1
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Yang S, Li Z. FBN2 pathogenic variants in congenital contractural arachnodactyly with severe cardiovascular manifestations. Connect Tissue Res 2024; 65:214-225. [PMID: 38602424 DOI: 10.1080/03008207.2024.2340004] [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: 10/28/2023] [Accepted: 04/02/2024] [Indexed: 04/12/2024]
Abstract
PURPOSE Congenital contractural arachnodactyly (CCA) is an extremely rare autosomal dominant connective tissue genetic disorder caused by pathogenic variants in FBN2. CCA is characterized by arachnodactyly, camptodactyly, contracture of major joints, scoliosis, pectus deformities, and crumpled ears, but rarely with lethal cardiovascular manifestations as in Marfan syndrome. It is imperative to conduct a comprehensive analysis and review of the pathogenesis of CCA resulting from pathogenic variants in FBN2 gene. MATERIALS AND METHODS Using whole-exome sequencing and Sanger sequencing, we identified a novel pathogenic splice-altering variant (c.4472-3C>A) in intron 34 of FBN2 gene in a CCA pedigree. The transcriptional result of the splicing-altering variant was analyzed by RNA sequencing. We systematically analyzed the clinical manifestations of all reported cases of CCA caused by splicing-altering pathogenic variants and focused on all the pathogenic variants in FBN2 gene that are associated with severe cardiovascular manifestations. RESULTS The splice-altering variant (c.4472-3C>A) in FBN2 was demonstrated to result in the exon 35 skipping and cause an in-frame deletion. Furthermore, we identified exons 31 to 35 may be a hotspot region in FBN2 gene associated with severe cardiovascular phenotype. CONCLUSIONS This study enriched the pathogenic spectrum of CCA and identified a hotspot region in FBN2 gene associated with severe cardiovascular manifestations. We recommend that patients carrying pathogenic variants in exons 31 to 35 of FBN2 pay more attention to cardiac evaluation.
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Affiliation(s)
- Shulin Yang
- Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zongzhe Li
- Division of Cardiology, Departments of Internal Medicine and Genetic Diagnosis Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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2
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Wang Z, Chen W, Zuo L, Xu M, Wu Y, Huang J, Zhang X, Li Y, Wang J, Chen J, Wang H, Sun H. The Fibrillin-1/VEGFR2/STAT2 signaling axis promotes chemoresistance via modulating glycolysis and angiogenesis in ovarian cancer organoids and cells. Cancer Commun (Lond) 2022; 42:245-265. [PMID: 35234370 PMCID: PMC8923131 DOI: 10.1002/cac2.12274] [Citation(s) in RCA: 61] [Impact Index Per Article: 30.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 10/31/2021] [Accepted: 02/07/2022] [Indexed: 12/14/2022] Open
Abstract
Background Chemotherapy resistance is a primary reason of ovarian cancer therapy failure; hence it is important to investigate the underlying mechanisms of chemotherapy resistance and develop novel potential therapeutic targets. Methods RNA sequencing of cisplatin‐resistant and ‐sensitive (chemoresistant and chemosensitive, respectively) ovarian cancer organoids was performed, followed by detection of the expression level of fibrillin‐1 (FBN1) in organoids and clinical specimens of ovarian cancer. Subsequently, glucose metabolism, angiogenesis, and chemosensitivity were analyzed in structural glycoprotein FBN1‐knockout cisplatin‐resistant ovarian cancer organoids and cell lines. To gain insights into the specific functions and mechanisms of action of FBN1 in ovarian cancer, immunoprecipitation, silver nitrate staining, mass spectrometry, immunofluorescence, Western blotting, and Fӧrster resonance energy transfer‐fluorescence lifetime imaging analyses were performed, followed by in vivo assays using vertebrate model systems of nude mice and zebrafish. Results FBN1 expression was significantly enhanced in cisplatin‐resistant ovarian cancer organoids and tissues, indicating that FBN1 might be a key factor in chemoresistance of ovarian cancer. We also discovered that FBN1 sustained the energy stress and induced angiogenesis in vitro and in vivo, which promoted the cisplatin‐resistance of ovarian cancer. Knockout of FBN1 combined with treatment of the antiangiogenic drug apatinib improved the cisplatin‐sensitivity of ovarian cancer cells. Mechanistically, FBN1 mediated the phosphorylation of vascular endothelial growth factor receptor 2 (VEGFR2) at the Tyr1054 residue, which activated its downstream focal adhesion kinase (FAK)/protein kinase B (PKB or AKT) pathway, induced the phosphorylation of signal transducer and activator of transcription 2 (STAT2) at the tyrosine residue 690 (Tyr690), promoted the nuclear translocation of STAT2, and ultimately altered the expression of genes associated with STAT2‐mediated angiogenesis and glycolysis. Conclusions The FBN1/VEGFR2/STAT2 signaling axis may induce chemoresistance of ovarian cancer cells by participating in the process of glycolysis and angiogenesis. The present study suggested a novel FBN1‐targeted therapy and/or combination of FBN1 inhibition and antiangiogenic drug for treating ovarian cancer.
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Affiliation(s)
- Ziliang Wang
- Department of Obstetrics and Gynecology, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200092, P. R. China.,Institute of Cancer Research and Department of Gynecology, Shanghai Municipal Hospital of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200071, P. R. China
| | - Wei Chen
- Department of Reproductive Medicine Center, Zhongshan Hospital, Fudan University, Shanghai, 200032, P. R. China
| | - Ling Zuo
- Institute of Cancer Research and Department of Gynecology, Shanghai Municipal Hospital of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200071, P. R. China
| | - Midie Xu
- Department of Pathology and Biobank, Fudan University Shanghai Cancer Center, Shanghai, 200032, P. R. China
| | - Yong Wu
- Department of Gynecological Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, P. R. China
| | - Jiami Huang
- Institute of Cancer Research and Department of Gynecology, Shanghai Municipal Hospital of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200071, P. R. China
| | - Xu Zhang
- Institute of Cancer Research and Department of Gynecology, Shanghai Municipal Hospital of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200071, P. R. China
| | - Yongheng Li
- Institute of Cancer Research and Department of Gynecology, Shanghai Municipal Hospital of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200071, P. R. China
| | - Jing Wang
- Department of Reproductive Medicine Center, Zhongshan Hospital, Fudan University, Shanghai, 200032, P. R. China
| | - Jing Chen
- Institute of Cancer Research and Department of Gynecology, Shanghai Municipal Hospital of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200071, P. R. China
| | - Husheng Wang
- Department of Obstetrics and Gynecology, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200092, P. R. China
| | - Huizhen Sun
- Department of Obstetrics and Gynecology, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, 200092, P. R. China
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3
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Adamo CS, Zuk AV, Sengle G. The fibrillin microfibril/elastic fibre network: A critical extracellular supramolecular scaffold to balance skin homoeostasis. Exp Dermatol 2020; 30:25-37. [PMID: 32920888 DOI: 10.1111/exd.14191] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 09/01/2020] [Accepted: 09/03/2020] [Indexed: 01/08/2023]
Abstract
Supramolecular networks composed of fibrillins (fibrillin-1 and fibrillin-2) and associated ligands form intricate cellular microenvironments which balance skin homoeostasis and direct remodelling. Fibrillins assemble into microfibrils which are not only indispensable for conferring elasticity to the skin, but also control the bioavailability of growth factors targeted to the extracellular matrix architecture. Fibrillin microfibrils (FMF) represent the core scaffolds for elastic fibre formation, and they also decorate the surface of elastic fibres and form independent networks. In normal dermis, elastic fibres are suspended in a three-dimensional basket-like lattice of FMF intersecting basement membranes at the dermal-epidermal junction and thus conferring pliability to the skin. The importance of FMF for skin homoeostasis is illustrated by the clinical features caused by mutations in the human fibrillin genes (FBN1, FBN2), summarized as "fibrillinopathies." In skin, fibrillin mutations result in phenotypes ranging from thick, stiff and fibrotic skin to thin, lax and hyperextensible skin. The most plausible explanation for this spectrum of phenotypic outcomes is that FMF regulate growth factor signalling essential for proper growth and homoeostasis of the skin. Here, we will give an overview about the current understanding of the underlying pathomechanisms leading to fibrillin-dependent fibrosis as well as forms of cutis laxa caused by mutational inactivation of FMF-associated ligands.
