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Zhou Y, Guo D, Cao Q, Zhang X, Jin G, Zheng D. Genotype variant screening and phenotypic analysis of FBN1 in Chinese patients with isolated ectopia lentis. Mol Med Rep 2021; 23:275. [PMID: 33576469 PMCID: PMC7893787 DOI: 10.3892/mmr.2021.11914] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 01/05/2021] [Indexed: 01/28/2023] Open
Abstract
Isolated ectopia lentis (IEL) can lead to blindness as result of severe complications, such as retinal detachment and secondary glaucoma. Pathogenic variants in the fibrillin 1 (FBN1) gene are a common cause of IEL. The aim of the present study was to investigate the frequency of pathogenic FBN1 variants in twelve probands with IEL and to evaluate their associated phenotypes. Systemic clinical examination of the twelve probands indicated that all had bilateral EL with a median age at diagnosis of three years. High myopia was the most common feature among the probands (83.3%; 10/12 cases). No extraocular symptoms (either cardiovascular or skeletal) were observed among these patients. Genomic DNA was extracted from peripheral blood leukocytes from all patients for targeted exome sequencing. Seven heterozygous missense variants in FBN1 were identified by bioinformatics analysis and further verified using Sanger sequencing. The seven variants were all classified as pathogenic after segregation analysis on available family members according to the American College of Medical Genetics and Genomics standards and guidelines. Of the seven variants, three were novel, namely c.2179T>C, c.2496T>G and c.3346G>C. The remaining four, namely c.184C>T, c.367T>C, c.1879C>T and c.4096G>A have been reported in previous studies. The seven pathogenic variants were identified in 8/12 (66.7%) probands with IEL. These results expand the variant spectrum of the FBN1 gene as well as the understanding of the molecular pathogenesis of IEL.
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Affiliation(s)
- Yijing Zhou
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat‑sen University, Guangzhou, Guangdong 510060, P.R. China
| | - Dongwei Guo
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat‑sen University, Guangzhou, Guangdong 510060, P.R. China
| | - Qianzhong Cao
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat‑sen University, Guangzhou, Guangdong 510060, P.R. China
| | - Xinyu Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat‑sen University, Guangzhou, Guangdong 510060, P.R. China
| | - Guangming Jin
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat‑sen University, Guangzhou, Guangdong 510060, P.R. China
| | - Danying Zheng
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat‑sen University, Guangzhou, Guangdong 510060, P.R. China
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Li Y, Gao S, Han Y, Song L, Kong Y, Jiao Y, Huang S, Du J, Li Y. Variants of Focal Adhesion Scaffold Genes Cause Thoracic Aortic Aneurysm. Circ Res 2020; 128:8-23. [PMID: 33092471 DOI: 10.1161/circresaha.120.317361] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
RATIONALE Thoracic aortic aneurysm (TAA) leads to substantial mortality worldwide. Familial and syndromic TAAs are highly correlated with genetics. However, the incidence of sporadic isolated TAA (iTAA) is much higher, and the genetic contribution is not yet clear. OBJECTIVE Here, we examined the genetic characteristics of sporadic iTAA. METHODS AND RESULTS We performed a genetic screen of 551 sporadic iTAA cases and 1071 controls via whole-exome sequencing. The prevalence of pathogenic mutations in known causal genes was 5.08% in the iTAA cohort. We selected 100 novel candidate genes using a strict strategy, and the suspected functional variants of these genes were significantly enriched in cases compared with controls and carried by 60.43% of patients. We found more severe phenotypes and a lower proportion of hypertension in cases with pathogenic mutations or suspected functional variants. Among the candidate genes, Testin (TES), which encodes a focal adhesion scaffold protein, was identified as a potential TAA causal gene, accounting for 4 patients with 2 missense variants in the LIM1 domain (c.751T>C encoding p.Y251H; c.838T>C encoding p.Y280H) and highly expressed in the aorta. The 2 variants led to a decrease in TES expression. The thoracic aorta was spontaneously dilated in the TesY249H knock-in and Tes-/- mice. Mechanistically, the p.Y249H variant or knockdown of TES led to the repression of vascular smooth muscle cell contraction genes and disturbed the vascular smooth muscle cell contractile phenotype. Interestingly, suspected functional variants of other focal adhesion scaffold genes, including TLN1 (Talin-1) and ZYX (zyxin), were also significantly enriched in patients with iTAA; moreover, their knockdown resulted in decreased contractility of vascular smooth muscle cells. CONCLUSIONS For the first time, this study revealed the genetic landscape across iTAA and showed that the focal adhesion scaffold genes are critical in the pathogenesis of iTAA.
