De novo DHDDS variants cause a neurodevelopmental and neurodegenerative disorder with myoclonus
Galosi S, Edani BH, Martinelli S, Hansikova H, Eklund EA, Caputi C, Masuelli L, Corsten-Janssen N, Srour M, Oegema R, Bosch DGM, Ellis CA, Amlie-Wolf L, Accogli A, Atallah I, Averdunk L, Barañano KW, Bei R, Bagnasco I, Brusco A, Demarest S, Alaix AS, Di Bonaventura C, Distelmaier F, Elmslie F, Gan-Or Z, Good JM, Gripp K, Kamsteeg EJ, Macnamara E, Marcelis C, Mercier N, Peeden J, Pizzi S, Pannone L, Shinawi M, Toro C, Verbeek NE, Venkateswaran S, Wheeler PG, Zdrazilova L, Zhang R, Zorzi G, Guerrini R, Sessa WC, Lefeber DJ, Tartaglia M, Hamdan FF, Grabińska KA, Leuzzi V. De novo DHDDS variants cause a neurodevelopmental and neurodegenerative disorder with myoclonus. Brain 2021, 145: 208-223. PMID: 34382076, PMCID: PMC8967098, DOI: 10.1093/brain/awab299.Peer-Reviewed Original ResearchConceptsRetinitis pigmentosaNeurodegenerative disordersMovement disordersDe novo pathogenic variantsHypokinetic movement disordersCongenital disorderLong-term outcomesNeurodevelopmental disordersNovo pathogenic variantsNeuronal ceroid lipofuscinosisProgressive myoclonus epilepsyDisease courseNeurological declineClinical featuresProgressive encephalopathyPsychiatric disturbancesMyelinated fibersLarge cohortCortical tremorCognitive deteriorationDisease-causing variantsEndosomal-lysosomal pathwayAutosomal recessive formPathogenic variantsAltered lysosomesProgressive myoclonus epilepsies—Residual unsolved cases have marked genetic heterogeneity including dolichol-dependent protein glycosylation pathway genes
Courage C, Oliver KL, Park EJ, Cameron JM, Grabińska KA, Muona M, Canafoglia L, Gambardella A, Said E, Afawi Z, Baykan B, Brandt C, di Bonaventura C, Chew HB, Criscuolo C, Dibbens LM, Castellotti B, Riguzzi P, Labate A, Filla A, Giallonardo AT, Berecki G, Jackson CB, Joensuu T, Damiano JA, Kivity S, Korczyn A, Palotie A, Striano P, Uccellini D, Giuliano L, Andermann E, Scheffer IE, Michelucci R, Bahlo M, Franceschetti S, Sessa WC, Berkovic SF, Lehesjoki AE. Progressive myoclonus epilepsies—Residual unsolved cases have marked genetic heterogeneity including dolichol-dependent protein glycosylation pathway genes. American Journal Of Human Genetics 2021, 108: 722-738. PMID: 33798445, PMCID: PMC8059372, DOI: 10.1016/j.ajhg.2021.03.013.Peer-Reviewed Original ResearchConceptsPME genesProgressive myoclonus epilepsyWhole-exome sequencingPrevious genetic analysisGroup of genesVariety of proteinsPrevious disease associationsUnrelated individualsCopy number changesProtein glycosylationPathway genesEndosomal functionGenetic analysisDisease-causing variantsGenesLikely disease-causing variantsAdditional family membersGenetic heterogeneityHeterogeneous rare diseasesUnsolved casesDisease associationsNovel causeMyoclonus epilepsyHeterozygous variantsHomozygous variant