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Natale MI, Manzur GB, Lusso SB, Cella E, Giovo ME, Andrada R, Goitia J, Fernández MF, Della Giovanna PS, Guillamondegui MJ, Domínguez M, Gutiérrez O, Izquierdo A, Hernández Herrera H, Velázquez Perdomo LG, Mistchenko AS, Valinotto LE. Analysis of COL7A1 pathogenic variants in a large cohort of dystrophic epidermolysis bullosa patients from Argentina reveals a new genotype-phenotype correlation. Am J Med Genet A 2022; 188:3153-3161. [PMID: 35979658 DOI: 10.1002/ajmg.a.62957] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 06/22/2022] [Accepted: 08/01/2022] [Indexed: 01/31/2023]
Abstract
Dystrophic epidermolysis bullosa (DEB) is a clinically heterogeneous heritable skin disorder, characterized by blistering of the skin and mucous membranes following minor trauma. Dominant (DDEB) and recessive (RDEB) forms are caused by pathogenic variants in COL7A1 gene. Argentina's population has a heterogeneous genetic background, and little is known about the molecular basis of DEB in our country or in native South American populations. In this study, we present the prevalence and geographical distribution of pathogenic variants found in 181 patients from 136 unrelated families (31 DDEB and 105 RDEB). We detected 95 different variants, 59 of them were previously reported in the literature and 36 were novel, nine of which were detected in more than one family. The most prevalent pathogenic variants were identified in exon 73 in DDEB patients and in exon 3 in RDEB patients. We also report a new phenotype-genotype correlation found in 10 unrelated families presenting mild blistering and severe mucosal involvement. Molecular studies in populations with an unexplored genetic background like ours revealed a diversity of pathogenic variants, and we hope that these findings will contribute to the definition of targets for new gene therapies.
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Affiliation(s)
- Mónica Inés Natale
- Center for Research in Genodermatoses and Epidermolysis Bullosa (CEDIGEA), University of Buenos Aires, Buenos Aires, Argentina
| | - Graciela Beatriz Manzur
- Center for Research in Genodermatoses and Epidermolysis Bullosa (CEDIGEA), University of Buenos Aires, Buenos Aires, Argentina.,Rare Diseases of the Skin Unit, Dr. R. Gutierrez Children's Hospital, Buenos Aires, Argentina.,Dermatology Department, Hospital de Clinicas "Jose de San Martín", Buenos Aires, Argentina
| | - Silvina Beatriz Lusso
- Center for Research in Genodermatoses and Epidermolysis Bullosa (CEDIGEA), University of Buenos Aires, Buenos Aires, Argentina
| | - Eliana Cella
- Pediatric Dermatology, Prof. Dr. Juan P. Garrahan Children's Hospital, Buenos Aires, Argentina
| | - María Elsa Giovo
- Pediatric Dermatology, La Santisima Trinidad Children's Hospital, Córdoba, Argentina
| | - Romina Andrada
- Dermatology, Avelino Castelan Children's Hospital, Resistencia, Chaco, Argentina
| | - Juana Goitia
- Pediatric Dermatology, Sor Maria Ludovica Children's Hospital, La Plata, Buenos Aires, Argentina
| | | | | | | | - Mariángeles Domínguez
- Pediatric Dermatology, Hospital General de Agudos "Carlos G. Durand", Buenos Aires, Argentina
| | - Olga Gutiérrez
- Pediatric Dermatology, Niños de Acosta Ñu Children's Hospital, San Lorenzo, Paraguay
| | - Agustín Izquierdo
- Bioinformatics, Translational Research Unit, Dr. R. Gutiérrez Children's Hospital, Buenos Aires, Argentina
| | - Heliana Hernández Herrera
- Center for Research in Genodermatoses and Epidermolysis Bullosa (CEDIGEA), University of Buenos Aires, Buenos Aires, Argentina.,Dermatology Department, Hospital de Clinicas "Jose de San Martín", Buenos Aires, Argentina
| | - Luz Graciela Velázquez Perdomo
- Center for Research in Genodermatoses and Epidermolysis Bullosa (CEDIGEA), University of Buenos Aires, Buenos Aires, Argentina.,Dermatology Department, Hospital de Clinicas "Jose de San Martín", Buenos Aires, Argentina
| | - Alicia Susana Mistchenko