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Affiliation(s)
- Yang Li
- Beijing Anzhen Hospital, Capital Medical University, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,Beijing Institute of Heart, Lung and Blood Vessel Disease, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,The Key Laboratory of Remodeling-Related Cardiovascular Diseases, Ministry of Education, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li)
| | - Shijuan Gao
- Beijing Anzhen Hospital, Capital Medical University, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,Beijing Institute of Heart, Lung and Blood Vessel Disease, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,The Key Laboratory of Remodeling-Related Cardiovascular Diseases, Ministry of Education, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li)
| | - Yingchun Han
- Beijing Anzhen Hospital, Capital Medical University, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,Beijing Institute of Heart, Lung and Blood Vessel Disease, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,The Key Laboratory of Remodeling-Related Cardiovascular Diseases, Ministry of Education, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li)
| | - Li Song
- BGI Genomics, BGI-Shenzhen, China (Li Song)
| | - Yu Kong
- Beijing Anzhen Hospital, Capital Medical University, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,Beijing Institute of Heart, Lung and Blood Vessel Disease, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,The Key Laboratory of Remodeling-Related Cardiovascular Diseases, Ministry of Education, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li)
| | - Yao Jiao
- Beijing Anzhen Hospital, Capital Medical University, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,Beijing Institute of Heart, Lung and Blood Vessel Disease, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,The Key Laboratory of Remodeling-Related Cardiovascular Diseases, Ministry of Education, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li)
| | - Shan Huang
- Beijing Anzhen Hospital, Capital Medical University, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,Beijing Institute of Heart, Lung and Blood Vessel Disease, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,The Key Laboratory of Remodeling-Related Cardiovascular Diseases, Ministry of Education, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li)
| | - Jie Du
- Beijing Anzhen Hospital, Capital Medical University, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,Beijing Institute of Heart, Lung and Blood Vessel Disease, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,The Key Laboratory of Remodeling-Related Cardiovascular Diseases, Ministry of Education, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li)
| | - Yulin Li
- Beijing Anzhen Hospital, Capital Medical University, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,Beijing Institute of Heart, Lung and Blood Vessel Disease, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li).,The Key Laboratory of Remodeling-Related Cardiovascular Diseases, Ministry of Education, China (Yang Li, S.G., Y.H., Y.K., Y.J., S.H., J.D., Yulin Li)
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3
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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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4
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Xu S, Li L, Fu Y, Wang X, Sun H, Wang J, Han L, Wu Z, Liu Y, Zhu J, Sun L, Lan F, He Y, Zhang H. Increased frequency of FBN1 frameshift and nonsense mutations in Marfan syndrome patients with aortic dissection. Mol Genet Genomic Med 2019; 8:e1041. [PMID: 31830381 PMCID: PMC6978253 DOI: 10.1002/mgg3.1041] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 10/08/2019] [Accepted: 10/11/2019] [Indexed: 11/20/2022] Open
Abstract
