ADCY5-related dyskinesia - case series with literature review.

Abstract

Introduction: ADCY5-related dyskinesia is a rare neurological disease caused by mutations in the gene encoding the adenylyl cyclase 5 (ADCY5) isoform, a protein that plays an important role in intracellular transmission. Variants in ADCY5 are associated with a spectrum of neurological disease encompassing dyskinesia, chorea, and dystonia. State of the-art. ADCY5 mutations result in clinically heterogeneous manifestations which comprise a range of core and less to highly variable symptoms. Due to the heterogeneous nature and difficulty in diagnosis of the disorder, available treatments are highly limited.

Clinical implications: ADCY5-related dyskinesia was reported in 52 individuals in the literature over a five-year period (January 2017 to January 2022). We have listed all the symptoms and their frequency. The most common symptom reported in these patients was dystonia. Over 50% of patients developed dyskinesia and chorea. We report two cases of familial occurrence of symptomatic ADCY5-related dyskinesia. A 45-year-old patient presented with involuntary movements which had been occurring since childhood. The proband's neurological examination revealed dysarthria, involuntary myoclonic twitches, and choreic movements. The patient's 9-year-old son had developed involuntary movements, mainly chorea and dystonia.

Future directions: This paper aims to summarise the recent literature on ADCY5-related neurological disorders and to present a new case of a Polish family with ADCY5 mutation. Genetic diagnostics are important in the context of possible future targeted treatments.