Germline SAMD9L truncation variants trigger global translational repression.
Germline SAMD9L truncation variants trigger global translational repression.
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DOI:
10.1084/jem.20201195
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发表时间:
2021-05-03
期刊:
影响因子:
--
通讯作者:
Rawlings DJ
中科院分区:
文献类型:
--
作者:
Allenspach EJ;Soveg F;Finn LS;So L;Gorman JA;Rosen ABI;Skoda-Smith S;Wheeler MM;Barrow KA;Rich LM;Debley JS;Bamshad MJ;Nickerson DA;Savan R;Torgerson TR;Rawlings DJ
Germline stop-gain variants in SAMD9L encode truncated gain-of-function proteins that result in a multisystem human disorder with autoinflammatory features. The interferon-inducible dominant proteins interfere with global protein synthesis via inhibition of translational elongation. SAMD9L is an interferon-induced tumor suppressor implicated in a spectrum of multisystem disorders, including risk for myeloid malignancies and immune deficiency. We identified a heterozygous de novo frameshift variant in SAMD9L in an infant with B cell aplasia and clinical autoinflammatory features who died from respiratory failure with chronic rhinovirus infection. Autopsy demonstrated absent bone marrow and peripheral B cells as well as selective loss of Langerhans and Purkinje cells. The frameshift variant led to expression of a truncated protein with interferon treatment. This protein exhibited a gain-of-function phenotype, resulting in interference in global protein synthesis via inhibition of translational elongation. Using a mutational scan, we identified a region within SAMD9L where stop-gain variants trigger a similar translational arrest. SAMD9L variants that globally suppress translation had no effect or increased mRNA transcription. The complex-reported phenotype likely reflects lineage-dominant sensitivities to this translation block. Taken together, our findings indicate that interferon-triggered SAMD9L gain-of-function variants globally suppress translation.
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