Background Marfan syndrome (MFS) is an inherited connective tissue disease that mainly involves Fibrillin‐1 (FBN1) mutations and aortic manifestations. In this study, we investigated the correlations between the FBN1 genotype–phenotype and aortic events (aortic dissection and aortic aneurysm) in patients with Marfan syndrome. Methods Genotype and phenotype information was evaluated in 180 patients with MFS. DNA sequencing was performed on each patient. According to the clinical manifestation, these patients were split into two groups: the aortic dissection group and the aortic aneurysm group. Aortic wall tissue was obtained from Marfan patients who underwent surgery and was used for staining. Results A total of 180 patients with FBN1 mutations were grouped into four categories: 90 with missense mutations, 32 with splicing mutations, 29 with frameshift mutations, and 29 with nonsense mutations. There was a significantly higher frequency of frameshift and nonsense mutations observed in aortic dissection than in aortic aneurysm (25.58% vs. 4.35%, p = .005; 25.58% vs. 8.70%, p = .033, respectively;), while missense mutations showed a higher frequency in aortic aneurysm than in aortic dissection (69.57% vs. 32.56%, respectively; p < .001) and a higher rate of lens dislocation (34.78% vs. 13.95%, respectively; p = .008). Pathological staining showed that elastic fibers were sparser in patients with a frameshift and nonsense mutations, and the smooth muscle cells were sparser and more disorganized than those observed in patients with missense mutations. Conclusion This study showed that FBN1 gene frameshift and nonsense mutations are more common in patients with aortic dissection and may have meaningful guidance for the treatment of Marfan syndrome patients.
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Affiliation(s)
- Shijun Xu
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing, China.,Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing, China.,Beijing Lab for Cardiovascular Precision Medicine, Beijing, China.,Beijing Aortic Disease Center, Cardiovascular Surgery Center, Beijing, China.,Beijing Engineering Research Center for Vascular Prostheses, Beijing, China
| | - Lei Li
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing, China.,Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing, China.,Beijing Lab for Cardiovascular Precision Medicine, Beijing, China.,Beijing Aortic Disease Center, Cardiovascular Surgery Center, Beijing, China.,Beijing Engineering Research Center for Vascular Prostheses, Beijing, China
| | - Yuwei Fu
- Department of Echocardiography, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Xin Wang
- Department of Echocardiography, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Hairui Sun
- Department of Echocardiography, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Jianbin Wang
- Department of Echocardiography, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Lu Han
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing, China.,Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing, China.,Beijing Lab for Cardiovascular Precision Medicine, Beijing, China.,Beijing Aortic Disease Center, Cardiovascular Surgery Center, Beijing, China.,Beijing Engineering Research Center for Vascular Prostheses, Beijing, China
| | - Zining Wu
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing, China.,Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing, China.,Beijing Lab for Cardiovascular Precision Medicine, Beijing, China.,Beijing Aortic Disease Center, Cardiovascular Surgery Center, Beijing, China.,Beijing Engineering Research Center for Vascular Prostheses, Beijing, China
| | - Yongmin Liu
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing, China.,Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing, China.,Beijing Lab for Cardiovascular Precision Medicine, Beijing, China.,Beijing Aortic Disease Center, Cardiovascular Surgery Center, Beijing, China.,Beijing Engineering Research Center for Vascular Prostheses, Beijing, China
| | - Junming Zhu
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing, China.,Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing, China.,Beijing Lab for Cardiovascular Precision Medicine, Beijing, China.,Beijing Aortic Disease Center, Cardiovascular Surgery Center, Beijing, China.,Beijing Engineering Research Center for Vascular Prostheses, Beijing, China
| | - Lizhong Sun
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing, China.,Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing, China.,Beijing Lab for Cardiovascular Precision Medicine, Beijing, China.,Beijing Aortic Disease Center, Cardiovascular Surgery Center, Beijing, China.,Beijing Engineering Research Center for Vascular Prostheses, Beijing, China
| | - Feng Lan
- Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing, China.,Beijing Lab for Cardiovascular Precision Medicine, Beijing, China
| | - Yihua He
