De Franco, ElisaFlanagan, Sarah E.Yagi, TakuyaAbreu, DamienMahadevan, JanaJohnson, Matthew B.Jones, GaranAcosta, FernandaMulaudzi, M.C. (Mphelekedzeni)Lek, NgeeOh, VeraPetz, OliverCaswell, RichardEllard, SianUrano, FumihikoHattersley, Andrew T.2018-01-172018-01-172017-07De Franco E., Flanagan S.E., Yagi T. et al. 2017, 'Dominant ER stress-inducing WFS1 mutations underlie a genetic syndrome of neonatal/infancy-onset diabetes, congenital sensorineural deafness, and congenital cataracts', Diabetes, vol. 66, no. 7, pp. 2044-2053.0012-1797 (print)1939-327X (online)10.2337/db16-1296http://hdl.handle.net/2263/63576Neonatal diabetes is frequently part of a complex syndrome with extra-pancreatic features: 18 genes causing syndromic neonatal diabetes have been identified to date. There remain patients with neonatal diabetes who have novel genetic syndromes. We performed exome sequencing in a patient and his unrelated, unaffected parents to identify the genetic aetiology of a syndrome characterized by neonatal diabetes, sensorineural deafness and congenital cataracts. Further testing was performed in 311 patients with diabetes diagnosed before 1 year of age in whom all known genetic causes had been excluded. We identified 5 patients, including the initial case, with 3 heterozygous missense mutations in WFS1 (4/5 confirmed de novo). They had diabetes diagnosed before 12 months (2 before 6 months) (5/5), sensorineural deafness diagnosed soon after birth (5/5), congenital cataracts (4/5) and hypotonia (4/5). In vitro studies showed that these WFS1 mutations are functionally different from known recessive Wolfram syndrome-causing mutations, as they tend to aggregate and induce robust endoplasmic reticulum stress. Our results establish specific dominant WFS1 mutations as a cause of a novel syndrome including neonatal/infancy onset diabetes, congenital cataracts, and sensorineural deafness. This syndrome has a discrete pathophysiology and differs genetically and clinically from recessive Wolfram syndrome.en© 2017 by the American Diabetes AssociationCongenital cataractsCongenital sensorineural deafnessInfancy-onset diabetesNeonatal diabetesER stress–inducing WFS1 mutationsPostprint Article