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Li D, Qiao J, Huang D, Guo R, Ji J, Liu W. Novel and recurrent FBN1 mutations causing Marfan syndrome in two Chinese families. Front Med (Lausanne) 2022; 9:1086844. [PMID: 36582279 PMCID: PMC9792469 DOI: 10.3389/fmed.2022.1086844] [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: 11/01/2022] [Accepted: 11/28/2022] [Indexed: 12/15/2022] Open
Abstract
Background To explore the genetic defects of two families with autosomal dominant Marfan syndrome (MFS). Methods Two families with MFS were enrolled in this study. The detailed ocular presentations of the patients were recorded. Whole exome sequencing was performed to explore the pathogenic variants and Sanger sequencing was performed to confirm the gene mutations. Segregation analysis among the family members was made and bioinformatics analysis was performed to predict the functional impact of the mutations. Results The main ocular presentations of the probands were increased axial length and ectopia lentis. Using whole exome sequencing and Sanger sequencing, a novel heterozygous missense mutation (c.5060G > C, p.Cys1687Ser) and a recurrent missense mutation (c.2168A > T, p.Asp723Val) were identified within FBN1, which were co-segregated with the MFS phenotype in the families. Evolutionary conservation analysis showed that codons 723 and 1,687 were highly conserved among several species. Functional impact predictions made using several online programs suggested that the mutations were pathogenic. Conclusion We identified a novel and a recurrent missense mutation in FBN1 in two Chinese families with MFS using whole exome sequencing, and our bioinformatics analysis indicated that the mutations were disease-causing. Our results expand the mutation spectrum of FBN1 and could help us better understand the genetic defects of the patients with MFS.
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Affiliation(s)
- Dandan Li
- Department of Ophthalmology, Tianjin TEDA Hospital, Tianjin, China
| | - Jun Qiao
- Department of Ophthalmology, Lanzhou Huaxia Eye Hospital, Lanzhou, Gansu, China
| | - Dandan Huang
- Department of Ophthalmology, Taihe Hospital, Hubei University of Medicine, Shiyan, Hubei, China
| | - Ruru Guo
- Tianjin Key Laboratory of Retinal Functions and Diseases, Tianjin Branch of National Clinical Research Center for Ocular Disease, Eye Institute and School of Optometry, Tianjin Medical University Eye Hospital, Tianjin, China
| | - Jian Ji
- Tianjin Key Laboratory of Retinal Functions and Diseases, Tianjin Branch of National Clinical Research Center for Ocular Disease, Eye Institute and School of Optometry, Tianjin Medical University Eye Hospital, Tianjin, China
| | - Wei Liu
- Tianjin Key Laboratory of Retinal Functions and Diseases, Tianjin Branch of National Clinical Research Center for Ocular Disease, Eye Institute and School of Optometry, Tianjin Medical University Eye Hospital, Tianjin, China,*Correspondence: Wei Liu,
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Wang Y, Gao P, Li F, Du J. Insights on aortic aneurysm and dissection: Role of the extracellular environment in vascular homeostasis. J Mol Cell Cardiol 2022; 171:90-101. [DOI: 10.1016/j.yjmcc.2022.06.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 05/06/2022] [Accepted: 06/29/2022] [Indexed: 11/29/2022]
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Yin X, Hao J, Yao Y. CRISPR/Cas9 in zebrafish: An attractive model for FBN1 genetic defects in humans. Mol Genet Genomic Med 2021; 9:e1775. [PMID: 34324266 PMCID: PMC8580104 DOI: 10.1002/mgg3.1775] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 06/25/2021] [Accepted: 07/19/2021] [Indexed: 12/27/2022] Open
Abstract
Background Mutations in the fibrillin‐1 gene (FBN1) are associated with various heritable connective tissue disorders (HCTD). The most studied HCTD is Marfan syndrome. Ninety percent of Marfan syndrome is caused by mutations in the FBN1 gene. The zebrafish share high genetic similarity to humans, representing an ideal model for genetic research of human diseases. This study aimed to generate and characterize fbn1+/− mutant zebrafish using the CRISPR/Cas9 gene‐editing technology. Methods CRISPR/Cas9 was applied to generate an fbn1 frameshift mutation (fbn1+/−) in zebrafish. F1 fbn1+/− heterozygotes were crossed with transgenic fluorescent zebrafish to obtain F2 fbn1+/− zebrafish. Morphological abnormalities were assessed in F2 fbn1+/− zebrafish by comparing with the Tuebingen (TU) wild‐type controls at different development stages. Results We successfully generated a transgenic line of fbn1+/− zebrafish. Compared with TU wild‐type zebrafish, F2 fbn1+/− zebrafish exhibited noticeably decreased pigmentation, increased lengths, slender body shape, and abnormal cardiac blood flow from atrium to ventricle. Conclusion We generated the first fbn1+/− zebrafish model using CRISPR/Cas9 gene‐editing approach to mimic FBN1 genetic defects in humans, providing an attractive model of Marfan syndrome and a method to determine the pathogenicity of gene mutation sites.
