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Human Genome Variation
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Duplication of 4-bp in SACS leads to autosomal recessive spastic ataxia of Charlevoix–Saguenay type in two Pakistani patients
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  • Published: 28 April 2026

Duplication of 4-bp in SACS leads to autosomal recessive spastic ataxia of Charlevoix–Saguenay type in two Pakistani patients

  • Saba Bibi1 na1,
  • Asad Munir  ORCID: orcid.org/0000-0001-5461-35991 na1,
  • Fawad Ali2,
  • Helen Nabiryo Frederiksen3,
  • Sabawoon Shah4,
  • Abdur Rashid3,
  • Sergey Oreshkov3,
  • Shahab Uddin  ORCID: orcid.org/0009-0000-9503-30561,
  • Hamid Ur Rahman  ORCID: orcid.org/0000-0001-9469-86891,
  • Shumaila Noreen1,
  • Mukhtar Ullah  ORCID: orcid.org/0000-0003-0911-08313,
  • Muhammad Ansar3,5 na1 &
  • …
  • Atta Ur Rehman  ORCID: orcid.org/0000-0002-5591-18351 na1 

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Subjects

  • Medical genetics
  • Neurodegeneration

Abstract

In this study, we present two patients from a Pakistani family affected by autosomal recessive spastic ataxia of Charlevoix–Saguenay, a rare neurodegenerative disorder. Exome sequencing identified a homozygous 4-bp duplication (NM_014363.6:c.12129_12132dup, p.Leu4045ArgfsTer8) in SACS correlating with disease in the affected family members.

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Acknowledgements

The authors gratefully acknowledge all participants for their volunteer participation in this study and for providing consent to publish their medical data. This project was partly supported by the Swiss National Science Foundation (Project numbers: 320030_212959 and IZSTZ0_216615) and Prix Claire et Selma Kattenburg to M.A.

Author information

Author notes
  1. These authors contributed equally: Saba Bibi, Asad Munir, Muhammad Ansar, Atta Ur Rehman.

Authors and Affiliations

  1. Department of Zoology, Faculty of Biological and Health Sciences, Hazara University, Mansehra, Pakistan

    Saba Bibi, Asad Munir, Shahab Uddin, Hamid Ur Rahman, Shumaila Noreen & Atta Ur Rehman

  2. Department of Neurology, Saidu Group of Teaching Hospital, Saidu Sharif, Swat, Pakistan

    Fawad Ali

  3. Department of Ophthalmology, University of Lausanne, Jules Gonin Eye Hospital, Fondation Asile Des Aveugles, Lausanne, Switzerland

    Helen Nabiryo Frederiksen, Abdur Rashid, Sergey Oreshkov, Mukhtar Ullah & Muhammad Ansar

  4. Department of Medicine, Luqman International Hospital, Saidu Sharif, Swat, Pakistan

    Sabawoon Shah

  5. Advanced Molecular Genetics and Genomics Disease Research and Treatment Centre, Dow University of Health Sciences, Sindh, Pakistan

    Muhammad Ansar

Authors
  1. Saba Bibi
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  2. Asad Munir
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  3. Fawad Ali
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  4. Helen Nabiryo Frederiksen
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  5. Sabawoon Shah
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  6. Abdur Rashid
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  7. Sergey Oreshkov
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  8. Shahab Uddin
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  9. Hamid Ur Rahman
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  10. Shumaila Noreen
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  11. Mukhtar Ullah
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  12. Muhammad Ansar
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  13. Atta Ur Rehman
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Corresponding authors

Correspondence to Muhammad Ansar or Atta Ur Rehman.

Ethics declarations

Competing interests

The authors declare no competing interests.

Ethical approval

This study was approved (approval code: F.No. HU/ORIC/2024/2018, dated: December 12th, 2024) by the Ethical Review Committee of Hazara University Mansehra. Similarly, informed consents were obtained in written format from all participants for their inclusion in this study as well as for publication of patients’ medical data.

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Cite this article

Bibi, S., Munir, A., Ali, F. et al. Duplication of 4-bp in SACS leads to autosomal recessive spastic ataxia of Charlevoix–Saguenay type in two Pakistani patients. Hum Genome Var (2026). https://doi.org/10.1038/s41439-026-00349-z

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  • Received: 13 October 2025

  • Revised: 08 March 2026

  • Accepted: 06 April 2026

  • Published: 28 April 2026

  • DOI: https://doi.org/10.1038/s41439-026-00349-z

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