Movement disorders : official journal of the Movement Disorder Society · 2024
Rare Missense Variants in KCNJ10 Are Associated with Paroxysmal Kinesigenic Dyskinesia.
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Wirth Thomas, Roze Emmanuel, Delvallée Clarisse, Trouillard Oriane, Drouot Nathalie, Damier Philippe, Boulay Clotilde, Bourgninaud Marine, Jegatheesan Prasanthi, Sangare Aude, Forlani Sylvie, Gaymard Bertrand, Hervochon Remi, Navarro Vincent, Calmels Nadège, Schalk Audrey, Tranchant Christine, Piton Amélie, Méneret Aurélie, Anheim Mathieu
Аннотация
BACKGROUND: Although the group of paroxysmal kinesigenic dyskinesia (PKD) genes is expanding, the molecular cause remains elusive in more than 50% of cases.
OBJECTIVE: The aim is to identify the missing genetic causes of PKD.
METHODS: Phenotypic characterization, whole exome sequencing and association test were performed among 53 PKD cases.
RESULTS: We identified four causative variants in KCNJ10, already associated with EAST syndrome (epilepsy, cerebellar ataxia, sensorineural hearing impairment and renal tubulopathy). Homozygous p.(Ile209Thr) variant was found in two brothers from a single autosomal recessive PKD family, whereas heterozygous p.(Cys294Tyr) and p.(Thr178Ile) variants were found in six patients from two autosomal dominant PKD families. Heterozygous p.(Arg180His) variant was identified in one additional sporadic PKD case. Compared to the Genome Aggregation Database v2.1.1, our PKD cohort was significantly enriched in both rare heterozygous (odds ratio, 21.6; P = 9.7 × 10-8) and rare homozygous (odds ratio, 2047; P = 1.65 × 10-6) missense variants in KCNJ10.
CONCLUSIONS: We demonstrated that both rare monoallelic and biallelic missense variants in KCNJ10 are associated with PKD. © 2024 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.
OBJECTIVE: The aim is to identify the missing genetic causes of PKD.
METHODS: Phenotypic characterization, whole exome sequencing and association test were performed among 53 PKD cases.
RESULTS: We identified four causative variants in KCNJ10, already associated with EAST syndrome (epilepsy, cerebellar ataxia, sensorineural hearing impairment and renal tubulopathy). Homozygous p.(Ile209Thr) variant was found in two brothers from a single autosomal recessive PKD family, whereas heterozygous p.(Cys294Tyr) and p.(Thr178Ile) variants were found in six patients from two autosomal dominant PKD families. Heterozygous p.(Arg180His) variant was identified in one additional sporadic PKD case. Compared to the Genome Aggregation Database v2.1.1, our PKD cohort was significantly enriched in both rare heterozygous (odds ratio, 21.6; P = 9.7 × 10-8) and rare homozygous (odds ratio, 2047; P = 1.65 × 10-6) missense variants in KCNJ10.
CONCLUSIONS: We demonstrated that both rare monoallelic and biallelic missense variants in KCNJ10 are associated with PKD. © 2024 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.