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Affiliation(s)
- Christin S Adamo
- Center for Biochemistry, Medical Faculty, University of Cologne, Cologne, Germany.,Department of Pediatrics and Adolescent Medicine, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Alexandra V Zuk
- Center for Biochemistry, Medical Faculty, University of Cologne, Cologne, Germany
| | - Gerhard Sengle
- Center for Biochemistry, Medical Faculty, University of Cologne, Cologne, Germany.,Department of Pediatrics and Adolescent Medicine, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany.,Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne, Germany.,Cologne Center for Musculoskeletal Biomechanics (CCMB), Cologne, Germany
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4
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Maya I, Kahana S, Agmon-Fishman I, Klein C, Matar R, Berger R, Shohat M, Basel-Salmon L, Sharony R, Sagi-Dain L. Based on a cohort of 52,879 microarrays, recurrent intragenic FBN2 deletion encompassing exons 1-8 does not cause Beals syndrome. Eur J Med Genet 2020; 63:104008. [PMID: 32702406 DOI: 10.1016/j.ejmg.2020.104008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 06/10/2020] [Accepted: 07/10/2020] [Indexed: 10/23/2022]
Abstract
INTRODUCTION Congenital contractural arachnodactyly (CCA) is a rare connective tissue disorder, associated with heterozygous mutations in the FBN2 gene. The objective of this study was to evaluate the prevalence of an intragenic deletion encompassing exons 1-8 of FBN2 gene in Israeli population. MATERIALS AND METHODS A search for intragenic FBN2 microdeletions was performed in two databases of chromosomal microarray analysis (CMA) - genetic laboratory of a tertiary medical center (the primary cohort) and one of the largest Israeli health maintenance organizations (replication cohort). RESULTS Overall, 52,879 microarray tests were searched for FBN2 microdeletions. The primary cohort constituted of 18,301 CMA tests, among which 33 intragenic FBN2 microdeletions in unrelated individuals were found (0.18%). Prenatal prevalence of this variant was 0.23% (28/12,604), and specifically in low risk pregnancies - 0.29% (22/7464). Of the 28 cases with known parental origin, 27 (96.4%) were of full or partial Ashkenazi Jewish ethnic background. The approximate allele incidence in the Ashkenazi Jewish origin was 0.4% (18/4961). Combined with the 34,578 CMA tests in the replication cohort, the overall frequency of FBN2 microdeletions was 0.24% (125/52,879). None of the pre- or postnatal cases had any clinical manifestations of CCA. DISCUSSION Intragenic FBN2 microdeletions are found in one of every 420 CMA analyses in Israeli population, and in particular one of every 340 low-risk pregnancies. Due to high allele incidence in Ashkenazi Jewish population (1:275), we suggest that FBN2 gene deletion detected by CMA among Ashkenazi Jews should be interpreted as benign copy number variant.
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Affiliation(s)
- Idit Maya
- Recanati Genetics Institute, Beilinson Hospital, Rabin Medical Center, Petach Tikva, Israel
| | - Sarit Kahana
- Recanati Genetics Institute, Beilinson Hospital, Rabin Medical Center, Petach Tikva, Israel
| | - Ifaat Agmon-Fishman
- Recanati Genetics Institute, Beilinson Hospital, Rabin Medical Center, Petach Tikva, Israel
| | - Cochava Klein
- Recanati Genetics Institute, Beilinson Hospital, Rabin Medical Center, Petach Tikva, Israel
| | - Reut Matar
- Recanati Genetics Institute, Beilinson Hospital, Rabin Medical Center, Petach Tikva, Israel
| | | | - Mordechai Shohat
- Maccabi Health Services, Rehovot, Israel; Bioinformatics Unit, Sheba Cancer Research Center, Sheba Medical Center, Tel Hashomer, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Ariel College, Israel
| | - Lina Basel-Salmon
- Recanati Genetics Institute, Beilinson Hospital, Rabin Medical Center, Petach Tikva, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Ariel College, Israel; Pediatric Genetics Unit, Schneider Children's Medical Center of Israel, Petah Tikva, Israel; Felsenstein Medical Research Center, Rabin Medical Center, Petah Tikva, Israel
| | - Reuven Sharony
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; The Genetics Institute, Department of Obstetrics and Gynecology, Meir Medical Center, Kfar Saba, Israel
| | - Lena Sagi-Dain
- Genetics Institute, Carmel Medical Center, Affiliated to the Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa, Israel.
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5
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Li J, Wang Y, Zhu X, Nie Y, Kuo Y, Guan S, Huang J, Lian Y, Zhao Y, Li R, Wei Y, Qiao J, Yan L. A novel pathogenic mutation in FBN2 associated with congenital contractural arachnodactyly for preimplantation genetic diagnosis. J Genet Genomics 2020; 47:281-284. [PMID: 32747207 DOI: 10.1016/j.jgg.2020.03.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 03/22/2020] [Accepted: 03/28/2020] [Indexed: 10/24/2022]
Affiliation(s)
- Jiaxin Li
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China
| | - Yuqian Wang
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China; Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China
| | - Xiaohui Zhu
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China; Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China
| | - Yanli Nie
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China; Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China
| | - Ying Kuo
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China; Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China
| | - Shuo Guan
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China; Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China
| | - Jin Huang
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China; Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China
| | - Ying Lian
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China; Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China
| | - Yangyu Zhao
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China; Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China
| | - Rong Li
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China; Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China
| | - Yuan Wei
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China
| | - Jie Qiao
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China; Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China; Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100191, China; Beijing Advanced Innovation Center for Genomics, Peking University, Beijing 100191, China
| | - Liying Yan
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China; Key Laboratory of Assisted Reproduction, Ministry of Education, Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China.
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6
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Xu P, Li R, Huang S, Sun M, Liu J, Niu Y, Zou Y, Li J, Gao M, Li X, Gao X, Gao Y. A Novel Splicing Mutation in the FBN2 Gene in a Family With Congenital Contractural Arachnodactyly. Front Genet 2020; 11:143. [PMID: 32184806 PMCID: PMC7058790 DOI: 10.3389/fgene.2020.00143] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 02/06/2020] [Indexed: 12/20/2022] Open
Abstract
Congenital contractural arachnodactyly (CCA) is an extremely rare monogenic disorder in humans, and the prevalence of CCA is estimated to be less than 1 in 10,000 worldwide. CCA is characterized by arachnodactyly, camptodactyly, the contracture of major joints, scoliosis, pectus deformities, and crumpled ears. Mutations in FBN2 (which encodes fibrillin-2) are responsible for causing this disease. A family with CCA was investigated in this study, and a novel variant, c.3724+3A > C (also identified as IVS28+3A > C), in FBN2 was found in nine patients from the family but was not found in seven unaffected relatives. Reverse transcription-PCR (RT-PCR) and complementary DNA (cDNA) sequencing data showed that exon 28 was skipped in the FBN2 gene. The FBN2 c.3724+3A > C variant led to an in-frame deletion during transcription, which eventually triggered CCA in the Chinese family.
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Affiliation(s)
- Peiwen Xu
- Center for Reproductive Medicine, Shandong University, Jinan, China.,National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Jinan, China.,The Key Laboratory for Reproductive Endocrinology of Ministry of Education, Jinan, China
| | - Ruirui Li
- Center for Reproductive Medicine, Shandong University, Jinan, China.,National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Jinan, China.,The Key Laboratory for Reproductive Endocrinology of Ministry of Education, Jinan, China
| | - Sexin Huang
- Center for Reproductive Medicine, Shandong University, Jinan, China.,National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Jinan, China.,The Key Laboratory for Reproductive Endocrinology of Ministry of Education, Jinan, China
| | - Menghan Sun
- School of Biological Science, University of California, Irvine, Irvine, CA, United States
| | - Jiaolong Liu
- Center for Reproductive Medicine, Shandong University, Jinan, China.,National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Jinan, China.,The Key Laboratory for Reproductive Endocrinology of Ministry of Education, Jinan, China
| | - Yuping Niu
- Center for Reproductive Medicine, Shandong University, Jinan, China.,National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Jinan, China.,The Key Laboratory for Reproductive Endocrinology of Ministry of Education, Jinan, China
| | - Yang Zou
- Center for Reproductive Medicine, Shandong University, Jinan, China.,National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Jinan, China.,The Key Laboratory for Reproductive Endocrinology of Ministry of Education, Jinan, China
| | - Jie Li
- Center for Reproductive Medicine, Shandong University, Jinan, China.,National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Jinan, China.,The Key Laboratory for Reproductive Endocrinology of Ministry of Education, Jinan, China
| | - Ming Gao
- Center for Reproductive Medicine, Shandong University, Jinan, China.,National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Jinan, China.,The Key Laboratory for Reproductive Endocrinology of Ministry of Education, Jinan, China
| | - Xiaolei Li
- Center for Reproductive Medicine, Shandong University, Jinan, China.,National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Jinan, China.,The Key Laboratory for Reproductive Endocrinology of Ministry of Education, Jinan, China
| | - Xuan Gao
- Center for Reproductive Medicine, Shandong University, Jinan, China.,National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Jinan, China.,The Key Laboratory for Reproductive Endocrinology of Ministry of Education, Jinan, China
| | - Yuan Gao
- Center for Reproductive Medicine, Shandong University, Jinan, China.,National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Jinan, China.,The Key Laboratory for Reproductive Endocrinology of Ministry of Education, Jinan, China
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7
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Najafi A, Caspar SM, Meienberg J, Rohrbach M, Steinmann B, Matyas G. Variant filtering, digenic variants, and other challenges in clinical sequencing: a lesson from fibrillinopathies. Clin Genet 2020; 97:235-245. [PMID: 31506931 PMCID: PMC7004123 DOI: 10.1111/cge.13640] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 09/04/2019] [Accepted: 09/07/2019] [Indexed: 12/23/2022]
Abstract
Genome-scale high-throughput sequencing enables the detection of unprecedented numbers of sequence variants. Variant filtering and interpretation are facilitated by mutation databases, in silico tools, and population-based reference datasets such as ExAC/gnomAD, while variants are classified using the ACMG/AMP guidelines. These methods, however, pose clinically relevant challenges. We queried the gnomAD dataset for (likely) pathogenic variants in genes causing autosomal-dominant disorders. Furthermore, focusing on the fibrillinopathies Marfan syndrome (MFS) and congenital contractural arachnodactyly (CCA), we screened 500 genomes of our patients for co-occurring variants in FBN1 and FBN2. In gnomAD, we detected 2653 (likely) pathogenic variants in 253 genes associated with autosomal-dominant disorders, enabling the estimation of variant-filtering thresholds and disease predisposition/prevalence rates. In our database, we discovered two families with hitherto unreported co-occurrence of FBN1/FBN2 variants causing phenotypes with mixed or modified MFS/CCA clinical features. We show that (likely) pathogenic gnomAD variants may be more frequent than expected and are challenging to classify according to the ACMG/AMP guidelines as well as that fibrillinopathies are likely underdiagnosed and may co-occur. Consequently, selection of appropriate frequency cutoffs, recognition of digenic variants, and variant classification represent considerable challenges in variant interpretation. Neglecting these challenges may lead to incomplete or missed diagnoses.