- Center for Research in Genodermatoses and Epidermolysis Bullosa (CEDIGEA), University of Buenos Aires, Buenos Aires, Argentina
| | - Laura Elena Valinotto
- Center for Research in Genodermatoses and Epidermolysis Bullosa (CEDIGEA), University of Buenos Aires, Buenos Aires, Argentina.,National Scientific and Technical Research Council (CONICET), Argentina
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Trieutien S, Vu Van T, Tran Ngoc Thao M, Trinh The S, Tran Van K, Nguyen Thanh T, Tran Van T, Nguyen Thi H. Preimplantation Genetic Diagnosis for DEB by Detecting a Novel Family-Specific COL7A1 Mutation in Vietnam. Appl Clin Genet 2021; 14:467-472. [PMID: 34916826 PMCID: PMC8668251 DOI: 10.2147/tacg.s344107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Accepted: 12/03/2021] [Indexed: 11/23/2022] Open
Abstract
Background Epidermolysis bullosa (EB) is a disorder characterized by the appearance of blisters, erosions and wounds in response to minimal trauma. The disease manifests with noticeable symptoms ranging from mild to severe, classified into four major types: epidermolysis bullosa simplex (EBS), junctional epidermolysis bullosa (JEB), dystrophic epidermolysis bullosa (DEB) and Kindler syndrome. Preimplantation genetic diagnosis for the disease remains the only available option for families at risk for the recurrence of the disorder without having to terminate an ongoing pregnancy. Materials and Methods A novel COL7A1 mutation was used to design primers for the polymerase chain reaction (PCR) to amplify the segment spanning the mutation in the family and their in-vitro fertilization (IVF) embryos. Then, the PCR products were sequenced with Sanger sequencing to detect the alteration in the allele, and some embryos would go through NGS-based preimplantation screening for chromosomal abnormalities. Results The established protocol for EB detected mutant allele in 6/9 embryos (66.6%), while the remaining 3 embryos (33.4%) appeared to not carry any mutation. Only one among 3 embryos was recommended to be transferred into the mother's uterus. Conclusion The established preimplantation genetic diagnosis procedure is helpful to families affected by epidermolysis bullosa caused by COL7A1 mutations but wish to have healthy children.
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Affiliation(s)
- Sang Trieutien
- Department of Biology and Genetics, Vietnam Military Medical University, Hanoi, 12108, Vietnam
| | - Tam Vu Van
- Director Office, Hai Phong Hospital of Obstetrics and Gynecology, Haiphong, 40000, Vietnam.,Obstetrics and Gynecology Department, Haiphong University of Medicine and Pharmacy, Haiphong, 40000, Vietnam
| | - My Tran Ngoc Thao
- Département de formation Biologie moléculaire et cellulaire, Sorbonne University, Paris, 75006, France
| | - Son Trinh The
- Military Institute of Clinical Embryology and Histology, Vietnam Military Medical University, Hanoi, 12108, Vietnam
| | - Khoa Tran Van
- Department of Biology and Genetics, Vietnam Military Medical University, Hanoi, 12108, Vietnam
| | - Tung Nguyen Thanh
- Military Institute of Clinical Embryology and Histology, Vietnam Military Medical University, Hanoi, 12108, Vietnam
| | - Tuan Tran Van
- Military Institute of Clinical Embryology and Histology, Vietnam Military Medical University, Hanoi, 12108, Vietnam
| | - Hanh Nguyen Thi
- Faculty of Biology, VNU University of Science, Vietnam National University, Hanoi, 12108, Vietnam
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Escámez MJ, García M, Cuadrado-Corrales N, Llames SG, Charlesworth A, De Luca N, Illera N, Sánchez-Jimeno C, Holguín A, Duarte B, Trujillo-Tiebas MJ, Vicario JL, Santiago JL, Hernández-Martín A, Torrelo A, Castiglia D, Ayuso C, Larcher F, Jorcano JL, Meana A, Meneguzzi G, Zambruno G, Del Rio M. The first COL7A1 mutation survey in a large Spanish dystrophic epidermolysis bullosa cohort: c.6527insC disclosed as an unusually recurrent mutation. Br J Dermatol 2010; 163:155-61. [PMID: 20184583 DOI: 10.1111/j.1365-2133.2010.09713.