{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T14:19:04Z","timestamp":1787840344624,"version":"build-2784847793"},"reference-count":23,"publisher":"Oxford University Press (OUP)","issue":"12","license":[{"start":{"date-parts":[[2020,11,27]],"date-time":"2020-11-27T00:00:00Z","timestamp":1606435200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"name":"University Hospital Essen"},{"name":"DFG Research Unit","award":["FOR2488"],"award-info":[{"award-number":["FOR2488"]}]},{"name":"FWO-FKM","award":["1861419N"],"award-info":[{"award-number":["1861419N"]}]},{"name":"Telethon Network of Genetic Biobanks","award":["GTB18001"],"award-info":[{"award-number":["GTB18001"]}]},{"name":"EuroBioBank network"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,12,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>KCNN2 encodes the small conductance calcium-activated potassium channel 2 (SK2). Rodent models with spontaneous Kcnn2 mutations show abnormal gait and locomotor activity, tremor and memory deficits, but human disorders related to KCNN2 variants are largely unknown. Using exome sequencing, we identified a de novo KCNN2 frameshift deletion in a patient with learning disabilities, cerebellar ataxia and white matter abnormalities on brain MRI. This discovery prompted us to collect data from nine additional patients with de novo KCNN2 variants (one nonsense, one splice site, six missense variants and one in-frame deletion) and one family with a missense variant inherited from the affected mother. We investigated the functional impact of six selected variants on SK2 channel function using the patch-clamp technique. All variants tested but one, which was reclassified to uncertain significance, led to a loss-of-function of SK2 channels. Patients with KCNN2 variants had motor and language developmental delay, intellectual disability often associated with early-onset movement disorders comprising cerebellar ataxia and\/or extrapyramidal symptoms. Altogether, our findings provide evidence that heterozygous variants, likely causing a haploinsufficiency of the KCNN2 gene, lead to novel autosomal dominant neurodevelopmental movement disorders mirroring phenotypes previously described in rodents.<\/jats:p>","DOI":"10.1093\/brain\/awaa346","type":"journal-article","created":{"date-parts":[[2020,9,21]],"date-time":"2020-09-21T19:23:05Z","timestamp":1600716185000},"page":"3564-3573","source":"Crossref","is-referenced-by-count":53,"title":["Variants in the SK2 channel gene (<i>KCNN2<\/i>) lead to dominant neurodevelopmental movement disorders"],"prefix":"10.1093","volume":"143","author":[{"given":"Fanny","family":"Mochel","sequence":"first","affiliation":[{"name":"Institut du Cerveau et de la Moelle \u00e9pini\u00e8re (ICM), Sorbonne Universit\u00e9, UMR S 1127, Inserm U1127, CNRS UMR 7225, F-75013 Paris, France"},{"name":"AP-HP, H\u00f4pital Piti\u00e9-Salp\u00eatri\u00e8re, D\u00e9partement de G\u00e9n\u00e9tique and Centre de 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