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Şahin A, Badakal EZD, Kovancılar Koç M, Uysal H, Başak AN. Case report: Revealing the rare-a Brody Disease patient from Turkey expanding the phenotype. Front Genet 2023; 14:1289312. [PMID: 38125752 PMCID: PMC10731957 DOI: 10.3389/fgene.2023.1289312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 11/16/2023] [Indexed: 12/23/2023] Open
Abstract
Brody Disease is an exceptionally rare, autosomal recessive myopathy attributed to the pathogenic variants in the ATP2A1, which encodes the sarcoplasmic/endoplasmic reticulum Ca (2+) ATPase type 1 protein SERCA1. It was first described by Brody IA in 1969. To date, only thirty-three Brody families with forty-seven patients have been reported in the literature, and the disease prevalence is considered as 1 in 10 million, demonstrating the peculiarity of the disease. Clinical characteristics of Brody Disease include muscle stiffness after exercise, myalgia, and muscle cramps. Brody Disease patients generally have disease onset in the first decade, and genetic diagnosis is delayed as a consequence of both the rareness and the mild course of the disease. Here, we report a Turkish Brody Disease patient with a homozygous c.428G>A p.Arg143Gln (NM_004320.4) missense mutation in the ATP2A1. The male patient, whose symptoms started at the age of 14-15, is now 36 years old. His clinical manifestations are athletic appearance, exotropia, slightly elevated creatine kinase (CK), mild progressive proximal muscle weakness in the lower extremities, muscle cramps, pain and stiffness. The patient described here has a very mild progression with an onset in the second decade, expanding the Brody Disease phenotype. The study also implies that in the era of emerging genetic therapies, the routine testing of patients with myopathies is a prerequisite since not only future therapies will be designed on molecular findings, but also currently available symptomatic and palliative treatment options will be more precisely applied.
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Affiliation(s)
- Ayça Şahin
- Suna and İnan Kıraç Foundation, Neurodegeneration Research Laboratory, Koç University Research Center for Translational Medicine (KUTTAM), School of Medicine, Koç University, İstanbul, Türkiye
| | - Esmer Zeynep Duru Badakal
- Suna and İnan Kıraç Foundation, Neurodegeneration Research Laboratory, Koç University Research Center for Translational Medicine (KUTTAM), School of Medicine, Koç University, İstanbul, Türkiye
| | - Müge Kovancılar Koç
- Suna and İnan Kıraç Foundation, Neurodegeneration Research Laboratory, Koç University Research Center for Translational Medicine (KUTTAM), School of Medicine, Koç University, İstanbul, Türkiye
| | - Hilmi Uysal
- Department of Neurology, Faculty of Medicine, Akdeniz University, Antalya, Türkiye
| | - Ayşe Nazlı Başak
- Suna and İnan Kıraç Foundation, Neurodegeneration Research Laboratory, Koç University Research Center for Translational Medicine (KUTTAM), School of Medicine, Koç University, İstanbul, Türkiye
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Kiener S, Troyer H, Ruvolo D, Grest P, Soto S, Letko A, Jagannathan V, Leeb T, Mauldin EA, Yang C, Rostaher A. Independent COL17A1 Variants in Cats with Junctional Epidermolysis Bullosa. Genes (Basel) 2023; 14:1835. [PMID: 37895184 PMCID: PMC10606533 DOI: 10.3390/genes14101835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 09/15/2023] [Accepted: 09/20/2023] [Indexed: 10/29/2023] Open
Abstract
Epidermolysis bullosa (EB), characterized by defective adhesion of the epidermis to the dermis, is a heterogeneous disease with many subtypes in human patients and domestic animals. We investigated two unrelated cats with recurring erosions and ulcers on ear pinnae, oral mucosa, and paw pads that were suggestive of EB. Histopathology confirmed the diagnosis of EB in both cats. Case 1 was severe and had to be euthanized at 5 months of age. Case 2 had a milder course and was alive at 11 years of age at the time of writing. Whole genome sequencing of both affected cats revealed independent homozygous variants in COL17A1 encoding the collagen type XVII alpha 1 chain. Loss of function variants in COL17A1 lead to junctional epidermolysis bullosa (JEB) in human patients. The identified splice site variant in case 1, c.3019+1del, was predicted to lead to a complete deficiency in collagen type XVII. Case 2 had a splice region variant, c.769+5G>A. Assessment of the functional impact of this variant on the transcript level demonstrated partial aberrant splicing with residual expression of wildtype transcript. Thus, the molecular analyses provided a plausible explanation of the difference in clinical severity between the two cases and allowed the refinement of the diagnosis in the affected cats to JEB. This study highlights the complexity of EB in animals and contributes to a better understanding of the genotype-phenotype correlation in COL17A1-related JEB.
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Affiliation(s)
- Sarah Kiener
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland; (S.K.); (A.L.); (V.J.)
- Dermfocus, University of Bern, 3001 Bern, Switzerland;
| | - Heather Troyer
- Oradell Animal Hospital, Paramus, NJ 07652, USA; (H.T.); (D.R.)
| | - Daniel Ruvolo
- Oradell Animal Hospital, Paramus, NJ 07652, USA; (H.T.); (D.R.)
| | - Paula Grest
- Institute of Veterinary Pathology, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland;
| | - Sara Soto
- Dermfocus, University of Bern, 3001 Bern, Switzerland;
- Institute of Animal Pathology, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland
| | - Anna Letko
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland; (S.K.); (A.L.); (V.J.)
| | - Vidhya Jagannathan
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland; (S.K.); (A.L.); (V.J.)
| | - Tosso Leeb
- Institute of Genetics, Vetsuisse Faculty, University of Bern, 3001 Bern, Switzerland; (S.K.); (A.L.); (V.J.)
- Dermfocus, University of Bern, 3001 Bern, Switzerland;
| | - Elizabeth A. Mauldin
- School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (E.A.M.); (C.Y.)
| | - Ching Yang
- School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (E.A.M.); (C.Y.)
- College of Veterinary Medicine, Long Island University, Brookville, NY 11548, USA
| | - Ana Rostaher
- Clinic for Small Animal Internal Medicine, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland;
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