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Affiliation(s)
- Arash Najafi
- Center for Cardiovascular Genetics and Gene DiagnosticsFoundation for People with Rare DiseasesSchlieren‐ZurichSwitzerland
- Cantonal Hospital WinterthurInstitute of Radiology and Nuclear MedicineWinterthurSwitzerland
| | - Sylvan M. Caspar
- Center for Cardiovascular Genetics and Gene DiagnosticsFoundation for People with Rare DiseasesSchlieren‐ZurichSwitzerland
| | - Janine Meienberg
- Center for Cardiovascular Genetics and Gene DiagnosticsFoundation for People with Rare DiseasesSchlieren‐ZurichSwitzerland
| | - Marianne Rohrbach
- Division of Metabolism and Children's Research CenterUniversity Children's Hospital Zurich Eleonore FoundationZurichSwitzerland
| | - Beat Steinmann
- Division of Metabolism and Children's Research CenterUniversity Children's Hospital Zurich Eleonore FoundationZurichSwitzerland
| | - Gabor Matyas
- Center for Cardiovascular Genetics and Gene DiagnosticsFoundation for People with Rare DiseasesSchlieren‐ZurichSwitzerland
- Zurich Center for Integrative Human PhysiologyUniversity of ZurichZurichSwitzerland
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8
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de Boer M, van Leeuwen K, Hauri-Hohl M, Roos D. Activation of cryptic splice sites in three patients with chronic granulomatous disease. Mol Genet Genomic Med 2019; 7:e854. [PMID: 31364312 PMCID: PMC6732321 DOI: 10.1002/mgg3.854] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 05/24/2019] [Accepted: 06/05/2019] [Indexed: 01/07/2023] Open
Abstract
Background Chronic granulomatous disease (CGD) is a primary immune deficiency caused by mutations in the genes encoding the structural components of the phagocyte NADPH oxidase. As a result, the patients cannot generate sufficient amounts of reactive oxygen species required for killing pathogenic microorganisms. Methods We analyzed NADPH oxidase activity and component expression in neutrophils, performed genomic DNA and cDNA analysis, and used mRNA splicing prediction tools to evaluate the impact of mutations. Results In two patients with CGD, we had previously found mutations that cause aberrant pre‐mRNA splicing. In one patient an exonic mutation in a cryptic donor splice site caused the deletion of the 3' part of exon 6 from the mRNA of CYBB. This patient suffers from X‐linked CGD. The second patient, with autosomal CGD, has a mutation in the donor splice site of intron 1 of CYBA that activates a cryptic donor splice site downstream in intron 1, causing the insertion of intronic sequences in the mRNA. The third patient, recently analyzed, also with autosomal CGD, has a mutation in intron 4 of CYBA, 15 bp from the acceptor splice site. This mutation weakens a branch site and activates a cryptic acceptor splice site, causing the insertion of 14 intronic nucleotides into the mRNA. Conclusion We found three different mutations, one exonic, one in a donor splice site and one intronic, that all caused missplicing of pre‐mRNA. We analyzed these mutations with four different splice prediction programs and found that predictions of splice site strength, splice enhancer and splice silencer protein binding and branch site strength are all essential for correct prediction of pre‐mRNA splicing.
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Affiliation(s)
- Martin de Boer
- Sanquin Research and Landsteiner Laboratory, Amsterdam Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Karin van Leeuwen
- Sanquin Research and Landsteiner Laboratory, Amsterdam Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Mathias Hauri-Hohl
- Department of Stem Cell Transplantation Research, University Children's Hospital Zürich, Zürich, Switzerland
| | - Dirk Roos
- Sanquin Research and Landsteiner Laboratory, Amsterdam Medical Center, University of Amsterdam, Amsterdam, The Netherlands
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9
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Lord J, Gallone G, Short PJ, McRae JF, Ironfield H, Wynn EH, Gerety SS, He L, Kerr B, Johnson DS, McCann E, Kinning E, Flinter F, Temple IK, Clayton-Smith J, McEntagart M, Lynch SA, Joss S, Douzgou S, Dabir T, Clowes V, McConnell VPM, Lam W, Wright CF, FitzPatrick DR, Firth HV, Barrett JC, Hurles ME. Pathogenicity and selective constraint on variation near splice sites. Genome Res 2018; 29:159-170. [PMID: 30587507 PMCID: PMC6360807 DOI: 10.1101/gr.238444.118] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 12/20/2018] [Indexed: 12/29/2022]
Abstract
Mutations that perturb normal pre-mRNA splicing are significant contributors to human disease. We used exome sequencing data from 7833 probands with developmental disorders (DDs) and their unaffected parents, as well as more than 60,000 aggregated exomes from the Exome Aggregation Consortium, to investigate selection around the splice sites and quantify the contribution of splicing mutations to DDs. Patterns of purifying selection, a deficit of variants in highly constrained genes in healthy subjects, and excess de novo mutations in patients highlighted particular positions within and around the consensus splice site of greater functional relevance. By using mutational burden analyses in this large cohort of proband–parent trios, we could estimate in an unbiased manner the relative contributions of mutations at canonical dinucleotides (73%) and flanking noncanonical positions (27%), and calculate the positive predictive value of pathogenicity for different classes of mutations. We identified 18 patients with likely diagnostic de novo mutations in dominant DD-associated genes at noncanonical positions in splice sites. We estimate 35%–40% of pathogenic variants in noncanonical splice site positions are missing from public databases.
