Abstract
We describe humans with rare biallelic loss-of-function PTCRA variants impairing pre-a T cell receptor (pre-TCRa) expression. Low circulating naive a|! T cell counts at birth persisted over time, with normal memory a|>, and high T5 T cell counts. Their TCRa repertoire was biased, which suggests that noncanonical thymic differentiation pathways can rescue aft T cell development. Only a minority of these individuals were sick, with infection, lymphoproliferation, and/or autoimmunity. We also report that 1 in 4000 individuals from the Middle East and South Asia are homozygous for a common hypomorphic PTCRA variant. They had normal circulating naive aft T cell counts but high yS T cell counts. Although residual pre-TCRa expression drove the differentiation of more ap T cells, autoimmune conditions were more frequent in these patients compared with the general population.
Original language | English |
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Article number | adh4059 |
Journal | Science |
Volume | 383 |
Issue number | 6686 |
DOIs | |
State | Published - 1 Mar 2024 |
Funding Agency
- Kuwait Foundation for the Advancement of Sciences