2. Academic Validation
  3. Hereditary systemic amyloidosis due to Asp76Asn variant β2-microglobulin

Hereditary systemic amyloidosis due to Asp76Asn variant β2-microglobulin

  • N Engl J Med. 2012 Jun 14;366(24):2276-83. doi: 10.1056/NEJMoa1201356.
Sophie Valleix 1,  Julian D Gillmore,  Frank Bridoux,  Palma P Mangione,  Ahmet Dogan,  Brigitte Nedelec,  Mathieu Boimard,  Guy Touchard,  Jean-Michel Goujon,  Corinne Lacombe,  Pierre Lozeron,  David Adams,  Catherine Lacroix,  Thierry Maisonobe,  Violaine Planté-Bordeneuve,  Julie A Vrana,  Jason D Theis,  Sofia Giorgetti,  Riccardo Porcari,  Stefano Ricagno,  Martino Bolognesi,  Monica Stoppini,  Marc Delpech,  Mark B Pepys,  Philip N Hawkins,  Vittorio Bellotti
Affiliations

Affiliation

  • 1 Laboratoire de Biochimie et de Génétique Moléculaire, Université Paris-Descartes, Sorbonne Paris Cité, Faculté de Médecine Paris, Assistance Public–Hôpitaux de Paris (AP-HP), Paris, France. [email protected]
PMID: 22693999 DOI: 10.1056/NEJMoa1201356
Abstract

We describe a kindred with slowly progressive gastrointestinal symptoms and autonomic neuropathy caused by autosomal dominant, hereditary systemic amyloidosis. The amyloid consists of Asp76Asn variant β(2)-microglobulin. Unlike patients with dialysis-related amyloidosis caused by sustained high plasma concentrations of wild-type β(2)-microglobulin, the affected members of this kindred had normal renal function and normal circulating β(2)-microglobulin values. The Asp76Asn β(2)-microglobulin variant was thermodynamically unstable and remarkably fibrillogenic in vitro under physiological conditions. Previous studies of β(2)-microglobulin aggregation have not shown such amyloidogenicity for single-residue substitutions. Comprehensive biophysical characterization of the β(2)-microglobulin variant, including its 1.40-Å, three-dimensional structure, should allow further elucidation of fibrillogenesis and protein misfolding.

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