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Affiliation(s)
- Jenny Lord
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom
| | - Giuseppe Gallone
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom
| | - Patrick J Short
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom
| | - Jeremy F McRae
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom
| | - Holly Ironfield
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom
| | - Elizabeth H Wynn
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom
| | - Sebastian S Gerety
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom
| | - Liu He
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom
| | - Bronwyn Kerr
- Manchester Centre for Genomic Medicine, St. Mary's Hospital, Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Sciences Centre, Manchester M13 9WL, United Kingdom.,Division of Evolution and Genomic Sciences, School of Biological Sciences, University of Manchester, Manchester M13 9NT, United Kingdom
| | - Diana S Johnson
- Sheffield Clinical Genetics Service, Sheffield Children's Hospital, OPD2, Northern General Hospital, Sheffield S5 7AU, United Kingdom
| | - Emma McCann
- Liverpool Women's Hospital Foundation Trust, Liverpool L8 7SS, United Kingdom
| | - Esther Kinning
- West of Scotland Regional Genetics Service, NHS Greater Glasgow and Clyde, Institute of Medical Genetics, Yorkhill Hospital, Glasgow G3 8SJ, United Kingdom
| | - Frances Flinter
- South East Thames Regional Genetics Centre, Guy's and St Thomas' NHS Foundation Trust, Guy's Hospital, London SE1 9RT, United Kingdom
| | - I Karen Temple
- Faculty of Medicine, University of Southampton, Institute of Developmental Sciences, Southampton SO16 6YD, United Kingdom.,Wessex Clinical Genetics Service, University Hospital Southampton, Princess Anne Hospital, Southampton SO16 5YA, United Kingdom
| | - Jill Clayton-Smith
- Manchester Centre for Genomic Medicine, St. Mary's Hospital, Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Sciences Centre, Manchester M13 9WL, United Kingdom.,Division of Evolution and Genomic Sciences, School of Biological Sciences, University of Manchester, Manchester M13 9NT, United Kingdom
| | - Meriel McEntagart
- South West Thames Regional Genetics Centre, St. George's Healthcare NHS Trust, St. George's, University of London, London SW17 0RE, United Kingdom
| | | | - Shelagh Joss
- West of Scotland Regional Genetics Service, NHS Greater Glasgow and Clyde, Queen Elizabeth University Hospital, Glasgow G51 4TF, United Kingdom
| | - Sofia Douzgou
- Manchester Centre for Genomic Medicine, St. Mary's Hospital, Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Sciences Centre, Manchester M13 9WL, United Kingdom.,Division of Evolution and Genomic Sciences, School of Biological Sciences, University of Manchester, Manchester M13 9NT, United Kingdom
| | - Tabib Dabir
- Northern Ireland Regional Genetics Centre, Belfast Health and Social Care Trust, Belfast City Hospital, Belfast BT9 7AB, United Kingom
| | - Virginia Clowes
- North West Thames Regional Genetics Service, London North West University Healthcare NHS Trust, Northwick Park and St. Mark's Hospitals, Harrow HA1 3UJ, United Kingdom
| | - Vivienne P M McConnell
- Northern Ireland Regional Genetics Centre, Belfast Health and Social Care Trust, Belfast City Hospital, Belfast BT9 7AB, United Kingom
| | - Wayne Lam
- MRC Human Genetics Unit, MRC IGMM, University of Edinburgh, Western General Hospital, Edinburgh EH4 2XU, United Kingdom
| | - Caroline F Wright
- Institute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter EX2 5DW, United Kingdom
| | - David R FitzPatrick
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom.,MRC Human Genetics Unit, MRC IGMM, University of Edinburgh, Western General Hospital, Edinburgh EH4 2XU, United Kingdom
| | - Helen V Firth
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom.,East Anglian Medical Genetics Service, Cambridge University Hospitals NHS Foundation Trust, Cambridge CB2 0QQ, United Kingdom
| | - Jeffrey C Barrett
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom
| | - Matthew E Hurles
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom
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10
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Morris H, Navarre P. Bilateral Congenital Vertical Talus in Association with Beals Contractural Arachnodactyly: A Case Report. JBJS Case Connect 2018; 8:e97. [PMID: 30540606 DOI: 10.2106/jbjs.cc.18.00107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
CASE Congenital vertical talus (CVT) is a rare rigid flatfoot disorder with a rocker-bottom flatfoot appearance. It is characterized by hindfoot valgus and equinus, with associated midfoot dorsiflexion and forefoot abduction. We describe a patient who was born with dysmorphic features and subsequently was diagnosed with Beals contractural arachnodactyly. After the diagnosis of bilateral CVT was made, it was treated with a single-stage open reduction. There was a unilateral recurrence, which was treated with revision surgery. The patient had an excellent functional outcome. CONCLUSION CVT often requires surgical management and may recur. To our knowledge, this is the first reported case of CVT associated with Beals contractural arachnodactyly.
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Affiliation(s)
- Holly Morris
- Leicester Medical School, University of Leicester, Leicester, United Kingdom
| | - Pierre Navarre
- Southland Hospital/University of Otago, Invercargill, New Zealand
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11
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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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12
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Zhang Q, Fan X, Wang Y, Sun MA, Shao J, Guo D. BPP: a sequence-based algorithm for branch point prediction. Bioinformatics 2018. [PMID: 28633445 DOI: 10.1093/bioinformatics/btx401] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Motivation Although high-throughput sequencing methods have been proposed to identify splicing branch points in the human genome, these methods can only detect a small fraction of the branch points subject to the sequencing depth, experimental cost and the expression level of the mRNA. An accurate computational model for branch point prediction is therefore an ongoing objective in human genome research. Results We here propose a novel branch point prediction algorithm that utilizes information on the branch point sequence and the polypyrimidine tract. Using experimentally validated data, we demonstrate that our proposed method outperforms existing methods. Availability and implementation: https://github.com/zhqingit/BPP. Contact djguo@cuhk.edu.hk. Supplementary information Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- Qing Zhang
- School of Life Sciences and the State Key Laboratory of Agrobiotechnology
| | - Xiaodan Fan
- Department of Statistics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, China
| | - Yejun Wang
- Department of Cell Biology and Genetics, Shenzhen University Health Science Center, Shenzhen 518060, China
| | - Ming-An Sun
- School of Life Sciences and the State Key Laboratory of Agrobiotechnology
| | - Jianlin Shao
- First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Dianjing Guo
- School of Life Sciences and the State Key Laboratory of Agrobiotechnology
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13
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Bose D, D V, Shetty M, J K, Kutty AVM. Identification of intronic-splice site mutations in GATA4 gene in Indian patients with congenital heart disease. Mutat Res 2017; 803-805:26-34. [PMID: 28843068 DOI: 10.1016/j.mrfmmm.2017.08.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 07/01/2017] [Accepted: 08/08/2017] [Indexed: 12/19/2022]
Abstract
Congenital Heart Disease (CHD) is the most common birth defect among congenital anomalies that arise before birth. GATA4 transcription factor plays an important role in foetal heart development. Mutational analysis of GATA4 gene in CHD patients revealed five known heterozygous mutations (p.T355S, p.S377G, p.V380M, p.P394T and p.D425N) identified in exons 5 and 6 regions and fifteen intronic variants in the non-coding regions (g.76885T>C/Y,g.76937G>S, g.78343G>R, g.83073T>Y, g.83271C>A/M, g.83318G>K, g.83415G>R, g.83502A>C/M, g.84991G>R, g.85294C>Y, g.85342C>T/Y, g.86268A>R, g.87409G>A/R, g.87725T>Y, g.87813A>T/W). In silico analysis of these intronic variants identified two potential branch point mutations (g.83271C>A/M, g.86268A>R) and predicted effects of these on intronic splice sites as enhancer and silencer motifs. This study attempts to correlate the pattern of intronic variants of GATA4 gene which might provide new insights to unravel the possible molecular etiology of CHD.
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Affiliation(s)
- Divya Bose
- Division of Genomics, Department of Cell Biology and Molecular Genetics, Sri Devaraj Urs Academy of Higher Education and Research, Tamaka, Kolar, Karnataka, India
| | - Vaigundan D
- Division of Genomics, Department of Cell Biology and Molecular Genetics, Sri Devaraj Urs Academy of Higher Education and Research, Tamaka, Kolar, Karnataka, India
| | - Mitesh Shetty
- Division of Genomics, Department of Cell Biology and Molecular Genetics, Sri Devaraj Urs Academy of Higher Education and Research, Tamaka, Kolar, Karnataka, India
| | - Krishnappa J
- Department of Pediatrics, Sri Devaraj Urs Medical College, R. L. Jalappa Hospital and Research Centre, Tamaka, Kolar, Karnataka, India
| | - A V M Kutty
- Division of Genomics, Department of Cell Biology and Molecular Genetics, Sri Devaraj Urs Academy of Higher Education and Research, Tamaka, Kolar, Karnataka, India.
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14
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Ipe J, Swart M, Burgess KS, Skaar TC. High-Throughput Assays to Assess the Functional Impact of Genetic Variants: A Road Towards Genomic-Driven Medicine. Clin Transl Sci 2017; 10:67-77. [PMID: 28213901 PMCID: PMC5355973 DOI: 10.1111/cts.12440] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 01/03/2017] [Indexed: 01/08/2023] Open
Affiliation(s)
- J Ipe
- Indiana University School of MedicineDepartment of MedicineDivision of Clinical PharmacologyIndianapolisIndianaUSA
| | - M Swart
- Indiana University School of MedicineDepartment of MedicineDivision of Clinical PharmacologyIndianapolisIndianaUSA
| | - KS Burgess
- Indiana University School of MedicineDepartment of MedicineDivision of Clinical PharmacologyIndianapolisIndianaUSA
- Indiana University School of MedicineDepartment of Pharmacology and ToxicologyIndianapolisIndianaUSA
| | - TC Skaar
- Indiana University School of MedicineDepartment of MedicineDivision of Clinical PharmacologyIndianapolisIndianaUSA
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15
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Deng H, Lu Q, Xu H, Deng X, Yuan L, Yang Z, Guo Y, Lin Q, Xiao J, Guan L, Song Z. Identification of a Novel Missense FBN2 Mutation in a Chinese Family with Congenital Contractural Arachnodactyly Using Exome Sequencing. PLoS One 2016; 11:e0155908. [PMID: 27196565 PMCID: PMC4873217 DOI: 10.1371/journal.pone.0155908] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 05/08/2016] [Indexed: 11/18/2022] Open
Abstract
Congenital contractural arachnodactyly (CCA, OMIM 121050), also known as Beals-Hecht syndrome, is an autosomal dominant disorder of connective tissue. CCA is characterized by arachnodactyly, dolichostenomelia, pectus deformities, kyphoscoliosis, congenital contractures and a crumpled appearance of the helix of the ear. The aim of this study is to identify the genetic cause of a 4-generation Chinese family of Tujia ethnicity with congenital contractural arachnodactyly by exome sequencing. The clinical features of patients in this family are consistent with CCA. A novel missense mutation, c.3769T>C (p.C1257R), in the fibrillin 2 gene (FBN2) was identified responsible for the genetic cause of our family with CCA. The p.C1257R mutation occurs in the 19th calcium-binding epidermal growth factor-like (cbEGF) domain. The amino acid residue cysteine in this domain is conserved among different species. Our findings suggest that exome sequencing is a powerful tool to discover mutation(s) in CCA. Our results may also provide new insights into the cause and diagnosis of CCA, and may have implications for genetic counseling and clinical management.