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Affiliation(s)
- Xiaoyun Yin
- Medical School of Chinese PLA, Beijing, China
| | - Jianxiu Hao
- Clinical Biobank Center, the Medical Innovation Research Division, Chinese PLA General Hospital, Beijing, China
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Du Q, Zhang D, Zhuang Y, Xia Q, Wen T, Jia H. The Molecular Genetics of Marfan Syndrome. Int J Med Sci 2021; 18:2752-2766. [PMID: 34220303 PMCID: PMC8241768 DOI: 10.7150/ijms.60685] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Accepted: 05/18/2021] [Indexed: 12/27/2022] Open
Abstract
Marfan syndrome (MFS) is a complex connective tissue disease that is primarily characterized by cardiovascular, ocular and skeletal systems disorders. Despite its rarity, MFS severely impacts the quality of life of the patients. It has been shown that molecular genetic factors serve critical roles in the pathogenesis of MFS. FBN1 is associated with MFS and the other genes such as FBN2, transforming growth factor beta (TGF-β) receptors (TGFBR1 and TGFBR2), latent TGF-β-binding protein 2 (LTBP2) and SKI, amongst others also have their associated syndromes, however high overlap may exist between these syndromes and MFS. Abnormalities in the TGF-β signaling pathway also contribute to the development of aneurysms in patients with MFS, although the detailed molecular mechanism remains unclear. Mutant FBN1 protein may cause unstableness in elastic structures, thereby perturbing the TGF-β signaling pathway, which regulates several processes in cells. Additionally, DNA methylation of FBN1 and histone acetylation in an MFS mouse model demonstrated that epigenetic factors play a regulatory role in MFS. The purpose of the present review is to provide an up-to-date understanding of MFS-related genes and relevant assessment technologies, with the aim of laying a foundation for the early diagnosis, consultation and treatment of MFS.
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Affiliation(s)
- Qiu Du
- Marfan Research Group, College of Medical Technology, Chengdu University of Traditional Chinese Medicine, Chengdu, 610072, Sichuan, China
| | - Dingding Zhang
- Marfan Research Group, College of Medical Technology, Chengdu University of Traditional Chinese Medicine, Chengdu, 610072, Sichuan, China.,Sichuan Provincial Key Laboratory for Genetic Disease, Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, 611731, Sichuan, China
| | - Yue Zhuang
- Department of Rheumatology and Immunology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 611731, Sichuan, China
| | - Qiongrong Xia
- Marfan Research Group, College of Medical Technology, Chengdu University of Traditional Chinese Medicine, Chengdu, 610072, Sichuan, China
| | - Taishen Wen
- Sichuan Provincial Key Laboratory for Genetic Disease, Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, 611731, Sichuan, China
| | - Haiping Jia
- Department of Immunology, North Sichuan Medical College, Nanchong, 637100, Sichuan, China
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Duarte GP, da Cunha JR. Ruptured popliteal artery aneurysm in a patient with a clinical diagnosis of Marfan syndrome. J Vasc Bras 2020; 19:e20200017. [PMID: 34290752 PMCID: PMC8276642 DOI: 10.1590/1677-5449.200017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 05/28/2020] [Indexed: 11/22/2022] Open
Abstract
The popliteal artery is the main site of occurrence of peripheral aneurysms. Acute presentations constitute a potential threat to limb viability and to life, especially in the event of rupture. Rupture is a rare event, but one that demands an immediate intervention decision to achieve a satisfactory treatment outcome. The gold standard treatment is conventional surgery, effecting repair by interposition of a great saphenous vein graft. Studies conducted in recent decades have found associations between Marfan Syndrome and peripheral aneurysms. This report presents a case of a ruptured left popliteal artery aneurysm successfully treated in an 82-year-old patient clinically diagnosed with previously unknown Marfan syndrome.
