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Travessa AM, Dias P, Rosmaninho-Salgado J, Aza-Carmona M, Moldovan O, Díaz-González F, Godinho F, Romeu JC, Oliveira-Ramos F, do Céu Barreiros M, Sousa SB, Heath KE, Sousa AB. Characterization of three adults and an adolescent with Osteogenesis Imperfecta type VI and a novel founder SERPINF1 variant. Eur J Med Genet 2023; 66:104867. [PMID: 37839784 DOI: 10.1016/j.ejmg.2023.104867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Revised: 10/08/2023] [Accepted: 10/12/2023] [Indexed: 10/17/2023]
Abstract
Osteogenesis imperfecta (OI) type VI is an extremely rare form of OI caused by biallelic variants in the SERPINF1 gene, which codes for the pigment-epithelium derived factor (PEDF). We report on four patients (three adults and one adolescent) with a severe deforming form of OI. All patients presented no abnormalities at birth, frequent long bone and vertebrae fractures (mainly during childhood), marked short stature, severe bone deformities, chronic mild to moderate pain, and severe limitation of mobility, with three being completely wheelchair bound. Blue sclera and dentinogenesis imperfecta were absent, although some patients presented tooth, ophthalmological, and/or cardiac features. Radiographic findings included, among others, thin diaphysis and popcorn calcifications, both of which are non-specific to this type of OI. The novel homozygous variants c.816_819del (p.Met272Ilefs*8) and c.283+2T > G in SERPINF1 were identified in three and one patient, respectively. The three patients carrying the frameshift variant were born in nearby regions suggesting a founder effect. Describing the long-term outcomes of four patients with OI type VI, this cohort adds relevant data on the clinical features and prognosis of this type of OI.
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Affiliation(s)
- André M Travessa
- Medical Genetics Department and ERN-BOND, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal; Institute of Histology and Developmental Biology, Faculty of Medicine, University of Lisbon, Lisbon, Portugal.
| | - Patrícia Dias
- Medical Genetics Department and ERN-BOND, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - Joana Rosmaninho-Salgado
- Medical Genetics Unit and ERN-BOND, Hospital Pediátrico, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
| | - Miriam Aza-Carmona
- Institute of Medical & Molecular Genetics (INGEMM), IdiPAZ, Hospital Universitario La Paz, Universidad Autonóma de Madrid (UAM), and CIBERER, ISCIII, Madrid, Spain; Skeletal Dysplasia Multidisciplinary Unit (UMDE) and ERN-BOND, Hospital Universitario La Paz, UAM, Madrid, Spain
| | - Oana Moldovan
- Medical Genetics Department and ERN-BOND, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - Francisca Díaz-González
- Institute of Medical & Molecular Genetics (INGEMM), IdiPAZ, Hospital Universitario La Paz, Universidad Autonóma de Madrid (UAM), and CIBERER, ISCIII, Madrid, Spain; Skeletal Dysplasia Multidisciplinary Unit (UMDE) and ERN-BOND, Hospital Universitario La Paz, UAM, Madrid, Spain
| | - Fátima Godinho
- Department of Rheumatology, Hospital Garcia de Orta, Almada, Portugal; Associação Portuguesa de Osteogénese Imperfeita (APOI), Lisbon, Portugal
| | - José Carlos Romeu
- Department of Rheumatology, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - Filipa Oliveira-Ramos
- Rheumatology Research Unit, Molecular Medicine Institute, Faculty of Medicine, University of Lisbon, Lisbon, Portugal; Laboratory of Basic Immunology, Faculty of Medicine, University of Lisbon, Lisbon, Portugal
| | | | - Sérgio B Sousa
- Medical Genetics Unit and ERN-BOND, Hospital Pediátrico, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
| | - Karen E Heath
- Institute of Medical & Molecular Genetics (INGEMM), IdiPAZ, Hospital Universitario La Paz, Universidad Autonóma de Madrid (UAM), and CIBERER, ISCIII, Madrid, Spain; Skeletal Dysplasia Multidisciplinary Unit (UMDE) and ERN-BOND, Hospital Universitario La Paz, UAM, Madrid, Spain
| | - Ana Berta Sousa
- Medical Genetics Department and ERN-BOND, Hospital de Santa Maria, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal; Rheumatology Research Unit, Molecular Medicine Institute, Faculty of Medicine, University of Lisbon, Lisbon, Portugal
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Selina A, Kandagaddala M, Kumar V, Abraham SSC, Danda S, Madhuri V. SERPINF1 gene variants causing late-onset progressive deforming osteogenesis imperfecta - A study of 18 patients from India. Bone Rep 2023; 18:101690. [PMID: 37425194 PMCID: PMC10323215 DOI: 10.1016/j.bonr.2023.101690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 05/09/2023] [Accepted: 05/24/2023] [Indexed: 07/11/2023] Open
Abstract
SERPINF1 gene variants lead to a severe type of osteogenesis imperfecta (OI) attributed to defects in the matrix mineralization. We present 18 patients with SERPINF1 gene variants leading to severe progressive deforming OI, the largest series in the world to date. These patients were normal at birth and had the first fracture between 2 months to 9 years; progression of deformities was seen in 12 adolescents who became nonambulatory. Radiologically, compression fractures with kyphoscoliosis, protrusio acetabuli, and lytic lesions in the metaphysis and pelvis were seen in older children with classical popcorn appearance in the distal femoral metaphysis in three. By exome sequencing and targeted sequencing, we identified ten variants. One was unreported and novel; three other novel variants in this series were reported earlier. The recurrent deletion inframe mutation p.phe277del was found in 5 patients from three families. Alkaline phosphatase was elevated in all children on the first visit. Bone mineral density was low in all patients and showed improvement at two years in seven children on regular pamidronate therapy. For others, the 2 year BMD data were not available. The Z scores for four of the seven children showed worsening at the 2-year follow-up.