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Affiliation(s)
- Hao Deng
- Department of Neurology, the Third Xiangya Hospital, Central South University, Changsha, 410013, China
- Center for Experimental Medicine, the Third Xiangya Hospital, Central South University, Changsha, 410013, China
- * E-mail: (HD); (ZS)
| | - Qian Lu
- Center for Experimental Medicine, the Third Xiangya Hospital, Central South University, Changsha, 410013, China
| | - Hongbo Xu
- Center for Experimental Medicine, the Third Xiangya Hospital, Central South University, Changsha, 410013, China
| | - Xiong Deng
- Center for Experimental Medicine, the Third Xiangya Hospital, Central South University, Changsha, 410013, China
| | - Lamei Yuan
- Center for Experimental Medicine, the Third Xiangya Hospital, Central South University, Changsha, 410013, China
| | - Zhijian Yang
- Center for Experimental Medicine, the Third Xiangya Hospital, Central South University, Changsha, 410013, China
| | - Yi Guo
- Center for Experimental Medicine, the Third Xiangya Hospital, Central South University, Changsha, 410013, China
- Department of Medical Information, Information Security and Big Data Research Institute, Central South University, Changsha, 410013, China
| | | | | | | | - Zhi Song
- Department of Neurology, the Third Xiangya Hospital, Central South University, Changsha, 410013, China
- * E-mail: (HD); (ZS)
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16
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Concomitant partial exon skipping by a unique missense mutation of RPS6KA3 causes Coffin-Lowry syndrome. Gene 2015; 575:42-7. [PMID: 26297997 DOI: 10.1016/j.gene.2015.08.032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 07/03/2015] [Accepted: 08/17/2015] [Indexed: 10/23/2022]
Abstract
Coffin-Lowry syndrome (CLS) is an X-linked semi-dominant disorder characterized by diverse phenotypes including intellectual disability, facial and digital anomalies. Loss-of-function mutations in the Ribosomal Protein S6 Kinase Polypeptide 3 (RPS6KA3) gene have been shown to be responsible for CLS. Among the large number of mutations, however, no exonic mutation causing exon skipping has been described. Here, we report a male patient with CLS having a novel mutation at the 3' end of an exon at a splice donor junction. Interestingly, this nucleotide change causes both a novel missense mutation and partial exon skipping leading to a truncated transcript. These two transcripts were identified by cDNA sequencing of RT-PCR products. In the carrier mother, we found only wildtype transcripts suggesting skewed X-inactivation. Methylation studies confirmed X-inactivation was skewed moderately, but not completely, which is consistent with her mild phenotype. Western blot showed that the mutant RSK2 protein in the patient is expressed at similar levels relative to his mother. Protein modeling demonstrated that the missense mutation is damaging and may alter binding to ATP molecules. This is the first report of exon skipping from an exonic mutation of RPS6KA3, demonstrating that a missense mutation and concomitant disruption of normal splicing contribute to the manifestation of CLS.
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17
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Takeda N, Morita H, Fujita D, Inuzuka R, Taniguchi Y, Imai Y, Hirata Y, Komuro I. Congenital contractural arachnodactyly complicated with aortic dilatation and dissection: Case report and review of literature. Am J Med Genet A 2015; 167A:2382-7. [DOI: 10.1002/ajmg.a.37162] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Accepted: 04/29/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Norifumi Takeda
- Department of Cardiovascular Medicine; The University of Tokyo Hospital; Bunkyo-ku Tokyo Japan
| | - Hiroyuki Morita
- Department of Cardiovascular Medicine; The University of Tokyo Hospital; Bunkyo-ku Tokyo Japan
- Department of Translational Research for Healthcare and Clinical Science; The University of Tokyo Hospital; Bunkyo-ku Tokyo Japan
| | - Daishi Fujita
- Department of Cardiovascular Medicine; The University of Tokyo Hospital; Bunkyo-ku Tokyo Japan
| | - Ryo Inuzuka
- Department of Pediatrics; The University of Tokyo Hospital; Bunkyo-ku Tokyo Japan
| | - Yuki Taniguchi
- Department of Orthopedic Surgery; The University of Tokyo Hospital; Bunkyo-ku Tokyo Japan
| | - Yasushi Imai
- Division of Cardiovascular Medicine; Jichi Medical University; Shimotsuke Tochigi Japan
| | | | - Issei Komuro
- Department of Cardiovascular Medicine; The University of Tokyo Hospital; Bunkyo-ku Tokyo Japan
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18
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RNA-Binding Proteins: Splicing Factors and Disease. Biomolecules 2015; 5:893-909. [PMID: 25985083 PMCID: PMC4496701 DOI: 10.3390/biom5020893] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 04/22/2015] [Accepted: 04/29/2015] [Indexed: 12/12/2022] Open
Abstract
Pre-mRNA splicing is mediated by interactions of the Core Spliceosome and an array of accessory RNA binding proteins with cis-sequence elements. Splicing is a major regulatory component in higher eukaryotes. Disruptions in splicing are a major contributor to human disease. One in three hereditary disease alleles are believed to cause aberrant splicing. Hereditary disease alleles can alter splicing by disrupting a splicing element, creating a toxic RNA, or affecting splicing factors. One of the challenges of medical genetics is identifying causal variants from the thousands of possibilities discovered in a clinical sequencing experiment. Here we review the basic biochemistry of splicing, the mechanisms of splicing mutations, the methods for identifying splicing mutants, and the potential of therapeutic interventions.
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19
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Liu W, Zhao N, Li XF, Wang H, Sui Y, Lu YP, Feng WH, Ma C, Han WT, Jiang M. A novel FBN2 mutation in a Chinese family with congenital contractural arachnodactyly. FEBS Open Bio 2015; 5:163-6. [PMID: 25834781 PMCID: PMC4359973 DOI: 10.1016/j.fob.2015.02.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 02/25/2015] [Accepted: 02/27/2015] [Indexed: 11/30/2022] Open
Abstract
We identified a novel FBN2 mutation (C1406R) in a Chinese family with CCA. The mutation presented in the patients of this family but not in unaffected members. SIFT and PolyPhen analyses suggested that the mutation was pathogenic. The mutation was located in the calcium-binding epidermal growth factor-like domain.
Congenital contractural arachnodactyly (CCA, OMIM: 121050) is an autosomal dominant condition that shares skeletal features with Marfan syndrome (MFS, OMIM: 154700), including contractures, arachnodactyly, dolichostenomelia, scoliosis, crumpled ears and pectus deformities but excluding the ocular and cardiovascular complications that characterize MFS. These two similar syndromes result from mutations in two genes belonging to the fibrillin family, FBN1 and FBN2, respectively. We successfully identified a novel FBN2 mutation (C1406R) in a Chinese family with CCA for over five generations. This mutation was detected in the patients of this family but not in the seven unaffected family members or 100 normal individuals. SIFT and PolyPhen analyses suggested that the mutation was pathogenic. We identified a missense mutation in the calcium binding-epidermal growth factor (cbEGF)-like domain. Our study extends the mutation spectrum of CCA and confirms a relationship between mutations in the FBN2 gene and the clinical findings of CCA.
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Affiliation(s)
- Wei Liu
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, China
| | - Ning Zhao
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, China
| | - Xue-Fu Li
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, China
| | - Hong Wang
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, China
| | - Yu Sui
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, China
| | - Yong-Ping Lu
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, China
| | - Wen-Hua Feng
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, China
| | - Chao Ma
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, China
| | - Wei-Tian Han
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, China
| | - Miao Jiang
- Key Laboratory of Reproductive Health and Medical Genetics, National Health and Family Planning Commission, China
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20
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Soemedi R, Vega H, Belmont JM, Ramachandran S, Fairbrother WG. Genetic variation and RNA binding proteins: tools and techniques to detect functional polymorphisms. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 825:227-66. [PMID: 25201108 DOI: 10.1007/978-1-4939-1221-6_7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
At its most fundamental level the goal of genetics is to connect genotype to phenotype. This question is asked at a basic level evaluating the role of genes and pathways in genetic model organism. Increasingly, this question is being asked in the clinic. Genomes of individuals and populations are being sequenced and compared. The challenge often comes at the stage of analysis. The variant positions are analyzed with the hope of understanding human disease. However after a genome or exome has been sequenced, the researcher is often deluged with hundreds of potentially relevant variations. Traditionally, amino-acid changing mutations were considered the tractable class of disease-causing mutations; however, mutations that disrupt noncoding elements are the subject of growing interest. These noncoding changes are a major avenue of disease (e.g., one in three hereditary disease alleles are predicted to affect splicing). Here, we review some current practices of medical genetics, the basic theory behind biochemical binding and functional assays, and then explore technical advances in how variations that alter RNA protein recognition events are detected and studied. These advances are advances in scale-high-throughput implementations of traditional biochemical assays that are feasible to perform in any molecular biology laboratory. This chapter utilizes a case study approach to illustrate some methods for analyzing polymorphisms. The first characterizes a functional intronic SNP that deletes a high affinity PTB site using traditional low-throughput biochemical and functional assays. From here we demonstrate the utility of high-throughput splicing and spliceosome assembly assays for screening large sets of SNPs and disease alleles for allelic differences in gene expression. Finally we perform three pilot drug screens with small molecules (G418, tetracycline, and valproic acid) that illustrate how compounds that rescue specific instances of differential pre-mRNA processing can be discovered.