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Affiliation(s)
- Gabriel Paiva Duarte
- Universidade Federal Fluminense - UFF, Faculdade de Medicina, Niterói, RJ, Brasil
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Fang G, Miao J, Peng Y, Zhai Y, Wang C, Zhao X, Wang Y, Dong J. Identification of Three FBN1 Mutations in Chinese Patients with Typical or Incomplete Marfan Syndrome by Whole-Exome Sequencing. CARDIOVASCULAR INNOVATIONS AND APPLICATIONS 2020. [DOI: 10.15212/cvia.2019.0576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Objective: The purpose of this work was to obtain the phenotypes and detect potential mutations in three Chinese patients with Marfan syndrome (MFS) or incomplete MFS phenotypes.Methods: Three unrelated patients with a definite or suspected clinical diagnosis of MFS
and their family members were recruited for research. Genomic DNA was extracted from peripheral blood of these patients and their family members. All the exons were sequenced by next-generation sequencing and the variants were further validated by Sanger sequencing. The functional consequences
of the mutations were analyzed with various genomic resources and bioinformatics tools.Results: Three FBN1 mutations were identified in the three patients, including one novel mutation (2125G > A) and two previously reported mutations (4786C > T and 6325C > T). It
was interesting to note that the parents of these patients were normal as assessed by clinical features or genetic testing, but all these mutations were detected in their offspring, except for the variant 6325C > T. We also found that a few young members of the family of probands (proband
1 and proband 2) have exhibited no manifestations of MFS so far, although they carry the same disease-causing mutation.Conclusions: We found three FBN1 mutations in three unrelated Chinese families with MFS by genome sequencing, and the relationship between genotypes and
phenotypes in MFS patients needs further exploration.
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Affiliation(s)
- Guangming Fang
- Department of Cardiology, The First Affiliated Hospital, Zhengzhou University, Zhengzhou, Henan 450052, P. R. China
| | - Jinxin Miao
- Academy of Chinese Medical Sciences, Henan University of Chinese Medicine, Zhengzhou, Henan 450046, P. R. China
| | - Ying Peng
- Department of Cardiology, The First Affiliated Hospital, Zhengzhou University, Zhengzhou, Henan 450052, P. R. China
| | - Yafei Zhai
- Department of Cardiology, The First Affiliated Hospital, Zhengzhou University, Zhengzhou, Henan 450052, P. R. China
| | - Chuchu Wang
- College of Life Sciences, Zhengzhou University, Zhengzhou, Henan 450000, P. R. China
| | - Xiaoyan Zhao
- Department of Cardiology, The First Affiliated Hospital, Zhengzhou University, Zhengzhou, Henan 450052, P. R. China
| | - Yaohe Wang
- Sino-British Research Center for Molecular Oncology, National Center for the International Research in Cell and Gene Therapy, School of Basic Sciences, Academy of Medical Sciences, Zhengzhou University, Zhengzhou, Henan 450052, P. R. China
| | - Jianzeng Dong
- Department of Cardiology, The First Affiliated Hospital, Zhengzhou University, Zhengzhou, Henan 450052, P. R. China
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Stark VC, Hensen F, Kutsche K, Kortüm F, Olfe J, Wiegand P, von Kodolitsch Y, Kozlik-Feldmann R, Müller GC, Mir TS. Genotype-Phenotype Correlation in Children: The Impact of FBN1 Variants on Pediatric Marfan Care. Genes (Basel) 2020; 11:genes11070799. [PMID: 32679894 PMCID: PMC7397236 DOI: 10.3390/genes11070799] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 07/08/2020] [Accepted: 07/13/2020] [Indexed: 12/21/2022] Open