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Holtz AP, Souza LT, Ribeiro EM, Acosta AX, Lago RMRS, Simoni G, Llerena JC, Félix TM. Genetic analysis of osteogenesis imperfecta in a large Brazilian cohort. Bone 2023; 169:116683. [PMID: 36709916 DOI: 10.1016/j.bone.2023.116683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 12/27/2022] [Accepted: 01/23/2023] [Indexed: 01/28/2023]
Abstract
INTRODUCTION Osteogenesis imperfecta (OI) is a genetically and clinically heterogeneous disorder caused by disruption of type I collagen synthesis. Previous Brazilian molecular OI studies have been restricted to case reports or small cohorts. The Brazilian OI Network (BOIN) is a multicenter study collecting clinical OI treatment data from five reference centers in three regions of Brazil. OBJECTIVE To describe the molecular analysis of a large cohort of OI registered at BOIN. METHODS Targeted next-generation sequencing (NGS) was performed at a centralized laboratory with the Ion Torrent platform, covering 99.6 % of the coding regions of 18 OI-associated genes. Clinical information was obtained from a clinical database. RESULTS We included 156 subjects in the molecular analyses. Variants were detected in 121 subjects: 65 (53.7 %) in COL1A1, 42 (34.7 %) in COL1A2, 2 (1.7 %) in IFITM5, one (0.8 %) in CRTAP, three (2.5 %) in P3H1, two (1.7 %) in PPIB, four (3.3 %) FKBP10, one (0.8 %) in SERPINH1, and one (0.8 %) in TMEM38B. Ninety-one distinct variants were identified, of which 26 were novel. Of the 107 variants identified in COL1A1 and COL1A2, 24.5 % cause mild OI, while the remaining 75.5 % cause moderate, severe, or lethal OI, of which 49.3 % are glycine to serine substitutions. A single variant in FKBP10 (c.179A>C; p.Gln60Pro) was found in three unrelated and non-consanguineous participants living in the same geographic area in Northeast Brazil, suggesting a possible founder effect. CONCLUSION Consistent with the literature, 88.4 % of the subjects had a variant in the COL1A1 and COL1A2 genes, with 10 % inherited in an autosomal recessive manner. Notably, one variant in FKBP10 with a potential founder effect requires further investigation. Data from this large cohort improves our understanding of genotype-phenotype correlations for OI in Brazil.
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Affiliation(s)
- A P Holtz
- Post Graduate Program in Child and Adolescent Health, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Genomic Medicine Laboratory, Hospital de Clinicas de Porto Alegre, Porto Alegre, Brazil
| | - L T Souza
- Genomic Medicine Laboratory, Hospital de Clinicas de Porto Alegre, Porto Alegre, Brazil
| | - E M Ribeiro
- Genetics Service, Hospital Infantil Albert Sabin, Fortaleza, Brazil
| | - A X Acosta
- Pediatric Department, Hospital Universitário Prof. Edgar Santos, Salvador, Brazil
| | - R M R S Lago
- Pediatric Department, Hospital Universitário Prof. Edgar Santos, Salvador, Brazil
| | - G Simoni
- Pediatric Endocrinology Department, Hospital Infantil Joana de Gusmão, Florianópolis, Brazil
| | - J C Llerena
- Medical Genetics Department, Instituto Nacional Fernandes Figueira - Fiocruz, Rio de Janeiro, Brazil
| | - T M Félix
- Post Graduate Program in Child and Adolescent Health, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Genomic Medicine Laboratory, Hospital de Clinicas de Porto Alegre, Porto Alegre, Brazil; Medical Genetics Service, Hospital de Clinicas de Porto Alegre, Porto Alegre, Brazil.
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Amorim DMR, Koga GKC, Dos Santos RN, Secundo PFC, de Ávila Fernandes E, Cardili L, Maeda SS, da Rocha Corrêa Fernandes A, Lazaretti-Castro M. Rare Association Between Osteogenesis Imperfecta and Chondrosarcoma: Could a Pathogenic Variant in the Gene SERPINF1 Explain It? Calcif Tissue Int 2023; 112:118-122. [PMID: 36322168 DOI: 10.1007/s00223-022-01033-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 10/11/2022] [Indexed: 11/06/2022]
Abstract
Osteogenesis imperfecta (OI) type VI is a rare inherited disorder of the connective tissue caused by pathogenic variants in SERPINF1 gene, which encodes the pigment epithelium-derived factor (PEDF). PEDF is implicated in many biologic processes, including an anti-cancer role. This information is supported by in vitro and in vivo studies that evidenced its anti-angiogenic, anti-tumorigenic, and anti-metastatic properties. Although OI is related to skeletal changes such as bone fragility and deformities, as well as to other connective tissue defects, it does not represent a greater predisposition to the development of skeletal tumors. Here, we report on an adult with OI in which a deletion in exon 8 of the SERPINF1 gene (c.1152_1170del; p.384_390del) was identified. The patient presented popcorn calcification in both femoral epiphyses, but one of them presented radiological characteristics and evolution suspected of malignancy. Later, it was diagnosed as chondrosarcoma. This paper discusses that OI type VI patients may be at risk of developing some types of cancer.