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Affiliation(s)
- Rachel Soemedi
- Center for Computational Molecular Biology, Brown University, Providence, RI, USA
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21
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Inbar-Feigenberg M, Meirowitz N, Nanda D, Toi A, Okun N, Chitayat D. Beals syndrome (congenital contractural arachnodactyly): prenatal ultrasound findings and molecular analysis. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2014; 44:486-490. [PMID: 24585410 DOI: 10.1002/uog.13350] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 01/24/2014] [Accepted: 02/11/2014] [Indexed: 06/03/2023]
Abstract
We report the prenatal findings in two cases of Beals syndrome. Both pregnancies presented with clinical features of arthrogryposis multiplex congenita/fetal akinesia syndrome (AMC/FAS), including clenched fists and multiple joint contractures on repeat prenatal ultrasound examinations. The first case was diagnosed as having Beals syndrome on physical examination shortly after birth and the diagnosis was confirmed by DNA analysis, shown as a point mutation in the fibrillin 2 (FBN2) gene. The second case was diagnosed with Beals syndrome following microarray analysis on amniocytes, which showed a deletion of the FBN2 gene. Although most cases with AMC/FAS carry a poor prognosis, Beals syndrome is consistent with normal cognitive development and a better prognosis. Thus, making the correct diagnosis is crucial, both pre- and postnatally, for accurate counseling and management.
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Affiliation(s)
- M Inbar-Feigenberg
- Division of Clinical and Metabolic Genetics, Department of Pediatrics, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
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22
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Lewandowska MA. The missing puzzle piece: splicing mutations. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2013; 6:2675-2682. [PMID: 24294354 PMCID: PMC3843248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 10/31/2013] [Indexed: 06/02/2023]
Abstract
Proper gene splicing is highly dependent on the correct recognition of exons. Among the elements allowing this process are the "cis" (conserved sequences) and "trans" (snRNP, splicing factors) elements. Splicing mutations are related with a number of genetic disorders and usually induce exon skipping, form new exon/intron boundaries or activate new cryptic exons as a result of alterations at donor/acceptor sites. They constitute more than 9% of the currently published mutations, but this value is highly underestimated as many of the potential mutations are located in the "cis" elements and should be confirmed experimentally. The most commonly detected splicing mutations are located at donor (5') and acceptor (3') sites. Mutations at the branch point are rare (only over a dozen are known to date), and are mostly searched and detected when no alteration has been detected in the sequenced exons and UTRs. Polypyrimidine tract mutations are equally rare. High throughput technologies, as well as traditional Sanger sequencing, allow detection of many changes in intronic sequences and intron/exon boundaries. However, the assessment whether a mutation affects exon recognition and results in a genetic disorder has to be conducted using molecular biology methods: in vitro transcription of the sequence of interest cloned into a plasmid, with and without alterations, or mutation analysis via a hybrid minigene system. Even though microarrays and new generation sequencing methods pose difficulties in detecting novel branch point mutations, these tools seem appropriate to expand the mutation detection panel especially for diagnostic purposes.
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Affiliation(s)
- Marzena A Lewandowska
- Molecular Oncology and Genetics Unit, Department of Tumor Pathology and Pathomorphology, The Franciszek Lukaszczyk Oncology Center Dr I. Romanowskiej 2, 85-796, Bydgoszcz, Poland ; Department of Thoracic Surgery and Tumors, Ludwik Rydygier Collegium Medicum, Bydgoszcz, Nicolaus, Copernicus University Torun, Poland
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23
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Shi Y, Tu Y, Mecham RP, Bassnett S. Ocular phenotype of Fbn2-null mice. Invest Ophthalmol Vis Sci 2013; 54:7163-73. [PMID: 24130178 DOI: 10.1167/iovs.13-12687] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE Fibrillin-2 (Fbn2) is the dominant fibrillin isoform expressed during development of the mouse eye. To test its role in morphogenesis, we examined the ocular phenotype of Fbn2(-/-) mice. METHODS Ocular morphology was assessed by confocal microscopy using antibodies against microfibril components. RESULTS Fbn2(-/-) mice had a high incidence of anterior segment dysgenesis. The iris was the most commonly affected tissue. Complete iridal coloboma was present in 37% of eyes. Dyscoria, corectopia and pseudopolycoria were also common (43% combined incidence). In wild-type (WT) mice, fibrillin-2-rich microfibrils are prominent in the pupillary membrane (PM) during development. In Fbn2-null mice, the absence of Fbn2 was partially compensated for by increased expression of fibrillin-1, although the resulting PM microfibrils were disorganized, compared with WTs. In colobomatous adult Fbn2(-/-) eyes, the PM failed to regress normally, especially beneath the notched region of the iris. Segments of the ciliary body were hypoplastic, and zonular fibers, although relatively plentiful, were unevenly distributed around the lens equator. In regions where the zonular fibers were particularly disturbed, the synchronous differentiation of the underlying lens fiber cells was affected. CONCLUSIONS Fbn2 has an indispensable role in ocular morphogenesis in mice. The high incidence of iris coloboma in Fbn2-null animals implies a previously unsuspected role in optic fissure closure. The observation that fiber cell differentiation was disturbed in Fbn2(-/-) mice raises the possibility that the attachment of zonular fibers to the lens surface may help specify the equatorial margin of the lens epithelium.
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Affiliation(s)
- Yanrong Shi
- Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, Missouri
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24
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Chen Y, Lei YP, Zheng HX, Wang W, Cheng HB, Zhang J, Wang HY, Jin L, Li H. A Novel Mutation (C1425Y) in the FBN2 Gene in a Father and Son with Congenital Contractural Arachnodactyly. Genet Test Mol Biomarkers 2009; 13:295-300. [PMID: 19473076 DOI: 10.1089/gtmb.2008.0132] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Ying Chen
- Center for Reproduction and Genetics, Nanjing Medical University Affiliated Suzhou Hospital, Suzhou, P.R. China
| | - Yun-Ping Lei
- State Key Laboratory of Genetic Engineering and MOE Key Laboratory of Contemporary Anthropology, School of Life Sciences and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Hong-Xiang Zheng
- State Key Laboratory of Genetic Engineering and MOE Key Laboratory of Contemporary Anthropology, School of Life Sciences and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Wei Wang
- Center for Reproduction and Genetics, Nanjing Medical University Affiliated Suzhou Hospital, Suzhou, P.R. China
| | - Hong-Bo Cheng
- Center for Reproduction and Genetics, Nanjing Medical University Affiliated Suzhou Hospital, Suzhou, P.R. China
| | - Jing Zhang
- Center for Reproduction and Genetics, Nanjing Medical University Affiliated Suzhou Hospital, Suzhou, P.R. China
| | - Hong-Yan Wang
- State Key Laboratory of Genetic Engineering and MOE Key Laboratory of Contemporary Anthropology, School of Life Sciences and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Li Jin
- State Key Laboratory of Genetic Engineering and MOE Key Laboratory of Contemporary Anthropology, School of Life Sciences and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Hong Li
- Center for Reproduction and Genetics, Nanjing Medical University Affiliated Suzhou Hospital, Suzhou, P.R. China
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25
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Callewaert BL, Loeys BL, Ficcadenti A, Vermeer S, Landgren M, Kroes HY, Yaron Y, Pope M, Foulds N, Boute O, Galán F, Kingston H, Van der Aa N, Salcedo I, Swinkels ME, Wallgren-Pettersson C, Gabrielli O, De Backer J, Coucke PJ, De Paepe AM. Comprehensive clinical and molecular assessment of 32 probands with congenital contractural arachnodactyly: report of 14 novel mutations and review of the literature. Hum Mutat 2009; 30:334-41. [PMID: 19006240 DOI: 10.1002/humu.20854] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Beals-Hecht syndrome or congenital contractural arachnodactyly (CCA) is a rare, autosomal dominant connective tissue disorder characterized by crumpled ears, arachnodactyly, contractures, and scoliosis. Recent reports also mention aortic root dilatation, a finding previously thought to differentiate the condition from Marfan syndrome (MFS). In many cases, the condition is caused by mutations in the fibrillin 2 gene (FBN2) with 26 mutations reported so far, all located in the middle region of the gene (exons 23-34). We directly sequenced the entire FBN2 gene in 32 probands clinically diagnosed with CCA. In 14 probands, we found 13 new and one previously described FBN2 mutation including a mutation in exon 17, expanding the region in which FBN2 mutations occur in CCA. Review of the literature showed that the phenotype of the FBN2 positive patients was comparable to all previously published FBN2-positive patients. In our FBN2-positive patients, cardiovascular involvement included mitral valve prolapse in two adult patients and aortic root enlargement in three patients. Whereas the dilatation regressed in one proband, it remained marked in a child proband (z-score: 4.09) and his father (z-score: 2.94), warranting echocardiographic follow-up. We confirm paradoxical patellar laxity and report keratoconus, shoulder muscle hypoplasia, and pyeloureteral junction stenosis as new features. In addition, we illustrate large intrafamilial variability. Finally, the FBN2-negative patients in this cohort were clinically indistinguishable from all published FBN2-positive patients harboring a FBN2 mutation, suggesting locus heterogeneity.
