Evidence map›Paper›PMID 39831730›Full record

ArticleMovement disorders : official journal of the Movement Disorder Society2025

An X-Linked Ataxia Syndrome in a Family with Hearing Loss Associated with a Novel Variant in the BCAP31 Gene.

Martin Paucar, Tianyi Li, Åsa Bergendal, Irina Savitcheva, Kaveh Pourhamidi, José M Laffita-Mesa, Ann Nordgren, Martin Engvall, Per Uhlén, Kristina Lagerstedt-Robinson and 1 more

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In one paragraph

Article in Movement disorders : official journal of the Movement Disorder Society, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.

0numbers the graph read from it
0cells of the map it votes in
4citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

4 citing papers in PubMed.

  1. Article
  2. Expanding the Spectrum ofNeurology. Genetics · 2026
    Article
  3. Article
  4. Review
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

11 authors.

Martin PaucarDepartment of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.
Tianyi LiDepartment of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.
Åsa BergendalDepartment of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.
Irina SavitchevaDepartment of Medical Radiation Physics and Nuclear Medicine, Karolinska University Hospital, Stockholm, Sweden.
Kaveh PourhamidiDepartment of Neurophysiology, Karolinska University Hospital, Stockholm, Sweden.
José M Laffita-MesaDepartment of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.
Ann NordgrenDepartment of Clinical Genetics and Genomics, Karolinska University Hospital, Stockholm, Sweden.
Martin EngvallDepartment of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden.
Per UhlénDepartment of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden.
Kristina Lagerstedt-RobinsonDepartment of Clinical Genetics and Genomics, Karolinska University Hospital, Stockholm, Sweden.
Per SvenningssonDepartment of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.ORCID 0000-0001-6727-3802

Funding

NeuroförbundetRegion StockholmStiftelsen Promobilia
6 · The paper itself

Abstract

objectivePathogenic variants in B-cell receptor-associated protein (BCAP31) are associated with X-linked, deafness, dystonia and cerebral hypomyelination (DDCH) syndrome. DDCH is congenital and non-progressive, featuring severe intellectual disability (ID), variable dysmorphism, and sometimes associated with shortened survival. BCAP31 encodes one of the most abundant chaperones, with several functions including acting as a negative regulator of endoplasmic reticulum (ER) calcium ion (Ca

methodsEvaluation of motor features, neuroimaging studies, neurophysiological, and cognitive tests. Whole exome sequencing (WES) was applied, a plasmid encoding BCAP31 with and without a candidate variant was transfected into SH-SY5Y cells to assess subcellular location and to measure Ca

resultsAdult-onset ataxia, cognitive impairment, and hearing loss leading to deafness are the predominant features. Reduced penetrance, slow progression with preserved ability to walk in advance age, and universal cerebellar atrophy are other features for this syndrome. This condition is associated with the new variant c.22G>A (V8I) in BCAP31 at Xq28. The subcellular location of the V8I BCAP31 protein was not altered but caused significant elevation of cytosolic Ca

conclusionsOur findings expand the spectrum of variants in BCAP31 from neurodevelopmental syndromes to include a progressive neurodegenerative disease with variable expressivity. This is the first time ataxia is described in association with a BCAP31 variant and functional evidence of pathogenicity is provided. Additional BCAP31 cases featuring ataxia are needed to establish an association. © 2025 The Author(s). Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society.

Indexed as

AtaxiaCalcium-Binding ProteinsGenetic Diseases, X-LinkedHearing LossAdultFemaleHumansMaleMembrane ProteinsMiddle AgedPedigreeBCAP31 protein, humanCalcium-Binding ProteinsMembrane ProteinsBCAP31hearing lossX‐linked ataxia

Identifiers

PMID39831730
PMCPMC12006879

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.