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Affiliation(s)
| | | | | | | | | | - Leonardo Cardili
- Departament of Pathology, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Sergio Setsuo Maeda
- Department of Endocrinology, Universidade Federal de São Paulo, São Paulo, SP, Brazil
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Fernandes AM, Rocha-Braz MGM, França MM, Lerario AM, Simões VRF, Zanardo EA, Kulikowski LD, Martin RM, Mendonca BB, Ferraz-de-Souza B. The molecular landscape of osteogenesis imperfecta in a Brazilian tertiary service cohort. Osteoporos Int 2020; 31:1341-1352. [PMID: 32123938 DOI: 10.1007/s00198-020-05366-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 02/21/2020] [Indexed: 10/24/2022]
Abstract
UNLABELLED We have sought the molecular diagnosis of OI in 38 Brazilian cases through targeted sequencing of 15 candidate genes. While 71% had type 1 collagen-related OI, defects in FKBP10, PLOD2 and SERPINF1, and a potential digenic P3H1/WNT1 interaction were prominent causes of OI in this underrepresented population. INTRODUCTION Defects in type 1 collagen reportedly account for 85-90% of osteogenesis imperfecta (OI) cases, but most available molecular data has derived from Sanger sequencing-based approaches in developed countries. Massively parallel sequencing (MPS) allows for systematic and comprehensive analysis of OI genes simultaneously. Our objective was to obtain the molecular diagnosis of OI in a single Brazilian tertiary center cohort. METHODS Forty-nine individuals (84% adults) with a clinical diagnosis of OI, corresponding to 30 sporadic and 8 familial cases, were studied. Sixty-three percent had moderate to severe OI, and consanguinity was common (26%). Coding regions and 25-bp boundaries of 15 OI genes (COL1A1, COL1A2, IFITM5 [plus 5'UTR], SERPINF1, CRTAP, P3H1, PPIB, SERPINH1, FKBP10, PLOD2, BMP1, SP7, TMEM38B, WNT1, CREB3L1) were analyzed by targeted MPS and variants of interest were confirmed by Sanger sequencing or SNP array. RESULTS A molecular diagnosis was obtained in 97% of cases. COL1A1/COL1A2 variants were identified in 71%, whereas 26% had variants in other genes, predominantly FKBP10, PLOD2, and SERPINF1. A potential digenic interaction involving P3H1 and WNT1 was identified in one case. Phenotypic variability with collagen defects could not be explained by evident modifying variants. Four consanguineous cases were associated to heterozygous COL1A1/COL1A2 variants, and two nonconsanguineous cases had compound PLOD2 heterozygosity. CONCLUSIONS Novel disease-causing variants were identified in 29%, and a higher proportion of non-collagen defects was seen. Obtaining a precise diagnosis of OI in underrepresented populations allows expanding our understanding of its molecular landscape, potentially leading to improved personalized care in the future.
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Affiliation(s)
- A M Fernandes
- Laboratorio de Endocrinologia Celular e Molecular LIM-25 e Unidade de Doencas Osteometabolicas, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - M G M Rocha-Braz
- Laboratorio de Endocrinologia Celular e Molecular LIM-25 e Unidade de Doencas Osteometabolicas, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - M M França
- Laboratorio de Hormonios e Genetica Molecular LIM-42, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
- Department of Medicine, Section of Endocrinology, The University of Chicago, Chicago, IL, 60637, USA
| | - A M Lerario
- Laboratorio de Hormonios e Genetica Molecular LIM-42, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
- Department of Internal Medicine, Division of Metabolism, Endocrinology and Diabetes, University of Michigan, Ann Arbor, MI, USA
- Laboratorio de Sequenciamento em Larga Escala (SELA), Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - V R F Simões
- Laboratorio de Endocrinologia Celular e Molecular LIM-25 e Unidade de Doencas Osteometabolicas, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - E A Zanardo
- Laboratorio de Citogenomica, Departamento de Patologia, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - L D Kulikowski
- Laboratorio de Citogenomica, Departamento de Patologia, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - R M Martin
- Laboratorio de Hormonios e Genetica Molecular LIM-42, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
| | - B B Mendonca
- Laboratorio de Sequenciamento em Larga Escala (SELA), Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - B Ferraz-de-Souza
- Laboratorio de Endocrinologia Celular e Molecular LIM-25 e Unidade de Doencas Osteometabolicas, Divisao de Endocrinologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil.
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6
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Trancozo M, Moraes MVD, Silva DA, Soares JAM, Barbirato C, Almeida MG, Santos LR, Rebouças MRGO, Akel AN, Sipolatti V, Nunes VRR, Errera FIV, Aguena M, Passos-Bueno MR, Paula FD. Osteogenesis imperfecta in Brazilian patients. Genet Mol Biol 2019; 42:344-350. [PMID: 31429852 PMCID: PMC6726155 DOI: 10.1590/1678-4685-gmb-2018-0043] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 10/03/2018] [Indexed: 11/21/2022] Open
Abstract
Osteogenesis Imperfecta (OI) is a heterogeneous genetic disorder characterized by
bone fragility and fracture. Mutations in 20 distinct genes can cause OI, and
therefore, the genetic diagnosis of OI is frequently difficult to obtain because
of the great number of genes that can be related with this disease. Studies that
report the most frequently mutated genes in OI patients can help to improve
molecular strategies for diagnosis of the disease. In order to characterize the
mutation profile of OI in Brazilian patients, we analyzed 30 unrelated patients
through SSCP screening, NGS gene panel, and/or Sanger sequencing for the 11 most
frequently mutated genes in the database of mutations, including
COL1A1, COL1A2, P3H1,
CRTAP, PPIB, SERPINH1,
SERPINF1, FKBP10, SP7, WNT1 and
IFITM5. Disease-causing variants were identified in
COL1A1, COL1A2, FKBP10,
P3H1, and IFITM5. A total of 28 distinct mutations
were identified, including seven novel changes. Our data show that the analysis
of these five genes is able to detect at least 95% of causative mutations in OI
disorder from Brazilian population. However, it has to be taken into
considerations that distinct populations can have different frequencies of
disease-causing variants. Hence, it is important to replicate this study in
other groups.