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26
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Frédéric MY, Monino C, Marschall C, Hamroun D, Faivre L, Jondeau G, Klein HG, Neumann L, Gautier E, Binquet C, Maslen C, Godfrey M, Gupta P, Milewicz D, Boileau C, Claustres M, Béroud C, Collod-Béroud G. The FBN2 gene: new mutations, locus-specific database (Universal Mutation Database FBN2), and genotype-phenotype correlations. Hum Mutat 2009; 30:181-90. [PMID: 18767143 DOI: 10.1002/humu.20794] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Congenital contractural arachnodactyly (CCA) is an extremely rare disease, due to mutations in the FBN2 gene encoding fibrillin-2. Another member of the fibrillin family, the FBN1 gene, is involved in a broad phenotypic continuum of connective-tissue disorders including Marfan syndrome. Identifying not only what is in common but also what differentiates these two proteins should enable us to better comprehend their respective functions and better understand the multitude of diseases in which these two genes are involved. In 1995 we created a locus-specific database (LSDB) for FBN1 mutations with the Universal Mutation Database (UMD) tool. To facilitate comparison of identified mutations in these two genes and search for specific functional areas, we created an LSDB for the FBN2 gene: the UMD-FBN2 database. This database lists 26 published and six newly identified mutations that mainly comprise missense and splice-site mutations. Although the number of described FBN2 mutations was low, the frequency of joint dislocation was significantly higher with missense mutations when compared to splice site mutations.
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27
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Desmet FO, Hamroun D, Lalande M, Collod-Béroud G, Claustres M, Béroud C. Human Splicing Finder: an online bioinformatics tool to predict splicing signals. Nucleic Acids Res 2009; 37:e67. [PMID: 19339519 PMCID: PMC2685110 DOI: 10.1093/nar/gkp215] [Citation(s) in RCA: 1992] [Impact Index Per Article: 132.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Thousands of mutations are identified yearly. Although many directly affect protein expression, an increasing proportion of mutations is now believed to influence mRNA splicing. They mostly affect existing splice sites, but synonymous, non-synonymous or nonsense mutations can also create or disrupt splice sites or auxiliary cis-splicing sequences. To facilitate the analysis of the different mutations, we designed Human Splicing Finder (HSF), a tool to predict the effects of mutations on splicing signals or to identify splicing motifs in any human sequence. It contains all available matrices for auxiliary sequence prediction as well as new ones for binding sites of the 9G8 and Tra2-β Serine-Arginine proteins and the hnRNP A1 ribonucleoprotein. We also developed new Position Weight Matrices to assess the strength of 5′ and 3′ splice sites and branch points. We evaluated HSF efficiency using a set of 83 intronic and 35 exonic mutations known to result in splicing defects. We showed that the mutation effect was correctly predicted in almost all cases. HSF could thus represent a valuable resource for research, diagnostic and therapeutic (e.g. therapeutic exon skipping) purposes as well as for global studies, such as the GEN2PHEN European Project or the Human Variome Project.
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28
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Wang H, Hou Y, Cui Y, Huang Y, Shi Y, Xia X, Lu H, Wang Y, Li X. A novel splice site mutation in the dentin sialophosphoprotein gene in a Chinese family with dentinogenesis imperfecta type II. Mutat Res 2009; 662:22-27. [PMID: 19103209 DOI: 10.1016/j.mrfmmm.2008.11.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2008] [Revised: 11/10/2008] [Accepted: 11/24/2008] [Indexed: 05/27/2023]
Abstract
Twenty-four individuals were investigated that spanned six generations in a Chinese family affected with an apparently autosomal dominant form of dentinogenesis imperfecta type II (DGI-II, OMIM #125490). All affected individuals presented with typical, clinical and radiographic features of DGI-II, but without bilateral progressive high-frequency sensorineural hearing loss. To investigate the mutated molecule, a positional candidate approach was used to determine the mutated gene in this family. Genomic DNA was obtained from 24 affected individuals, 18 unaffected relatives of the family and 50 controls. Haplotype analysis was performed using leukocyte DNA for 6 short tandem repeat (STR) markers present in chromosome 4 (D4S1534, GATA62A11, DSPP, DMP1, SPP1 and D4S1563). In the critical region between D4S1534 and DMP1, the dentin sialophosphoprotein (DSPP) gene (OMIM *125485) was considered as the strongest candidate gene. The first four exons and exon/intron boundaries of the gene were analyzed using DNA from 24 affected individuals and 18 unaffected relatives of the same family. DNA sequencing revealed a heterozygous deletion mutation in intron 2 (at positions -3 to -25), which resulted in a frameshift mutation, that changed the acceptor site sequence from CAG to AAG (IVS2-3C-->A) and may also have disrupted the branch point consensus sequence in intron 2. The mutation was found in the 24 affected individuals, but not in the 18 unaffected relatives and 50 controls. The deletion was identified by allele-specific sequencing and denaturing high-performance liquid chromatography (DHPLC) analysis. We conclude that the heterozygous deletion mutation contributed to the pathogenesis of DGI-II.
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Affiliation(s)
- HaoYang Wang
- Institute of Laboratory Medicine, Jinling Hospital, School of Medicine, Nanjing University, Nanjing 210002, PR China
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29
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Gao K, Masuda A, Matsuura T, Ohno K. Human branch point consensus sequence is yUnAy. Nucleic Acids Res 2008; 36:2257-67. [PMID: 18285363 PMCID: PMC2367711 DOI: 10.1093/nar/gkn073] [Citation(s) in RCA: 179] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2007] [Revised: 01/17/2008] [Accepted: 02/05/2008] [Indexed: 11/18/2022] Open
Abstract
Yeast carries a strictly conserved branch point sequence (BPS) of UACUAAC, whereas the human BPS is degenerative and is less well characterized. The human consensus BPS has never been extensively explored in vitro to date. Here, we sequenced 367 clones of lariat RT-PCR products arising from 52 introns of 20 human housekeeping genes. Among the 367 clones, a misincorporated nucleotide at the branch point was observed in 181 clones, for which we can precisely pinpoint the branch point. The branch points were comprised of 92.3% A, 3.3% C, 1.7% G and 2.8% U. Our analysis revealed that the human consensus BPS is simply yUnAy, where the underlined is the branch point at position zero and the lowercase pyrimidines ('y') are not as well conserved as the uppercase U and A. We found that the branch points are located 21-34 nucleotides upstream of the 3' end of an intron in 83% clones. We also found that the polypyrimidine tract spans 4-24 nucleotides downstream of the branch point. Our analysis demonstrates that the human BPSs are more degenerative than we have expected and that the human BPSs are likely to be recognized in combination with the polypyrimidine tract and/or the other splicing cis-elements.
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Affiliation(s)
| | | | | | - Kinji Ohno
- Division of Neurogenetics, Center for Neurological Diseases and Cancer, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan
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30
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Nishimura A, Sakai H, Ikegawa S, Kitoh H, Haga N, Ishikiriyama S, Nagai T, Takada F, Ohata T, Tanaka F, Kamasaki H, Saitsu H, Mizuguchi T, Matsumoto N. FBN2, FBN1, TGFBR1, and TGFBR2 analyses in congenital contractural arachnodactyly. Am J Med Genet A 2007; 143A:694-8. [PMID: 17345643 DOI: 10.1002/ajmg.a.31639] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
FBN2, FBN1, TGFBR1, and TGFBR2 were analyzed by direct sequencing in 15 probands with suspected congenital contractural arachnodactyly (CCA). A total of four novel FBN2 mutations were found in four probands (27%, 4/15), but remaining the 11 did not show any abnormality in either of the genes. This study indicated that FBN2 mutations were major abnormality in CCA, and TGFBR and FBN1 defects may not be responsible for the disorder. FBN2 mutations were only found at introns 30, 31, and 35 in this study. Thus analysis of a mutational hotspot from exons 22 to 36 (a middle part) of FBN2 should be prioritized in CCA as previously suggested.