- Beijing Lab for Cardiovascular Precision Medicine, Beijing, China.,Department of Echocardiography, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Hongjia Zhang
- Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing, China.,Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing, China.,Beijing Lab for Cardiovascular Precision Medicine, Beijing, China.,Beijing Aortic Disease Center, Cardiovascular Surgery Center, Beijing, China.,Beijing Engineering Research Center for Vascular Prostheses, Beijing, China
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Detection of ten novel FBN1 mutations in Chinese patients with typical or incomplete Marfan syndrome and an overview of the genotype-phenotype correlations. Int J Cardiol 2019; 293:186-191. [PMID: 31279664 DOI: 10.1016/j.ijcard.2019.06.066] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 06/09/2019] [Accepted: 06/24/2019] [Indexed: 12/20/2022]
Abstract
OBJECTIVE The aim of this study is to identify the mutation spectrum of FBN1 in patients with Marfan syndrome (MFS) or Marfan-Like Phenotypes and to analyze the genotype-phenotype correlations of existing literature. METHODS AND RESULTS A total of 21 unrelated patients with a definite or suspected clinical diagnosis of MFS were recruited for research. Eleven FBN1 mutations were identified in 12 patients who strictly fulfilled the Ghent criteria for MFS, and 1 FBN1 mutations were detected in 9 patients with suspected MFS by screening the mutations of FBN1. These FBN1 mutations include 10 novel mutations (c.357 C>A, c.493 C>T, c.1374 T>A, c.4143 delG, c. 6987 C>G, c.7238 G>A, c. 7765 A>G, c.8200 A>G, c. 8431 G>A, c.8547 T>G,) and 2 previously reported mutations (c.4567 C>T, c.4615 C>T). By searching PubMed and Embase (from 1990 up to December 2018), twenty nine studies (including the present study) with 890 subjects with MFS or Marfan-like phenotypes were included to analyze the genotype-phenotype correlations. Several genotype-phenotype correlations were founded. Firstly, mutations of premature termination codons (PTC) were associated with an increased risk of major cardiovascular involvements. Secondly, the frequency of patients with major cardiovascular involvement in exons 43-65 group was as high as that in exons 24-32 group (71.4% vs. 77.0%; p = 0.238). Finally, cysteine missense mutations might be associated with major cardiovascular involvements. CONCLUSIONS These results extended the FBN1 mutation spectrum of this rare disease and revealed the genotype-phenotype correlations in MFS by analyzing existing literature.
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Gong B, Yang L, Wang Q, Ye Z, Guo X, Yang C, Hao F, Shi Y, Huang Y, Qu C, Yang Z. Mutation screening in the FBN1 gene responsible for Marfan syndrome and related disorder in Chinese families. Mol Genet Genomic Med 2019; 7:e00594. [PMID: 30838813 PMCID: PMC6465674 DOI: 10.1002/mgg3.594] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 01/08/2019] [Accepted: 01/09/2019] [Indexed: 01/29/2023] Open
Abstract
Background Previous studies showed that the fibrillin‐1 gene (FBN1) is responsible for Marfan sydrome (MFS) pathogenesis. This study is conducted to screen for mutations in the FBN1 gene in Chinese families with MFS. Methods Eight families with MFS and related disorder were recruited in this study. All available family members underwent complete physical, ophthalmic, and cardiovascular examination. Mutation screening was performed using targeted next‐generation sequencing. Candidate variants were amplified by polymerase chain reaction and verified by direct Sanger sequencing. Results Four novel heterozygous mutations in FBN1, including c.2861G>T (p.R954L), c.4087G>A (p.D1363N), c.4987T>G (p.C1663G), and c.5032T>G (p.Y1678D), as well as four known mutations, c.3617G>A (p.G1206D), c.4460A>G (p.D1487G), c.4588C>T (p.R1530C), and c.718C>T (p.R240C) were identified. Affected patients from each family were found to carry one of the mutations, whereas the unaffected members and 1,086 normal controls were not. Each mutation was found to be cosegregated with MFS phenotype and related disorder in each family. Multiple sequence alignment of the human fibrillin‐1 protein showed that these mutations occurred in a highly conserved region among different species. Conclusions Eight FBN1 mutations were identified in Chinese families with MFS and related disorder. These data expands FBN1 mutation spectrum and further emphasizes the role of FBN1 in the pathogenesis of MFS.
