De novo CTBP1 variant is associated with decreased mitochondrial respiratory chain activities

Ewen W. Sommerville, Charlotte L. Alston, Angela Pyle, Langping He, Gavin Falkous, Karen Naismith, Patrick F. Chinnery, Robert McFarland, Robert W. Taylor (Lead / Corresponding author)

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    Abstract

    Objective: To determine the genetic etiology of a young woman presenting an early-onset, progressive neurodegenerative disorder with evidence of decreased mitochondrial complex I and IV activities in skeletal muscle suggestive of a mitochondrial disorder.

    Methods: A case report including diagnostic workup, whole-exome sequencing of the affected patient, filtering, and prioritization of candidate variants assuming a suspected autosomal recessive mitochondrial disorder and segregation studies.

    Results: After excluding candidate variants for an autosomal recessive mitochondrial disorder, re-evaluation of rare and novel heterozygous variants identified a recently reported, recurrent pathogenic heterozygous CTBP1 missense change (c.991C>T, p.Arg331Trp), which was confirmed to have arisen de novo.

    Conclusions: We report the fifth known patient harboring a recurrent pathogenic de novo c.991C>T p.(Arg331Trp) CTBP1 variant, who was initially suspected to have an autosomal recessive mitochondrial disorder. Inheritance of suspected early-onset mitochondrial disease could wrongly be assumed to be autosomal recessive. Hence, this warrants continued re-evaluation of rare and novel heterozygous variants in patients with apparently unsolved suspected mitochondrial disease investigated using next-generation sequencing.

    Original languageEnglish
    Article numbere187
    Pages (from-to)1-6
    Number of pages6
    JournalNeurology Genetics
    Volume3
    Issue number5
    Early online date22 Sep 2017
    DOIs
    Publication statusPublished - Oct 2017

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  • Cite this

    Sommerville, E. W., Alston, C. L., Pyle, A., He, L., Falkous, G., Naismith, K., Chinnery, P. F., McFarland, R., & Taylor, R. W. (2017). De novo CTBP1 variant is associated with decreased mitochondrial respiratory chain activities. Neurology Genetics, 3(5), 1-6. [e187]. https://doi.org/10.1212/NXG.0000000000000187