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Affiliation(s)
- Maira Trancozo
- Núcleo de Genética Humana e Molecular, Departamento de Ciências Biológicas, Centro de Ciências Humanas e Naturais, Universidade Federal do Espírito Santo, Vitória, ES, Brazil.,Programa de Pós-Graduação em Biotecnologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
| | - Marcos V D Moraes
- Núcleo de Genética Humana e Molecular, Departamento de Ciências Biológicas, Centro de Ciências Humanas e Naturais, Universidade Federal do Espírito Santo, Vitória, ES, Brazil.,Programa de Pós-Graduação em Biotecnologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
| | - Dalila A Silva
- Núcleo de Genética Humana e Molecular, Departamento de Ciências Biológicas, Centro de Ciências Humanas e Naturais, Universidade Federal do Espírito Santo, Vitória, ES, Brazil.,Programa de Pós-Graduação em Biotecnologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
| | - Jéssica A M Soares
- Núcleo de Genética Humana e Molecular, Departamento de Ciências Biológicas, Centro de Ciências Humanas e Naturais, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
| | - Clara Barbirato
- Núcleo de Genética Humana e Molecular, Departamento de Ciências Biológicas, Centro de Ciências Humanas e Naturais, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
| | - Márcio G Almeida
- Núcleo de Genética Humana e Molecular, Departamento de Ciências Biológicas, Centro de Ciências Humanas e Naturais, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
| | - Lígia R Santos
- Núcleo de Genética Humana e Molecular, Departamento de Ciências Biológicas, Centro de Ciências Humanas e Naturais, Universidade Federal do Espírito Santo, Vitória, ES, Brazil.,Programa de Pós-Graduação em Biotecnologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
| | | | - Akel N Akel
- Hospital Estadual Infantil Nossa Senhora da Glória, Vitória, ES, Brazil
| | | | - Vanda R R Nunes
- Hospital Estadual Infantil Nossa Senhora da Glória, Vitória, ES, Brazil
| | - Flavia I V Errera
- Programa de Pós-Graduação em Biotecnologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brazil.,Escola Superior de Ciências da Santa Casa de Misericórdia de Vitória, Vitória, ES, Brazil
| | - Meire Aguena
- Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brazil
| | | | - Flavia de Paula
- Núcleo de Genética Humana e Molecular, Departamento de Ciências Biológicas, Centro de Ciências Humanas e Naturais, Universidade Federal do Espírito Santo, Vitória, ES, Brazil.,Programa de Pós-Graduação em Biotecnologia, Centro de Ciências da Saúde, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
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Lleras-Forero L, Winkler C, Schulte-Merker S. Zebrafish and medaka as models for biomedical research of bone diseases. Dev Biol 2019; 457:191-205. [PMID: 31325453 DOI: 10.1016/j.ydbio.2019.07.009] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 07/13/2019] [Indexed: 12/17/2022]
Abstract
The identification of disease-causing mutations has in recent years progressed immensely due to whole genome sequencing approaches using patient material. The task accordingly is shifting from gene identification to functional analysis of putative disease-causing genes, preferably in an in vivo setting which also allows testing of drug candidates or biotherapeutics in whole animal disease models. In this review, we highlight the advances made in the field of bone diseases using small laboratory fish, focusing on zebrafish and medaka. We particularly highlight those human conditions where teleost models are available.
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Affiliation(s)
- L Lleras-Forero
- Institute for Cardiovascular Organogenesis and Regeneration, Faculty of Medicine, WWU Münster, Mendelstrasse 7, 48149 Münster, Germany; CiM Cluster of Excellence (EXC-1003-CiM), Münster, Germany.
| | - C Winkler
- Department of Biological Sciences and Centre for Bioimaging Sciences, National University of Singapore, 14 Science Drive 04, 117558 Singapore
| | - S Schulte-Merker
- Institute for Cardiovascular Organogenesis and Regeneration, Faculty of Medicine, WWU Münster, Mendelstrasse 7, 48149 Münster, Germany; CiM Cluster of Excellence (EXC-1003-CiM), Münster, Germany.
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Liu Y, Hou F, Qian Z, Liu X. Functional characterization of the clade B serine protease inhibitor SerpinB3 in the pacific white shrimp Litopenaeus vannamei. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2018; 85:10-17. [PMID: 29550271 DOI: 10.1016/j.dci.2018.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 03/11/2018] [Accepted: 03/13/2018] [Indexed: 06/08/2023]
Abstract
The clade B serpins contain predominantly intracellular proteins and were reported to be involved in multiple biological functions, especially in inflammation and immune system function. However, studies about the role of the invertebrate intracellular serpins in immune responses were still deficient. Therefore, this paper focused on the functional characterization of LvserpinB3 in white shrimp Litopenaeus vannamei. The pAc5.1-LvserpinB3-EGFP vector was transfected into Drosophila Schneider 2 (S2) cells to analyze the subcellular localization of LvserpinB3, and fluorescent imaging showed that LvserpinB3 were mainly localized to the mitochondria. Knockdown LvserpinB3 significantly increased the mRNA expression of LvSpätzle4 (LvSpz4) and LvPenaeidin4 (LvPen4) upon Vibrio anguillarum infection. Moreover, GST-Pull down analysis showed that LvserpinB3 could interact with serine protease 1 (LvSP1). The recombinant LvserpinB3 (rLvserpinB3) protein exhibited inhibitory roles on the proteolytic activity of trypsin, whereas, mutation at the P1 residue led to the disfunction of the inhibitor. Furthermore, the LvserpinB3 and trypsin mixture were incubated with Anti-SERPINB3 antibodies, and a peptide band with an apparent molecular weight of 30 kDa were detected by western blot analysis. These findings might be valuable in understanding the potential role for LvserpinB3 in inhibiting the target proteases during shrimp immune defences.
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Affiliation(s)
- Yongjie Liu
- College of Animal Science and Technology, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China; Ministry of Education and Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200092, China.
| | - Fujun Hou
- College of Animal Science and Technology, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Zhaoying Qian
- School of Resource & Environmental Management, Guizhou University of Finance and Economics, Guizhou 550025, China
| | - Xiaolin Liu
- College of Animal Science and Technology, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China.