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Affiliation(s)
- Bo Gong
- Sichuan Provincial Key Laboratory for Disease Gene Study and Department of Laboratory Medicine, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China.,Institute of Chengdu Biology, Sichuan Translational Medicine Hospital, Chinese Academy of Sciences, Chengdu, Sichuan, China
| | - Lan Yang
- Department of Ophthalmology, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China.,School of Clinic Medicine, Southwest Medical University, Luzhou, Sichuan, China
| | - Qingwei Wang
- Sichuan Provincial Key Laboratory for Disease Gene Study and Department of Laboratory Medicine, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China.,Institute of Chengdu Biology, Sichuan Translational Medicine Hospital, Chinese Academy of Sciences, Chengdu, Sichuan, China
| | - Zimeng Ye
- School of Medicine, Dentistry and Health Sciences, The University of Melbourne, Melbourne, Victoria, Australia
| | - Xiaoxin Guo
- Sichuan Provincial Key Laboratory for Disease Gene Study and Department of Laboratory Medicine, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
| | - Chen Yang
- Sichuan Provincial Key Laboratory for Disease Gene Study and Department of Laboratory Medicine, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
| | - Fang Hao
- Sichuan Provincial Key Laboratory for Disease Gene Study and Department of Laboratory Medicine, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
| | - Yi Shi
- Sichuan Provincial Key Laboratory for Disease Gene Study and Department of Laboratory Medicine, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
| | - Yi Huang
- Sichuan Provincial Key Laboratory for Disease Gene Study and Department of Laboratory Medicine, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
| | - Chao Qu
- Institute of Chengdu Biology, Sichuan Translational Medicine Hospital, Chinese Academy of Sciences, Chengdu, Sichuan, China.,Department of Ophthalmology, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China
| | - Zhenglin Yang
- Sichuan Provincial Key Laboratory for Disease Gene Study and Department of Laboratory Medicine, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China.,Institute of Chengdu Biology, Sichuan Translational Medicine Hospital, Chinese Academy of Sciences, Chengdu, Sichuan, China
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Ergoren MC, Turkgenc B, Teralı K, Rodoplu O, Verstraeten A, Van Laer L, Mocan G, Loeys B, Tetik O, Temel SG. Identification and characterization of a novel FBN1 gene variant in an extended family with variable clinical phenotype of Marfan syndrome. Connect Tissue Res 2019; 60:146-154. [PMID: 29732924 DOI: 10.1080/03008207.2018.1472589] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Marfan syndrome (MFS) is a multi-systemic autosomal dominant condition caused by mutations in the gene (FBN1) coding for fibrillin-1. Mutations have been associated with a wide range of overlapping phenotypes. Here, we report on an extended family presenting with skeletal, ocular and cardiovascular clinical features. The 37-year-old male propositus, who had chest pain, dyspnea and shortness of breath, was first diagnosed based on the revised Ghent criteria and then subjected to molecular genetic analyses. FBN1 sequencing of the proband as well as available affected family members revealed the presence of a novel variant, c.7828G>C (p.Glu2610Gln), which was not present in any of the unaffected family members. In silico analyses demonstrated that the Glu2610 residue is part of the conserved DINE motif found at the beginning of each cbEGF domain of FBN1. The substitution of Glu2610 with Gln decreased fibrillin-1 production accordingly. Despite the fact that this variation appears to be primarily responsible for the etiology of MFS in the present family, our findings suggest that variable clinical expressions of the disease phenotype should be considered critically by the physicians.
