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Inherited myopathies in the Middle East and North Africa. GENE REPORTS 2022. [DOI: 10.1016/j.genrep.2022.101674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Rekik S, Sakka S, Ben Romdhan S, Farhat N, Baba Amer Y, Lehkim L, Authier FJ, Mhiri C. Novel Missense CAPN3 Mutation Responsible for Adult-Onset Limb Girdle Muscular Dystrophy with Calves Hypertrophy. J Mol Neurosci 2019; 69:563-569. [PMID: 31410652 DOI: 10.1007/s12031-019-01383-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 07/09/2019] [Indexed: 02/01/2023]
Abstract
CAPN3 gene encodes for calpain-3; this protein is a calcium-dependent intracellular protease. Deficiency of this enzyme leads to weakness of the proximal limb muscles and pelvic and shoulder girdles, the so-called limb-girdle muscular dystrophy type 2A (LGMD2A). Here, we reported the case of a Tunisian patient with LGMD2A associated with a novel missense mutation (c.T1681C/p.Y561H). A 61-year-old man, with consanguineous parents, was referred for gait difficulties and slowly progressive proximal weakness of the four limbs associated with moderate hypertrophy of the calves but his facial muscles were unaffected. Electromyography showed that the profile was myopathic pattern and creatine kinase (CK) level was high. Muscle biopsy processing included routine histological, immunohistochemical, and Western Blot reactions, using a panel of antibodies directed against dystrophin, dysferlin, calpain-3, sarcoglycan α, β, γ, and δ. For mutation analysis, we designed an NGS-based screening. Immunological analyses demonstrated a total deficiency in calpain-3 and δ-sarcoglycan, and a reduced expression of dysferlin. The genetic study yielded a homozygous missense mutation (c.T1681C) of the 13th exon of the CAPN3 gene. The mutation found in our patient (c.T1681C/p.Y561H) has not been previously reported. It is responsible for complete calpain-3 and δ-sarcoglycan deficiency and reduced dysferlin expression. The genetic study is mandatory in such cases with multiple-protein deficiency and ambiguous results of immune-histology and Western Blot studies.
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Affiliation(s)
- Sabrine Rekik
- Laboratory of Neurogenetics, Parkinson's Disease and Cerebrovascular Disease (LR-12-SP-19), University Hospital Habib Bourguiba, Sfax, Tunisia. .,Clinical Investigation Center (CIC), CHU Habib Bourguiba, Sfax, Tunisia.
| | - Salma Sakka
- Laboratory of Neurogenetics, Parkinson's Disease and Cerebrovascular Disease (LR-12-SP-19), University Hospital Habib Bourguiba, Sfax, Tunisia
| | - Sawssan Ben Romdhan
- Laboratory of Neurogenetics, Parkinson's Disease and Cerebrovascular Disease (LR-12-SP-19), University Hospital Habib Bourguiba, Sfax, Tunisia.,Clinical Investigation Center (CIC), CHU Habib Bourguiba, Sfax, Tunisia
| | - Nouha Farhat
- Laboratory of Neurogenetics, Parkinson's Disease and Cerebrovascular Disease (LR-12-SP-19), University Hospital Habib Bourguiba, Sfax, Tunisia
| | - Yasmine Baba Amer
- U955-IMRB, Team 10, Biology of the Neuromuscular System, Inserm, UPEC, Créteil, France
| | - Leila Lehkim
- Anatomopathology Laboratory, CHU Habib Bourguiba, Sfax, Tunisia
| | | | - Chokri Mhiri
- Laboratory of Neurogenetics, Parkinson's Disease and Cerebrovascular Disease (LR-12-SP-19), University Hospital Habib Bourguiba, Sfax, Tunisia.,Clinical Investigation Center (CIC), CHU Habib Bourguiba, Sfax, Tunisia
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Salem IH, Hsairi I, Mezghani N, Kenoun H, Triki C, Fakhfakh F. CAPN3 mRNA processing alteration caused by splicing mutation associated with novel genomic rearrangement of Alu elements. J Hum Genet 2011; 57:92-100. [PMID: 22158424 DOI: 10.1038/jhg.2011.129] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Recessive mutations of CAPN3 gene are reported to be responsible for limb girdle muscular dystrophy type 2A (LGMD2A). In all, 15-25% of intronic nucleotide changes identified in this gene were investigated by in silico analysis, but occasionally supported by experimental data or reported in some cases as a polymorphism. We report here genetic and transcriptional analyses in three Tunisian patients belonging to the same consanguineous family sharing the same mutation c.1194-9 A>G and Alu repeats insertion in intron 7 of CAPN3 gene. Reverse transcriptase-PCR experiments performed on total RNA from the patient's muscle biopsy showed retention of the eight last nucleotides of intron 9 in the CAPN3 transcript lacking the first seven exons. Our results provide evidence regarding the potential involvement of Alu elements in aberrant processing of pre-mRNA owing to the disruption of pre-existing intronic splicing regulatory elements. We also demonstrated variable mRNA alternative splicing among tissues and between LGMD2A patients. A deep intronic variation and rearrangement have been reported in the literature as causing genetic diseases in humans. However, this is the first report on a potential pathogenic CAPN3 gene mutation resulting from an Alu insertion.
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Affiliation(s)
- Ikhlass Hadj Salem
- Laboratoire de Génétique Moléculaire Humaine, Université de Sfax, Sfax, Tunisia.
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