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JMD : Journal of Movement Disorders



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3 "Vikram V Holla"
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Letter to the editor
Dystonic Opisthotonus in Kufor-Rakeb Syndrome: Expanding the Phenotypic and Genotypic Spectrum
Sandeep Gurram, Vikram V Holla, Riyanka Kumari, Debjyoti Dhar, Nitish Kamble, Ravi Yadav, Babylakshmi Muthusamy, Pramod Kumar Pal
J Mov Disord. 2023;16(3):343-346.   Published online July 25, 2023
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PDFSupplementary Material
Original Article
KMT2B-Related Dystonia in Indian Patients With Literature Review and Emphasis on Asian Cohort
Debjyoti Dhar, Vikram V Holla, Riyanka Kumari, Neeharika Sriram, Jitender Saini, Ravi Yadav, Akhilesh Pandey, Nitish Kamble, Babylakshmi Muthusamy, Pramod Kumar Pal
J Mov Disord. 2023;16(3):285-294.   Published online June 13, 2023
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AbstractAbstract PDFSupplementary Material
aaMutations in the KMT2B gene have been identified in patients previously diagnosed with idiopathic dystonia. Literature on KMT2B-related dystonia is sparse in the Indian and Asian populations.
aaWe report seven patients with KMT2B-related dystonia studied prospectively from May 2021 to September 2022. Patients underwent deep clinical phenotyping and genetic testing by whole-exome sequencing (WES). A systematic literature search was performed to identify the spectrum of previously published KMT2B-related disorders in the Asian subcontinent.
aaThe seven identified patients with KMT2B-related dystonia had a median age at onset of four years. The majority experienced onset in the lower limbs (n = 5, 71.4%), with generalization at a median duration of 2 years. All patients except one had complex phenotypes manifesting as facial dysmorphism (n = 4), microcephaly (n = 3), developmental delay (n = 3), and short stature (n = 1). Magnetic resonance imaging (MRI) abnormalities were present in four cases. WES revealed novel mutations in the KMT2B gene in all patients except one. Compared to the largest cohort of patients with KMT2B-related disorders, the Asian cohort, comprising 42 patients, had a lower prevalence of female patients, facial dysmorphism, microcephaly, intellectual disability, and MRI abnormalities. Protein-truncating variants were more prevalent than missense variants. While microcephaly and short stature were more common in patients with missense mutations, facial dysmorphism was more common in patients with truncating variants. Deep brain stimulation, performed in 17 patients, had satisfactory outcomes.
aaThis is the largest series of patients with KMT2B-related disorders from India, further expanding the clinico-genotypic spectrum. The extended Asian cohort emphasizes the unique attributes of this part of the world.
Letter to the editor
Myoclonus-Dystonic Presentation of Childhood Onset DYT-GCH1: A Report From India
Praveen Sharma, Vikram V Holla, Sandeep Gurram, Nitish Kamble, Ravi Yadav, Pramod Kumar Pal
J Mov Disord. 2023;16(1):101-103.   Published online January 12, 2023
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Citations to this article as recorded by  
  • A Genetics Pearl for Counseling Patients with Epsilon-Sarcoglycan Myoclonus-Dystonia
    Alissa S. Higinbotham, Suzanne D. DeBrosse, Camilla W. Kilbane
    Tremor and Other Hyperkinetic Movements.2023;[Epub]     CrossRef

JMD : Journal of Movement Disorders