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9
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Jin Z, Burrage LC, Jiang MM, Lee YC, Bertin T, Chen Y, Tran A, Gibbs RA, Jhangiani S, Sutton VR, Rauch F, Lee B, Jain M. Whole-Exome Sequencing Identifies an Intronic Cryptic Splice Site in SERPINF1 Causing Osteogenesis Imperfecta Type VI. JBMR Plus 2018; 2:235-239. [PMID: 30283904 PMCID: PMC6124173 DOI: 10.1002/jbm4.10044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 02/06/2018] [Accepted: 02/13/2018] [Indexed: 12/31/2022] Open
Abstract
The heritable disorder osteogenesis imperfecta (OI) is characterized by bone fragility and low bone mass. OI type VI is an autosomal recessive form of the disorder with moderate to severe bone fragility. OI type VI is caused by mutations in the serpin peptidase inhibitor, clade F, member 1 (SERPINF1), the gene coding for pigment epithelium‐derived factor (PEDF). Here, we report a patient with OI type VI caused by a novel homozygous intronic variant in SERPINF1 identified by whole‐exome sequencing (WES). The mutation was not identified using a low bone mass gene panel based on next‐generation sequencing. This variant creates a novel consensus splice donor site (AGGC to AGGT) in intron 4. Analysis of cDNA generated from fibroblasts revealed retention of a 32‐bp intronic fragment between exons 4 and 5 in the cDNA, a result of alternative splicing from the novel splice‐donor site. As a result, the aberrant insertion of this intronic fragment generated a frameshift pathogenic variant and induced nonsense‐mediated decay. Furthermore, gene expression by quantitative PCR showed SERPINF1 expression was dramatically reduced in patient fibroblasts, and PEDF level was also significantly reduced in the patient's plasma. In conclusion, we report a novel homozygous variant that generates an alternative splice‐donor in intron 4 of SERPINF1 which gives rise to severe bone fragility. The work also demonstrates clinical utility of WES analysis, and consideration of noncoding variants, in the diagnostic setting of rare bone diseases. © 2018 The Authors. JBMR Plus is published by Wiley Periodicals, Inc. on behalf of American Society for Bone and Mineral Research.
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Affiliation(s)
- Zixue Jin
- Department of Molecular and Human Genetics Baylor College of Medicine Houston TX USA
| | - Lindsay C Burrage
- Department of Molecular and Human Genetics Baylor College of Medicine Houston TX USA.,Texas Children's Hospital Houston TX USA
| | - Ming-Ming Jiang
- Department of Molecular and Human Genetics Baylor College of Medicine Houston TX USA
| | - Yi-Chien Lee
- Department of Molecular and Human Genetics Baylor College of Medicine Houston TX USA
| | - Terry Bertin
- Department of Molecular and Human Genetics Baylor College of Medicine Houston TX USA
| | - Yuqing Chen
- Department of Molecular and Human Genetics Baylor College of Medicine Houston TX USA
| | - Alyssa Tran
- Department of Molecular and Human Genetics Baylor College of Medicine Houston TX USA
| | - Richard A Gibbs
- Human Genome Sequencing Center, Baylor College of Medicine Houston TX USA
| | - Shalini Jhangiani
- Human Genome Sequencing Center, Baylor College of Medicine Houston TX USA
| | - V Reid Sutton
- Department of Molecular and Human Genetics Baylor College of Medicine Houston TX USA
| | - Frank Rauch
- Shriners Hospital for Children and McGill University Montreal Canada
| | - Brendan Lee
- Department of Molecular and Human Genetics Baylor College of Medicine Houston TX USA
| | - Mahim Jain
- Department of Molecular and Human Genetics Baylor College of Medicine Houston TX USA.,Kennedy Krieger Institute Baltimore MD USA
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10
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Essawi O, Symoens S, Fannana M, Darwish M, Farraj M, Willaert A, Essawi T, Callewaert B, De Paepe A, Malfait F, Coucke PJ. Genetic analysis of osteogenesis imperfecta in the Palestinian population: molecular screening of 49 affected families. Mol Genet Genomic Med 2017; 6:15-26. [PMID: 29150909 PMCID: PMC5823677 DOI: 10.1002/mgg3.331] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Revised: 07/09/2017] [Accepted: 07/10/2017] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Osteogenesis imperfecta (OI) is a heterogeneous hereditary connective tissue disorder clinically hallmarked by increased susceptibility to bone fractures. METHODS We analyzed a cohort of 77 diagnosed OI patients from 49 unrelated Palestinian families. Next-generation sequencing technology was used to screen a panel of known OI genes. RESULTS In 41 probands, we identified 28 different disease-causing variants of 9 different known OI genes. Eleven of the variants are novel. Ten of the 28 variants are located in COL1A1, five in COL1A2, three in BMP1, three in FKBP10, two in TMEM38B, two in P3H1, and one each in CRTAP, SERPINF1, and SERPINH1. The absence of disease-causing variants in the remaining eight probands suggests further genetic heterogeneity in OI. In general, most OI patients (90%) harbor mainly variants in type I collagen resulting in an autosomal dominant inheritance pattern. However, in our cohort almost 61% (25/41) were affected with autosomal recessive OI. Moreover, we document a 21-kb genomic deletion in the TMEM38B gene identified in 29% (12/41) of the tested probands, making it the most frequent OI-causing variant in the Palestinian population. CONCLUSION This is the first genetic screening of an OI cohort from the Palestinian population. Our data are important for genetic counseling of OI patients and families in highly consanguineous populations.
