Movement disorders : official journal of the Movement Disorder Society · 2025
Disco-Interacting Protein 2 Homolog B CGG Repeat Expansion in Siblings with Neurodevelopmental Disability and Progressive Movement Disorder.
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Théberge Emilie T, Durbano Kate, Demailly Diane, Huby Sophie, Mitina Aleksandra, Yin Yue, Mohajeri Arezoo, Care4Rare Canada Consortium, van Karnebeek Clara, Horvath Gabriella A, Yuen Ryan K C, Usdin Karen, Lehman Anna, Cif Laura, Richmond Phillip A
Аннотация
BACKGROUND: Trinucleotide repeat expansions are an emerging class of genetic variants associated with various movement disorders. Unbiased genome-wide analyses can reveal novel genotype-phenotype associations and provide a diagnosis for patients and families.
OBJECTIVE: The aim was to identify the genetic cause of a severe progressive movement disorder phenotype in 2 affected brothers.
METHODS: A family of 2 affected brothers and unaffected parents had extensive phenotyping since birth. Whole-genome and long-read sequencing methods characterized genetic variants and methylation status.
RESULTS: Two male siblings with a CGG repeat expansion in the 5'-untranslated region (UTR) of disco-interacting protein 2 homolog B (DIP2B) presented with a novel DIP2B phenotype, including neurodevelopmental disability, dysmorphic traits, and a severe progressive movement disorder (chorea, dystonia, and ataxia).
CONCLUSIONS: This is the first report of a severe progressive movement disorder phenotype associated with a CGG repeat expansion in the DIP2B 5'-UTR. © 2025 International Parkinson and Movement Disorder Society. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.
OBJECTIVE: The aim was to identify the genetic cause of a severe progressive movement disorder phenotype in 2 affected brothers.
METHODS: A family of 2 affected brothers and unaffected parents had extensive phenotyping since birth. Whole-genome and long-read sequencing methods characterized genetic variants and methylation status.
RESULTS: Two male siblings with a CGG repeat expansion in the 5'-untranslated region (UTR) of disco-interacting protein 2 homolog B (DIP2B) presented with a novel DIP2B phenotype, including neurodevelopmental disability, dysmorphic traits, and a severe progressive movement disorder (chorea, dystonia, and ataxia).
CONCLUSIONS: This is the first report of a severe progressive movement disorder phenotype associated with a CGG repeat expansion in the DIP2B 5'-UTR. © 2025 International Parkinson and Movement Disorder Society. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.