann; Lev, Atar; Simon, Amos J; Montoya, Jorge; Barel, Ortal; Gómez-Rodríguez, Julio; Orrego, Julio C; L'Honneur, Anne-Sophie; Soudée, Camille; Rojas, Jessica; Velez, Alejandra C; Sereti, Irini; Terrier, Benjamin; Marin, Nancy; García, Luis F; Abel, Laurent; Boisson-Dupuis, Stéphanie; Reis, Joel; Marinho, Antonio; Lisco, Andrea; Faria, Emilia; Goodnow, Christopher C; Vasconcelos, Julia; Béziat, Vivien; Ma, Cindy S; Somech, Raz; Casanova, Jean-Laurent; Bustamante, Jacinta; Franco, Jose Luis; Tangye, Stuart G
The Journal of experimental medicine, 2024-May-06, Volume: 221, Issue: 5Journal Article
CD4+ T cells are vital for host defense and immune regulation. However, the fundamental role of CD4 itself remains enigmatic. We report seven patients aged 5-61 years from five families of four ancestries with autosomal recessive CD4 deficiency and a range of infections, including recalcitrant warts and Whipple's disease. All patients are homozygous for rare deleterious CD4 variants impacting expression of the canonical CD4 isoform. A shorter expressed isoform that interacts with LCK, but not HLA class II, is affected by only one variant. All patients lack CD4+ T cells and have increased numbers of TCRαβ+CD4-CD8- T cells, which phenotypically and transcriptionally resemble conventional Th cells. Finally, patient CD4-CD8- αβ T cells exhibit intact responses to HLA class II-restricted antigens and promote B cell differentiation in vitro. Thus, compensatory development of Th cells enables patients with inherited CD4 deficiency to acquire effective cellular and humoral immunity against an unexpectedly large range of pathogens. Nevertheless, CD4 is indispensable for protective immunity against at least human papillomaviruses and Trophyrema whipplei.
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