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Affiliation(s)
- Mahmut Cerkez Ergoren
- a Department of Medical Biology, Faculty of Medicine , Near East University , Nicosia , Cyprus
| | - Burcu Turkgenc
- b Acibadem Genetic Diagnostic Center , Istanbul , Turkey
| | - Kerem Teralı
- c Department of Medical Biochemistry, Faculty of Medicine , Near East University , Nicosia , Cyprus
| | - Orhan Rodoplu
- d Department of Cardiovascular Surgery , Private Yalova Hospital , Yalova , Turkey
| | - Aline Verstraeten
- e Center for Medical Genetics , Antwerp University Hospital/University of Antwerp , Antwerp , Belgium
| | - Lut Van Laer
- e Center for Medical Genetics , Antwerp University Hospital/University of Antwerp , Antwerp , Belgium
| | - Gamze Mocan
- f Department of Pathology, Faculty of Medicine , Near East University , Nicosia , Cyprus
| | - Bart Loeys
- e Center for Medical Genetics , Antwerp University Hospital/University of Antwerp , Antwerp , Belgium
| | - Omer Tetik
- g Department of Cardiovascular Surgery , Celal Bayar University , Manisa , Turkey
| | - Sehime G Temel
- h Department of Histology and Embryology , Uludağ University , Bursa , Turkey.,i Department of Medical Genetics , Uludağ University , Bursa , Turkey.,j Department of Histology & Embryology, Faculty of Medicine , Near East University , Nicosia , Cyprus
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8
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Zhou S, Wang F, Dou Y, Zhou J, Hao G, Xu C, Wang QK, Wang H, Wang P. A novel FBN2 mutation cosegregates with congenital contractural arachnodactyly in a five-generation Chinese family. Clin Case Rep 2018; 6:1612-1617. [PMID: 30147916 PMCID: PMC6099051 DOI: 10.1002/ccr3.1693] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 05/06/2018] [Accepted: 06/11/2018] [Indexed: 12/17/2022] Open
Abstract
We identified a novel heterozygous mutation (c.4177T>G and p.Cys1393Gly) in FBN2 that cosegregated with congenital contractural arachnodactyly (CCA) in a five-generation Chinese family. This mutation may cause the loss of the disulfide bond between Cys 1393 and Cys 1378 residues of fibrillin-2. Our study expands the genetic profile of CCA.
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Affiliation(s)
- Shiyuan Zhou
- Henan Provincial Research Institute for Population and Family PlanningZhengzhouChina
- Key Laboratory of Birthdefects PreventionNational Health and Family Planning CommissionZhengzhouChina
| | - Fengyu Wang
- Henan Provincial Research Institute for Population and Family PlanningZhengzhouChina
- Key Laboratory of Birthdefects PreventionNational Health and Family Planning CommissionZhengzhouChina
| | - Yongheng Dou
- Henan Provincial Research Institute for Population and Family PlanningZhengzhouChina
- Key Laboratory of Birthdefects PreventionNational Health and Family Planning CommissionZhengzhouChina
| | - Jiping Zhou
- Henan Provincial Research Institute for Population and Family PlanningZhengzhouChina
- Key Laboratory of Birthdefects PreventionNational Health and Family Planning CommissionZhengzhouChina
| | - Gefang Hao
- Henan Provincial Research Institute for Population and Family PlanningZhengzhouChina
- Key Laboratory of Birthdefects PreventionNational Health and Family Planning CommissionZhengzhouChina
| | - Chengqi Xu
- College of Life Science and Technology and Human Genome Research CenterHuazhong University of Science and TechnologyWuhanChina
| | - Qing K. Wang
- College of Life Science and Technology and Human Genome Research CenterHuazhong University of Science and TechnologyWuhanChina
| | - Haili Wang
- Henan Provincial Research Institute for Population and Family PlanningZhengzhouChina
- Key Laboratory of Birthdefects PreventionNational Health and Family Planning CommissionZhengzhouChina
| | - Pengyun Wang
- Department of Clinical LaboratoryLiyuan HospitalTongji Medical CollageHuazhong University of Science and TechnologyWuhanChina
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