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Affiliation(s)
- Osama Essawi
- Department Master Program in Clinical Laboratory Science, Birzeit University, Birzeit, Palestine.,Center for Medical Genetics, Ghent University, Ghent, Belgium
| | - Sofie Symoens
- Center for Medical Genetics, Ghent University, Ghent, Belgium
| | - Maha Fannana
- Dr. Al Rantisi Specialized Children Hospital, Gaza, Palestine
| | | | - Mohammad Farraj
- Department Master Program in Clinical Laboratory Science, Birzeit University, Birzeit, Palestine
| | - Andy Willaert
- Center for Medical Genetics, Ghent University, Ghent, Belgium
| | - Tamer Essawi
- Department Master Program in Clinical Laboratory Science, Birzeit University, Birzeit, Palestine
| | - Bert Callewaert
- Center for Medical Genetics, Ghent University, Ghent, Belgium
| | - Anne De Paepe
- Center for Medical Genetics, Ghent University, Ghent, Belgium
| | | | - Paul J Coucke
- Center for Medical Genetics, Ghent University, Ghent, Belgium
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11
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Kang H, Aryal A C S, Marini JC. Osteogenesis imperfecta: new genes reveal novel mechanisms in bone dysplasia. Transl Res 2017; 181:27-48. [PMID: 27914223 DOI: 10.1016/j.trsl.2016.11.005] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Revised: 11/04/2016] [Accepted: 11/07/2016] [Indexed: 12/20/2022]
Abstract
Osteogenesis imperfecta (OI) is a skeletal dysplasia characterized by fragile bones and short stature and known for its clinical and genetic heterogeneity which is now understood as a collagen-related disorder. During the last decade, research has made remarkable progress in identifying new OI-causing genes and beginning to understand the intertwined molecular and biochemical mechanisms of their gene products. Most cases of OI have dominant inheritance. Each new gene for recessive OI, and a recently identified gene for X-linked OI, has shed new light on its (often previously unsuspected) function in bone biology. Here, we summarize the literature that has contributed to our current understanding of the pathogenesis of OI.
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Affiliation(s)
- Heeseog Kang
- Section on Heritable Disorders of Bone and Extracellular Matrix, NICHD, NIH, Bethesda, Md
| | - Smriti Aryal A C
- Section on Heritable Disorders of Bone and Extracellular Matrix, NICHD, NIH, Bethesda, Md
| | - Joan C Marini
- Section on Heritable Disorders of Bone and Extracellular Matrix, NICHD, NIH, Bethesda, Md.
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12
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Wang JY, Liu Y, Song LJ, Lv F, Xu XJ, San A, Wang J, Yang HM, Yang ZY, Jiang Y, Wang O, Xia WB, Xing XP, Li M. Novel Mutations in SERPINF1 Result in Rare Osteogenesis Imperfecta Type VI. Calcif Tissue Int 2017; 100:55-66. [PMID: 27796462 DOI: 10.1007/s00223-016-0201-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 10/17/2016] [Indexed: 10/20/2022]
Abstract
Osteogenesis imperfecta (OI) is a group of inherited disorders characterized by recurrent fragile fractures. Serpin peptidase inhibitor, clade F, member 1 (SERPINF1) is known to cause a distinct, extremely rare autosomal recessive form of type VI OI. Here we report, for the first time, the detection of SERPINF1 mutations in Chinese OI patients. We designed a novel targeted next-generation sequencing panel of OI-related genes to identify pathogenic mutations, which were confirmed with Sanger sequencing and by co-segregation analysis. We also investigated the phenotypes of OI patients by evaluating bone mineral density, radiological fractures, serum bone turnover markers, and pigment epithelium-derived factor (PEDF) concentration. Six patients with moderate-to-severe bone fragility, significantly low bone mineral density, and severe deformities of the extremities were recruited from five unrelated families for this study. Six pathogenic mutations in SERPINF1 gene were identified, five of which were novel: (1) a homozygous in-frame insertion in exon 3 (c.271_279dup, p.Ala91_Ser93dup); (2) compound heterozygous mutations in intron 3 (c.283 + 1G > T, splicing site) and exon 5 (c.498_499delCA, p.Arg167SerfsX35, frameshift); (3) a homozygous frameshift mutation in exon 8 (c.1202_1203delCA, p.Thr401ArgfsX); (4) compound heterozygous missense mutation (c.184G > A, p.Gly62Ser) and in-frame insertion (c.271_279dup, p.Ala91_Ser93dup) in exon 3; and (5) a heterozygous nonsense mutation in exon 4 (c.397C>T + ?, p.Gln133X + ?). Serum PEDF levels were barely detectable in almost all subjects. We identified five novel mutations in SERPINF1 and confirmed the diagnostic value of serum PEDF level for the first time in Chinese patients with the extremely rare OI type VI.
