eISSN: 2720-5371
ISSN: 1230-2813
Advances in Psychiatry and Neurology/Postępy Psychiatrii i Neurologii
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SCImago Journal & Country Rank
2/2024
vol. 33
 
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Opis przypadku

Co-occurrence of CAPN3 homozygous mutation and CCTG expansion in the CNBP gene in a patient with muscular dystrophy

Wiktoria Radziwonik-Frączyk
1
,
Ewelina Elert-Dobkowska
1
,
Jolanta Kubalska
1
,
Iwona Stępniak
1
,
Marta Lipowska
2
,
Anna Potulska-Chromik
2
,
Anna Sułek
3

  1. Department of Genetics, Institute of Psychiatry and Neurology, Warsaw, Poland
  2. Department of Neurology, Medical University of Warsaw, Warsaw, Poland
  3. Faculty of Medicine, Lazarski University, Warsaw, Poland
Adv Psychiatry Neurol 2024; 33 (2): 109–114
Data publikacji online: 2024/07/24
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Purpose
Muscular dystrophy is a group of heterogeneous diseases causing progressive muscle weakness and atrophy. Many types have been defined, including Duchenne/Becker, myotonic, limb-girdle, congenital, and facioscapulohumeral muscular dystrophies. This study aims to present the first patient with both a homozygous CAPN3 mutation and a CCTG expansion in the CNBP gene, which suggests the co-occurrence of two diseases in a single patient.

Case description
Homozygous pathogenic variant c.550delA (p.Thr184ArgfsTer36) in the CAPN3 gene, as well as a heterozygous expansion of a CCTG repeat of the CNBP gene, were identified in a single patient. Segregation analysis showed both maternal and paternal heterozygous carriers for CAPN3 mutation, and a maternally inherited CNBP expansion.

Comment
In general, the co-occurrence of two diseases in a single patient is considered as uncommon, although possible, and therefore it should be taken into consideration in the populations with a relatively high prevalence of myotonic dystrophy type 2.

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