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Early onset combined immunodeficiency and autoimmunity in patients with loss-of-function mutation in LAT.


ABSTRACT: The adapter protein linker for activation of T cells (LAT) is a critical signaling hub connecting T cell antigen receptor triggering to downstream T cell responses. In this study, we describe the first kindred with defective LAT signaling caused by a homozygous mutation in exon 5, leading to a premature stop codon deleting most of the cytoplasmic tail of LAT, including the critical tyrosine residues for signal propagation. The three patients presented from early childhood with combined immunodeficiency and severe autoimmune disease. Unlike in the mouse counterpart, reduced numbers of T cells were present in the patients. Despite the reported nonredundant role of LAT in Ca(2+) mobilization, residual T cells were able to induce Ca(2+) influx and nuclear factor (NF) ?B signaling, whereas extracellular signal-regulated kinase (ERK) signaling was completely abolished. This is the first report of a LAT-related disease in humans, manifesting by a progressive combined immune deficiency with severe autoimmune disease.

SUBMITTER: Keller B 

PROVIDER: S-EPMC4925012 | biostudies-literature | 2016 Jun

REPOSITORIES: biostudies-literature

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Early onset combined immunodeficiency and autoimmunity in patients with loss-of-function mutation in LAT.

Keller Baerbel B   Zaidman Irina I   Yousefi O Sascha OS   Hershkovitz Dov D   Stein Jerry J   Unger Susanne S   Schachtrup Kristina K   Sigvardsson Mikael M   Kuperman Amir A AA   Shaag Avraham A   Schamel Wolfgang W WW   Elpeleg Orly O   Warnatz Klaus K   Stepensky Polina P  

The Journal of experimental medicine 20160530 7


The adapter protein linker for activation of T cells (LAT) is a critical signaling hub connecting T cell antigen receptor triggering to downstream T cell responses. In this study, we describe the first kindred with defective LAT signaling caused by a homozygous mutation in exon 5, leading to a premature stop codon deleting most of the cytoplasmic tail of LAT, including the critical tyrosine residues for signal propagation. The three patients presented from early childhood with combined immunodef  ...[more]

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