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Affiliation(s)
- Jian-Yi Wang
- Department of Endocrinology, Key Laboratory of Endocrinology of Ministry of Health, Peking Union Medical College Hospital, Chinese Academy of Medical Science, Shuaifuyuan No. 1, Dongcheng District, Beijing, 100730, China
- Department of Cardiology, FuWai Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, 100037, China
| | - Yi Liu
- Department of Endocrinology, Key Laboratory of Endocrinology of Ministry of Health, Peking Union Medical College Hospital, Chinese Academy of Medical Science, Shuaifuyuan No. 1, Dongcheng District, Beijing, 100730, China
| | - Li-Jie Song
- Binhai Genomics Institute, BGI-Tianjin, BGI-shenzhen, Tianjin, 300308, China
- Tianjin Translational Genomics Center, BGI-Tianjin, BGI-shenzhen, Tianjin, 300308, China
| | - Fang Lv
- Department of Endocrinology, Key Laboratory of Endocrinology of Ministry of Health, Peking Union Medical College Hospital, Chinese Academy of Medical Science, Shuaifuyuan No. 1, Dongcheng District, Beijing, 100730, China
| | - Xiao-Jie Xu
- Department of Endocrinology, Key Laboratory of Endocrinology of Ministry of Health, Peking Union Medical College Hospital, Chinese Academy of Medical Science, Shuaifuyuan No. 1, Dongcheng District, Beijing, 100730, China
| | - A San
- Binhai Genomics Institute, BGI-Tianjin, BGI-shenzhen, Tianjin, 300308, China
- Tianjin Translational Genomics Center, BGI-Tianjin, BGI-shenzhen, Tianjin, 300308, China
| | - Jian Wang
- BGI-shenzhen, Shenzhen, 518083, China
- James D. Watson Institute of Genome Sciences, Hangzhou, 310058, China
| | - Huan-Ming Yang
- BGI-shenzhen, Shenzhen, 518083, China
- James D. Watson Institute of Genome Sciences, Hangzhou, 310058, China
| | - Zi-Ying Yang
- Binhai Genomics Institute, BGI-Tianjin, BGI-shenzhen, Tianjin, 300308, China
- Tianjin Translational Genomics Center, BGI-Tianjin, BGI-shenzhen, Tianjin, 300308, China
| | - Yan Jiang
- Department of Endocrinology, Key Laboratory of Endocrinology of Ministry of Health, Peking Union Medical College Hospital, Chinese Academy of Medical Science, Shuaifuyuan No. 1, Dongcheng District, Beijing, 100730, China
| | - Ou Wang
- Department of Endocrinology, Key Laboratory of Endocrinology of Ministry of Health, Peking Union Medical College Hospital, Chinese Academy of Medical Science, Shuaifuyuan No. 1, Dongcheng District, Beijing, 100730, China
| | - Wei-Bo Xia
- Department of Endocrinology, Key Laboratory of Endocrinology of Ministry of Health, Peking Union Medical College Hospital, Chinese Academy of Medical Science, Shuaifuyuan No. 1, Dongcheng District, Beijing, 100730, China
| | - Xiao-Ping Xing
- Department of Endocrinology, Key Laboratory of Endocrinology of Ministry of Health, Peking Union Medical College Hospital, Chinese Academy of Medical Science, Shuaifuyuan No. 1, Dongcheng District, Beijing, 100730, China
| | - Mei Li
- Department of Endocrinology, Key Laboratory of Endocrinology of Ministry of Health, Peking Union Medical College Hospital, Chinese Academy of Medical Science, Shuaifuyuan No. 1, Dongcheng District, Beijing, 100730, China.
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13
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Belinsky GS, Sreekumar B, Andrejecsk JW, Saltzman WM, Gong J, Herzog RI, Lin S, Horsley V, Carpenter TO, Chung C. Pigment epithelium-derived factor restoration increases bone mass and improves bone plasticity in a model of osteogenesis imperfecta type VI via Wnt3a blockade. FASEB J 2016; 30:2837-48. [PMID: 27127101 DOI: 10.1096/fj.201500027r] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 04/18/2016] [Indexed: 12/23/2022]
Abstract
Null mutations in for pigment epithelium-derived factor (PEDF), the protein product of the SERPINF1 gene, are the cause of osteogenesis imperfecta (OI) type VI. The PEDF-knockout (KO) mouse captures crucial elements of the human disease, including diminished bone mineralization and propensity to fracture. Our group and others have demonstrated that PEDF directs human mesenchymal stem cell (hMSC) commitment to the osteoblast lineage and modulates Wnt/β-catenin signaling, a major regulator of bone development; however, the ability of PEDF to restore bone mass in a mouse model of OI type VI has not been determined. In this study, PEDF delivery increased trabecular bone volume/total volume by 52% in 6-mo-old PEDF-KO mice but not in wild-type mice. In young (19-d-old) PEDF-KO mice, PEDF restoration increased bone volume fraction by 35% and enhanced biomechanical parameters of bone plasticity. A Wnt-green fluorescent protein reporter demonstrated dynamic changes in Wnt/β-catenin signaling characterized by early activation and marked suppression during terminal differentiation of hMSCs. Continuous Wnt3a exposure impeded mineralization of hMSCs, whereas the combination of Wnt3a and PEDF potentiated mineralization. Interrogation of the PEDF sequence identified a conserved motif found in other Wnt modulators, such as the dickkopf proteins. Mutation of a single amino acid on a 34-mer PEDF peptide increased mineralization of hMSC cultures compared with the native peptide sequence. These results indicate that PEDF counters Wnt signaling to allow for osteoblast differentiation and provides a mechanistic insight into how the PEDF null state results in OI type VI.-Belinsky, G. S., Sreekumar, B., Andrejecsk, J. W., Saltzman, W. M., Gong, J., Herzog, R. I., Lin, S., Horsley, V., Carpenter, T. O., Chung, C. Pigment epithelium-derived factor restoration increases bone mass and improves bone plasticity in a model of osteogenesis imperfecta type VI via Wnt3a blockade.
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Affiliation(s)
- Glenn S Belinsky
- Department of Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Bharath Sreekumar
- Department of Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Jillian W Andrejecsk
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut, USA
| | - W Mark Saltzman
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut, USA
| | - Jingjing Gong
- Department of Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Raimund I Herzog
- Department of Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Samantha Lin
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut, USA
| | - Valerie Horsley
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut, USA
| | - Thomas O Carpenter
- Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Chuhan Chung
- Department of Medicine, Yale University School of Medicine, New Haven, Connecticut, USA; Veterans Affairs Connecticut Healthcare System, West Haven, Connecticut, USA
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14
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Ziff JL, Crompton M, Powell HRF, Lavy JA, Aldren CP, Steel KP, Saeed SR, Dawson SJ. Mutations and altered expression of SERPINF1 in patients with familial otosclerosis. Hum Mol Genet 2016; 25:2393-2403. [PMID: 27056980 PMCID: PMC5181625 DOI: 10.1093/hmg/ddw106] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Revised: 03/24/2016] [Accepted: 03/25/2016] [Indexed: 01/08/2023] Open
Abstract
Otosclerosis is a relatively common heterogenous condition, characterized by abnormal bone remodelling in the otic capsule leading to fixation of the stapedial footplate and an associated conductive hearing loss. Although familial linkage and candidate gene association studies have been performed in recent years, little progress has been made in identifying disease-causing genes. Here, we used whole-exome sequencing in four families exhibiting dominantly inherited otosclerosis to identify 23 candidate variants (reduced to 9 after segregation analysis) for further investigation in a secondary cohort of 84 familial cases. Multiple mutations were found in the SERPINF1 (Serpin Peptidase Inhibitor, Clade F) gene which encodes PEDF (pigment epithelium-derived factor), a potent inhibitor of angiogenesis and known regulator of bone density. Six rare heterozygous SERPINF1 variants were found in seven patients in our familial otosclerosis cohort; three are missense mutations predicted to be deleterious to protein function. The other three variants are all located in the 5′-untranslated region (UTR) of an alternative spliced transcript SERPINF1-012. RNA-seq analysis demonstrated that this is the major SERPINF1 transcript in human stapes bone. Analysis of stapes from two patients with the 5′-UTR mutations showed that they had reduced expression of SERPINF1-012. All three 5′-UTR mutations are predicted to occur within transcription factor binding sites and reporter gene assays confirmed that they affect gene expression levels. Furthermore, RT-qPCR analysis of stapes bone cDNA showed that SERPINF1-012 expression is reduced in otosclerosis patients with and without SERPINF1 mutations, suggesting that it may be a common pathogenic pathway in the disease.
