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Gain-of-function mutations amplify cytotoxic FAM111 protease activity in human genetic disorders

biorxiv. 2020; 
Saskia Hoffmann,  Satyakrishna Pentakota,  Andreas Mund,  Peter Haahr,  Fabian Coscia,  Marta Gallo,  Matthias Mann,  Nicholas M. I. Taylor,  Niels Mailand
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Catalog Antibody Antibodies used for immunoblotting included: acetylated a-Tubulin (acetyl K40, ab24610, Abcam (1:5,000 dilution)), Actin (MAB1501, Millipore (1:20,000)), Cleaved Caspase-3 (Asp175, 9661, Cell Signaling (1:1,000)), CTCF (A300-543A, Bethyl (1:500)), FAM111A (ab184572, Abcam (1:1,000)), FAM111B (HPA038637, Sigma (1:2,000)), FLAG (A00187, GenScript (1:1,000)), GFP (11814460001, Roche (1:500)) and sc-8334, Santa Cruz (1:1,000)), GTFC1 (A301-292A, Bethyl (1:1,000)), histone H2AX (2595, Cell Signaling (1:1,000)), IFI-16 (sc-8023, Santa Cruz (1:500)), MCM2 (610701, Clone 46/BM28, BD Transduction Lab (1:1,000)), P53 (sc-126, Santa Cruz (1:1,000)), PARP-1 (sc8007, Santa Cruz (1:500)), PCNA (sc-56, Santa Cruz (1:1,000)), RFC1 (ab3566, Abcam (1:1,000)), RFC3 (ab154899, Abcam (1:1,000)), RFC5 (A300-146A, Bethyl (1:1,000)), TBCE (A305-485A, Bethyl (1:1,000)), tubulin alpha (T9026, Sigma-Aldrich (1:5,000)), Vinculin (V9131, Sigma (1:10,000)). Get A Quote

摘要

Dominant missense mutations in the human serine protease FAM111A underlie perinatally lethal gracile bone dysplasia and Kenny-Caffey syndrome 1–3, yet how FAM111A mutations lead to disease is not known. We show that FAM111A proteolytic activity suppresses DNA replication and transcription by displacing key effectors of these processes from chromatin, triggering rapid programmed cell death by Caspase-dependent apoptosis to potently undermine cell viability. Patient-associated point mutations in FAM111A exacerbate these phenotypes by hyperactivating its intrinsic protease activity. Moreover, FAM111A forms a complex with the uncharacterized homologous serine protease FAM111B, point mutations in which cause a ... More

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