Frontiers in Immunology (Aug 2023)

Identification of eight novel proteasome variants in five unrelated cases of proteasome-associated autoinflammatory syndromes (PRAAS)

  • Jonas Johannes Papendorf,
  • Frédéric Ebstein,
  • Sara Alehashemi,
  • Daniela Gerent Petry Piotto,
  • Anna Kozlova,
  • Maria Teresa Terreri,
  • Anna Shcherbina,
  • Andre Rastegar,
  • Marta Rodrigues,
  • Renan Pereira,
  • Sophia Park,
  • Bin Lin,
  • Kat Uss,
  • Sophie Möller,
  • Ana Flávia da Silva Pina,
  • Flavio Sztajnbok,
  • Sofia Torreggiani,
  • Julie Niemela,
  • Jennifer Stoddard,
  • Sergio D. Rosenzweig,
  • Andrew J. Oler,
  • Colton McNinch,
  • Marietta M. de Guzman,
  • Adriana Fonseca,
  • Nicole Micheloni,
  • Melissa Mariti Fraga,
  • Sandro Félix Perazzio,
  • Raphaela Goldbach-Mansky,
  • Adriana A. de Jesus,
  • Elke Krüger

DOI
https://doi.org/10.3389/fimmu.2023.1190104
Journal volume & issue
Vol. 14

Abstract

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Mutations in genes coding for proteasome subunits and/or proteasome assembly helpers typically cause recurring autoinflammation referred to as chronic atypical neutrophilic dermatosis with lipodystrophy and elevated temperatures (CANDLE) or proteasome-associated autoinflammatory syndrome (PRAAS). Patients with CANDLE/PRAAS present with mostly chronically elevated type I interferon scores that emerge as a consequence of increased proteotoxic stress by mechanisms that are not fully understood. Here, we report on five unrelated patients with CANDLE/PRAAS carrying novel inherited proteasome missense and/or nonsense variants. Four patients were compound heterozygous for novel pathogenic variants in the known CANDLE/PRAAS associated genes, PSMB8 and PSMB10, whereas one patient showed additive loss-of-function mutations in PSMB8. Variants in two previously not associated proteasome genes, PSMA5 and PSMC5, were found in a patient who also carried the PSMB8 founder mutation, p.T75M. All newly identified mutations substantially impact the steady-state expression of the affected proteasome subunits and/or their incorporation into mature 26S proteasomes. Our observations expand the spectrum of PRAAS-associated genetic variants and improve a molecular diagnosis and genetic counseling of patients with sterile autoinflammation.

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