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Affiliation(s)
- Joanna L Ziff
- UCL Ear Institute, University College London, London WC1X 8EE, UK
| | - Michael Crompton
- UCL Ear Institute, University College London, London WC1X 8EE, UK
| | - Harry R F Powell
- Royal National Throat Nose and Ear Hospital, London WC1X 8EE, UK
| | - Jeremy A Lavy
- Royal National Throat Nose and Ear Hospital, London WC1X 8EE, UK
| | | | | | - Shakeel R Saeed
- UCL Ear Institute, University College London, London WC1X 8EE, UK.,Royal National Throat Nose and Ear Hospital, London WC1X 8EE, UK
| | - Sally J Dawson
- UCL Ear Institute, University College London, London WC1X 8EE, UK,
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15
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Sobreira N, Schiettecatte F, Boehm C, Valle D, Hamosh A. New tools for Mendelian disease gene identification: PhenoDB variant analysis module; and GeneMatcher, a web-based tool for linking investigators with an interest in the same gene. Hum Mutat 2015; 36:425-31. [PMID: 25684268 DOI: 10.1002/humu.22769] [Citation(s) in RCA: 127] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 02/09/2015] [Indexed: 01/10/2023]
Abstract
Identifying the causative variant from among the thousands identified by whole-exome sequencing or whole-genome sequencing is a formidable challenge. To make this process as efficient and flexible as possible, we have developed a Variant Analysis Module coupled to our previously described Web-based phenotype intake tool, PhenoDB (http://researchphenodb.net and http://phenodb.org). When a small number of candidate-causative variants have been identified in a study of a particular patient or family, a second, more difficult challenge becomes proof of causality for any given variant. One approach to this problem is to find other cases with a similar phenotype and mutations in the same candidate gene. Alternatively, it may be possible to develop biological evidence for causality, an approach that is assisted by making connections to basic scientists studying the gene of interest, often in the setting of a model organism. Both of these strategies benefit from an open access, online site where individual clinicians and investigators could post genes of interest. To this end, we developed GeneMatcher (http://genematcher.org), a freely accessible Website that enables connections between clinicians and researchers across the world who share an interest in the same gene(s).
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Affiliation(s)
- Nara Sobreira
- McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, 21205
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16
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Al-Jallad H, Palomo T, Roughley P, Glorieux FH, McKee MD, Moffatt P, Rauch F. The effect of SERPINF1 in-frame mutations in osteogenesis imperfecta type VI. Bone 2015; 76:115-20. [PMID: 25868797 DOI: 10.1016/j.bone.2015.04.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Revised: 03/01/2015] [Accepted: 04/03/2015] [Indexed: 01/05/2023]
Abstract
Osteogenesis imperfecta type VI is caused by mutations in SERPINF1, which codes for pigment-epithelium derived factor (PEDF). Most of the reported SERPINF1 mutations lead to premature termination codons, but three in-frame insertion or deletion mutations have also been reported. It is not clear how such in-frame mutations lead to OI type VI. In the present study we therefore investigated how SERPINF1 in-frame mutations affect the intracellular localization and secretion of PEDF. Skin fibroblasts affected by SERPINF1 in-frame mutations transcribed SERPINF1 at slightly reduced levels but secretion of PEDF was markedly diminished. Two deletions (p.F277del and the deletion of SERPINF1 exon 5) were associated with retention of PEDF in the endoplasmic reticulum and a stress response in osteoblastic cells. A recurrent in-frame duplication of three amino acids (p.Ala91_Ser93dup) appeared to lead to intracellular degradation but no retention in the endoplasmic reticulum or stress response. Immunofluorescence imaging in transiently transfected osteoblastic MC3T3-E1 cells suggested that PEDF affected by in-frame mutations was not transported along the secretory pathway. MC3T3-E1 osteoblasts stably overexpressing SERPINF1 with the p.Ala91_Ser93dup mutation had decreased collagen type I deposition and mineralization. Thus, the assessed homozygous in-frame deletions or insertions lead to retention or degradation within cellular compartments and thereby interfere with PEDF secretion.
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Affiliation(s)
- Hadil Al-Jallad
- Shriners Hospital for Children and McGill University, Montreal, Quebec, Canada
| | - Telma Palomo
- Shriners Hospital for Children and McGill University, Montreal, Quebec, Canada
| | - Peter Roughley
- Shriners Hospital for Children and McGill University, Montreal, Quebec, Canada
| | - Francis H Glorieux
- Shriners Hospital for Children and McGill University, Montreal, Quebec, Canada
| | - Marc D McKee
- Faculty of Dentistry, McGill University, Montreal, Quebec, Canada; Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada
| | - Pierre Moffatt
- Shriners Hospital for Children and McGill University, Montreal, Quebec, Canada
| | - Frank Rauch
- Shriners Hospital for Children and McGill University, Montreal, Quebec, Canada.
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