Matthew B Johnson, Masato Ogishi, Clara Domingo-Vila, Elisa De Franco, Matthew N Wakeling, Zineb Imane, Brittany Resnick, Evangelia Williams, Rui Pedro Galão, Richard Caswell, James Russ-Silsby, Yoann Seeleuthner, Darawan Rinchai, Iris Fagniez, Basilin Benson, Matthew J Dufort, Cate Speake, Megan E Smithmyer, Michelle Hudson, Rebecca Dobbs, Zoe Quandt, Andrew T Hattersley, Peng Zhang, Stephanie Boisson-Dupuis, Mark S Anderson, Jean-Laurent Casanova, Timothy I Tree, Richard A Oram
We previously reported two siblings with inherited PD-1 deficiency who died from autoimmune pneumonitis at 3 and 11 years of age after developing other autoimmune manifestations, including type 1 diabetes (T1D). We report here two siblings, aged 10 and 11 years, with neonatal-onset T1D (diagnosed at the ages of 1 day and 7 wk), who are homozygous for a splice-site variant of CD274 (encoding PD-L1). This variant results in the exclusive expression of an alternative, loss-of-function PD-L1 protein isoform in overexpression experiments and in the patients' primary leukocytes...
June 3, 2024: Journal of Experimental Medicine