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Disco-Interacting Protein 2 Homolog B CGG Repeat Expansion in Siblings with Neurodevelopmental Disability and

Emilie T Théberge¹, Kate Durbano², Diane Demailly³

¹Department of Medical Genetics, University of British Columbia, Vancouver, British Columbia, Canada.

Movement Disorders : Official Journal of the Movement Disorder Society

|January 24, 2025

Abstract

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.

Keywords:

CGG repeat expansion developmental delay disco‐interacting protein 2 homolog B (DIP2B)intellectual disability movement disorder

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