Abstract
Currently, no reliable genotype–phenotype correlation is available for pediatric Marfan patients in everyday clinical practice. We investigated correlations of FBN1 variants with the prevalence and age of onset of Marfan manifestations in childhood and differentiated three groups: missense/in-frame, splice, and nonsense/frameshift variants. In addition, we differentiated missense variants destroying or generating a cysteine (cys-missense) and alterations not affecting cysteine. We categorized 105 FBN1-positive pediatric patients. Patients with cys-missense more frequently developed aortic dilatation (p = 0.03) requiring medication (p = 0.003), tricuspid valve prolapse (p = 0.03), and earlier onset of myopia (p = 0.02) than those with other missense variants. Missense variants correlated with a higher prevalence of ectopia lentis (p = 0.002) and earlier onset of pulmonary artery dilatation (p = 0.03) than nonsense/frameshift, and dural ectasia was more common in the latter (p = 0.005). Pectus excavatum (p = 0.007) appeared more often in patients with splice compared with missense/in-frame variants, while hernia (p = 0.04) appeared earlier in the latter. Findings on genotype–phenotype correlations in Marfan-affected children can improve interdisciplinary therapy. In patients with cys-missense variants, early medical treatment of aortic dilatation seems reasonable and early regular ophthalmologic follow-up essential. Patients with nonsense/frameshift and splice variants require early involvement of orthopedic specialists to support the growing child.
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Affiliation(s)
- Veronika C. Stark
- Pediatric Cardiology, University Heart and Vascular Center Hamburg, Martinistrasse 52, 20246 Hamburg, Germany; (F.H.); (J.O.); (P.W.); (R.K.-F.); (G.C.M.); (T.S.M.)
- Correspondence:
| | - Flemming Hensen
- Pediatric Cardiology, University Heart and Vascular Center Hamburg, Martinistrasse 52, 20246 Hamburg, Germany; (F.H.); (J.O.); (P.W.); (R.K.-F.); (G.C.M.); (T.S.M.)
| | - Kerstin Kutsche
- Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Martinistrasse 52, 20246 Hamburg, Germany; (K.K.); (F.K.)
| | - Fanny Kortüm
- Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Martinistrasse 52, 20246 Hamburg, Germany; (K.K.); (F.K.)
| | - Jakob Olfe
- Pediatric Cardiology, University Heart and Vascular Center Hamburg, Martinistrasse 52, 20246 Hamburg, Germany; (F.H.); (J.O.); (P.W.); (R.K.-F.); (G.C.M.); (T.S.M.)
| | - Peter Wiegand
- Pediatric Cardiology, University Heart and Vascular Center Hamburg, Martinistrasse 52, 20246 Hamburg, Germany; (F.H.); (J.O.); (P.W.); (R.K.-F.); (G.C.M.); (T.S.M.)
| | - Yskert von Kodolitsch
- Cardiology, University Heart and Vascular Center Hamburg, Martinistrasse 52, 20246 Hamburg, Germany;
| | - Rainer Kozlik-Feldmann
- Pediatric Cardiology, University Heart and Vascular Center Hamburg, Martinistrasse 52, 20246 Hamburg, Germany; (F.H.); (J.O.); (P.W.); (R.K.-F.); (G.C.M.); (T.S.M.)
| | - Götz C. Müller
- Pediatric Cardiology, University Heart and Vascular Center Hamburg, Martinistrasse 52, 20246 Hamburg, Germany; (F.H.); (J.O.); (P.W.); (R.K.-F.); (G.C.M.); (T.S.M.)
| | - Thomas S. Mir
- Pediatric Cardiology, University Heart and Vascular Center Hamburg, Martinistrasse 52, 20246 Hamburg, Germany; (F.H.); (J.O.); (P.W.); (R.K.-F.); (G.C.M.); (T.S.M.)
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