• Isabelle Le Ber, Agnès Camuzat, Rita Guerreiro, Kawtar Bouya-Ahmed, Jose Bras, Gael Nicolas, Audrey Gabelle, Mira Didic, Anne De Septenville, Stéphanie Millecamps, Timothée Lenglet, Morwena Latouche, Edor Kabashi, Dominique Campion, Didier Hannequin, John Hardy, Alexis Brice, and French Clinical and Genetic Research Network on FTD/FTD-ALS.
• INSERM, UMR_S975, Centre de Recherche de l'Institut du Cerveau et de la Moelle Epinière, Hôpital de la Salpêtrière, F-75013, Paris, France2Université Pierre Marie Curie-Paris 06, UMR_S975, F-75013, Paris, France3Centre national de la recherche scientifique, UMR 7225, F-75013, Paris, France4AP-HP, Hôpital de la Pitié-Salpêtrière, Centre de Référence des Démences Rares, Paris, France5AP-HP, Hôpital de la Pitié-Salpêtrière, Département des maladies du système nerveux, Paris, France.

ImportanceMutations in the SQSTM1 gene, coding for p62, are a cause of Paget disease of bone and amyotrophic lateral sclerosis (ALS). Recently, SQSTM1 mutations were confirmed in ALS, and mutations were also identified in 3 patients with frontotemporal dementia (FTD), suggesting a role for SQSTM1 in FTD.ObjectiveTo evaluate the exact contribution of SQSTM1 to FTD and FTD with ALS (FTD-ALS) in an independent cohort of patients.DesignA SQSTM1 mutation was first identified in a multiplex family with FTD by use of whole-exome sequencing. To evaluate the frequency of SQSTM1 mutations, we sequenced this gene in a cohort of patients with FTD or FTD-ALS, with no mutations in known FTD and ALS genes.SettingPrimary care or referral center.ParticipantsAn overall cohort of 188 French patients, including 132 probands with FTD and 56 probands with FTD-ALS.Main Outcomes And MeasuresFrequency of SQSTM1 mutations in patients with FTD or FTD-ALS; description of associated phenotypes.ResultsWe identified 4 heterozygous missense mutations in 4 unrelated families with FTD; only 1 family had clinical symptoms of Paget disease of bone, and only 1 family had clinical symptoms of FTD-ALS, possibly owing to the low penetrance of some of the clinical manifestations.Conclusions And RelevanceAlthough the frequency of the mutations is low in our series (4 of 188 patients [2%]), our results, similar to those already reported, support a direct pathogenic role of p62 in different types of FTD.

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