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Dystrophic epidermolysis bullosa (DEB) is a genodermatosis caused by mutations in COL7A1. The clinical manifestations are highly variable from nail dystrophy to life-threatening blistering, making early molecular diagnosis and prognosis of utmost importance for the affected families. Mutation identification is mandatory for prenatal testing. OBJECTIVES To conduct the first mutational analysis of COL7A1 in a Spanish cohort, to assess mutation consequences at protein/mRNA level and to establish genotype-phenotype correlations. METHODS Forty-nine Spanish patients with DEB were studied. Antigen mapping was performed on patient skin biopsies. COL7A1 mutation screening in genomic DNA was performed by polymerase chain reaction (PCR) and direct sequencing. Mutation consequences were determined by reverse transcriptase-PCR. RESULTS Eight patients belonged to three unrelated families with dominant DEB. Forty-one were affected with recessive DEB (RDEB). Specifically, 27 displayed the severe generalized subtype, eight the other generalized subtype and six a localized phenotype (two pretibial, three acral and one inversa). Thirty-five mutations were identified, 20 of which are novel. The pathogenic mutation c.6527insC accounted for 46.3% of Spanish RDEB alleles. A consistent genotype-phenotype correlation was established. CONCLUSIONS Although the COL7A1 database indicates that most DEB mutations are family specific, the pathogenic mutation c.6527insC was highly recurrent in our cohort. This level of recurrence for a single genetic defect has never previously been reported for COL7A1. Our findings are essential to the clinicians caring for patients with DEB in Spain and in the large population of Spanish descendants in Latin America. They also provide geneticists a molecular clue for a priority mutation screening strategy.
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Affiliation(s)
- M J Escámez
- Basic Research Department, Epithelial Biomedicine Division, Regenerative Medicine Unit, CIEMAT-CIBERER U714, Av. Complutense 22, 28040 Madrid, Spain
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Kern JS, Kohlhase J, Bruckner-Tuderman L, Has C. Expanding the COL7A1 Mutation Database: Novel and Recurrent Mutations and Unusual Genotype – Phenotype Constellations in 41 Patients with Dystrophic Epidermolysis Bullosa. J Invest Dermatol 2006; 126:1006-12. [PMID: 16484981 DOI: 10.1038/sj.jid.5700219] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Dystrophic epidermolysis bullosa (DEB), a heterogeneous hereditary skin disorder characterized by trauma-induced blistering and scarring, affects thousands of families worldwide. The clinical manifestations extend from minor nail dystrophy to severe life-threatening blistering, making early molecular diagnosis and prognostication of utmost importance for the affected families. DEB is caused by mutations in the COL7A1 gene encoding collagen VII in the skin. Molecular diagnostics and genotype-phenotype correlations in DEB remain complex owing to the gene structure, large variety of mutations, high rate of novel mutations, complex protein structure and assembly, and the heterogeneity of phenotypes. Here, we report an efficient strategy for COL7A1 mutation detection using direct automated DNA sequencing and implementation of software tools. With this approach, COL7A1 mutations of 41 DEB families were disclosed. Twenty-four mutations were novel and two recurrent. Elucidation of biological consequences of the mutations helped define disease mechanisms, but also revealed several unusual genotypic and/or phenotypic constellations, which impeded the diagnostics and prognostication. In addition, the studies disclosed a de novo mutation in recessive DEB and two new polymorphisms in the COL7A1 gene.
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Affiliation(s)
- Johannes S Kern
- Department of Dermatology, University of Freiburg, Hauptstrasse 7, Freiburg 79104, Germany
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