Adult Onset of Pyruvate Dehydrogenase Deficiency Presenting with Dystonia and Chorea in Female Patient from India - A Very Rare Case

Abstract

We reported a very rare case of pyruvate dehydrogenase complex E1α (PDHA1) gene deficiency presenting as cervical dystonia and chorea in an adult female patient from India. Patient was presented with a history of involuntary rhythmic repetitive movements of both hands, legs, and head, lips and stammering of speech with tilting of neck to one side along with orofacial dyskinetic movements since past 6 years and gait changes since past 4 years. Her symptoms were progressive in nature. Her physical examination and systemic examinations were normal. Neurological examinations suggestive of cervical dystonia with chorea form movements. Brain MRI investigations revealed marked atrophy of bilateral caudate nuclei and putamina. Patient had a familial history of father and second brother had mild hand tremors. Patient has been referred for whole exome sequencing. The exome data analysis identified a very rare and unusual heterozygous indel variant c.-20_-19delinsCT, (chrX:19344018_19344019delinsCT) in 5’UTR region of PDHA1 gene caused late phenotypic onset of cervical dystonia as major clinical manifestation of PDHA1 deficiency along with chorea form movement disorders at the age of 24 year. In conclusion, to the best of our literature knowledge this is the novel and unusual case of adult female patient wherein we are reporting a novel heterozygous indel variant c.-20_-19delinsCT, (chrX:19344018_19344019delinsCT) in 5’UTR region of PDHA1 gene responsible for PDHA1 deficiency presenting with cervical dystonia and chorea as major clinical manifestations. Hence, dystonia and chorea as major clinical manifestations of PDH deficiency could be considered in adult patients also rather than only in paediatric patients.