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Affiliation(s)
- Akira Nishimura
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
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31
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Maslen CL, Babcock D, Robinson SW, Bean LJH, Dooley KJ, Willour VL, Sherman SL. CRELD1 mutations contribute to the occurrence of cardiac atrioventricular septal defects in Down syndrome. Am J Med Genet A 2007; 140:2501-5. [PMID: 17036335 DOI: 10.1002/ajmg.a.31494] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Cheryl L Maslen
- Department of Medicine, Division of Endocrinology, Oregon Health & Science University, Portland 97239, USA.
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32
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Robinson PN, Arteaga-Solis E, Baldock C, Collod-Béroud G, Booms P, De Paepe A, Dietz HC, Guo G, Handford PA, Judge DP, Kielty CM, Loeys B, Milewicz DM, Ney A, Ramirez F, Reinhardt DP, Tiedemann K, Whiteman P, Godfrey M. The molecular genetics of Marfan syndrome and related disorders. J Med Genet 2006; 43:769-87. [PMID: 16571647 PMCID: PMC2563177 DOI: 10.1136/jmg.2005.039669] [Citation(s) in RCA: 276] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Marfan syndrome (MFS), a relatively common autosomal dominant hereditary disorder of connective tissue with prominent manifestations in the skeletal, ocular, and cardiovascular systems, is caused by mutations in the gene for fibrillin-1 (FBN1). The leading cause of premature death in untreated individuals with MFS is acute aortic dissection, which often follows a period of progressive dilatation of the ascending aorta. Recent research on the molecular physiology of fibrillin and the pathophysiology of MFS and related disorders has changed our understanding of this disorder by demonstrating changes in growth factor signalling and in matrix-cell interactions. The purpose of this review is to provide a comprehensive overview of recent advances in the molecular biology of fibrillin and fibrillin-rich microfibrils. Mutations in FBN1 and other genes found in MFS and related disorders will be discussed, and novel concepts concerning the complex and multiple mechanisms of the pathogenesis of MFS will be explained.
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Affiliation(s)
- P N Robinson
- Institute of Medical Genetics, Charité University Hospital, Humboldt University, Augustenburger Platz 1, 13353 Berlin, Germany.
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33
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Abstract
The branch point sequence (BPS) is a conserved splicing signal important for spliceosome assembly and lariat intron formation. BPS mutations may result in aberrant pre-mRNA splicing and genetic disorders, but their phenotypic consequences have been difficult to predict, largely due to a highly degenerate nature of the BPS consensus. Here, we have examined the splicing pattern of nine reporter pre-mRNAs that have previously been shown to give rise to human hereditary diseases as a result of single-nucleotide substitutions in the predicted BPS. Increased exon skipping and intron retention observed in vivo were recapitulated for each mutated pre-mRNA, but the reproducibility of cryptic splice site activation was lower. BP mutations in reporter pre-mRNAs frequently induced aberrant 3' splice sites and also activated a cryptic 5' splice site. Systematic mutagenesis of BP adenosines showed that in most pre-mRNAs, the expression of canonical transcripts was lower for BP transitions than BP transversions. Differential splicing outcome for transitions vs. transversions was abrogated or reduced if introns were truncated to 200 nt or less, suggesting that the nature of the BP residue is less critical for interactions across very short introns. Together, these results improve prediction of phenotypic consequences of point mutations upstream of splice acceptor sites and suggest that the overrepresentation of disease-causing adenosine-to-guanosine BP substitutions observed in Mendelian disorders is due to more profound defects of gene expression at the level of pre-mRNA splicing.
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Affiliation(s)
- Jana Královicová
- Division of Human Genetics, School of Medicine, University of Southampton, Southampton, United Kingdom
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34
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Abstract
The reported mortality from intrahepatic bile duct tumours is increasing markedly in industrialised countries, for reasons that remain unknown. Inactivation of the tumour suppressor gene p53, is the commonest genetic abnormality in human cancer and has been implicated in the genesis of cholangiocarcinoma in various immunohistochemical and molecular epidemiological investigations, including gene sequencing studies. The structure and function of p53 and its role in linking cancer to specific carcinogens by way of mutational signatures is reviewed. The findings of previous p53 studies and their relevance in human cholangiocarcinoma are summarised.
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Affiliation(s)
- Shahid A Khan
- Liver Unit, St Mary's Campus, Hammersmith Hospital Campus, Faculty of Medicine, Imperial College, London, UK.
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35
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Filla MB, Czirók A, Zamir EA, Little CD, Cheuvront TJ, Rongish BJ. Dynamic imaging of cell, extracellular matrix, and tissue movements during avian vertebral axis patterning. ACTA ACUST UNITED AC 2004; 72:267-76. [PMID: 15495182 DOI: 10.1002/bdrc.20020] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Vertebrate axis patterning depends on cell and extracellular matrix (ECM) repositioning and proper cell-ECM interactions. However, there are few in vivo data addressing how large-scale tissue deformations are coordinated with the motion of local cell ensembles or the displacement of ECM constituents. Combining the methods of dynamic imaging and experimental biology allows both cell and ECM fate-mapping to be correlated with ongoing tissue deformations. These fate-mapping studies suggest that the axial ECM components "move" both as a composite meshwork and as autonomous particles, depending on the length scale being examined. Cells are also part of this composite, and subject to passive displacements resulting from tissue deformations. However, in contrast to the ECM, cells are self-propelled. The net result of cell and ECM displacements, along with proper ECM-cell adhesion, is the assembly of new tissue architecture. Data herein show that disruption of normal cell-ECM interactions during axis formation results in developmental abnormalities and a disorganization of the ECM. Our goal in characterizing the global displacement patterns of axial cells and ECM is to provide critical information regarding existing strain fields in the segmental plate and paraxial mesoderm. Deducing the mechanical influences on cell behavior is critical, if we are to understand vertebral axis patterning. Supplementary material for this article is available online at http://www.mrw.interscience.wiley.com/suppmat/1542-975X/suppmat/72/v72.266.html.
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Affiliation(s)
- Michael B Filla
- Department of Anatomy and Cell Biology, University of Kansas Medical Center, Kansas City, Kansas 66160, USA
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Kenney MC, Zorapapel N, Atilano S, Chwa M, Ljubimov A, Brown D. Insulin-like growth factor-I (IGF-I) and transforming growth factor-beta (TGF-beta) modulate tenascin-C and fibrillin-1 in bullous keratopathy stromal cells in vitro. Exp Eye Res 2003; 77:537-46. [PMID: 14550395 DOI: 10.1016/s0014-4835(03)00218-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE Pseudophakic bullous keratopathy (PBK) is a major indication for corneal transplantation. Previous studies showed that PBK corneas had increased levels of insulin-like growth factor-I (IGF-I), bone morphogenetic protein-4 (BMP-4), transforming growth factor-beta (TGF-beta), interleukin-1alpha (IL-1alpha) and IL-8. The PBK corneas also had accumulations of tenascin-C (TN-C), fibrillin-1 (Fib-1), matrix metalloproteinase-2 (MMP-2), inflammatory cells but not myofibroblasts. Our goal is to determine if the growth factors/cytokines that are elevated in PBK corneas alter the expression of extracellular matrix (ECM) and/or degradative enzymes in vitro. METHODS Stromal cell cultures from normal and PBK human corneas were established and treated for 6 days with IGF-I, BMP-4, IL-1alpha, IL-8 or TGF-beta1/beta2. Immunostaining, Western blot and dot blot analyses for TN-C, Fib-1, alpha-smooth muscle actin (alpha-SMA, a marker for myofibroblasts) or tissue inhibitor of metalloproteinase-1 (TIMP-1) were performed. RNAs were collected and analyzed with Northern blots for TN-C, Fib-1 and beta(2)-microglobulin. Culture media were analyzed using gelatin zymography with or without ethylenediaminetetraacetic acid (EDTA). Some samples were activated with p-aminophenylmercuric acetate (APMA) and reduction/alkylation, and the degradative activities were measured by the MMP-gelatinase activity assay kit. RESULTS The IGF-I and TGF-beta1/TGF-beta2 increased (a) TN-C protein deposition, and (b) Fib-1 protein and RNA levels, but (c) had no significant affect on TIMP-1, matrix metalloproteinase-2 (MMP-2) or gelatinase activities. TGF-beta1/TGF-beta2 induced alpha-SMA protein (myofibroblasts) while IGF-I did not. BMP-4, IL-1alpha and IL-8 had little affect on the cells. CONCLUSIONS Based upon our data, the fibrotic markers, TN-C and Fib-1, found in PBK corneas may be accounted for by IGF-I and TGF-beta. These growth factors promote fibrosis and ECM deposition without promoting proteolysis. While the other growth factors/cytokines are elevated in PBK corneas, their role(s) in PBK pathogenesis are not clear. In addition, exogenous IGF-I most closely elicited a response that was most similar to the characteristics of the PBK/ABK corneas, i.e. accumulation of TN-C and Fib-1 proteins in the absence of myofibroblasts.
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Affiliation(s)
- M Cristina Kenney
- Department of Ophthalmology, College of Medicine, University of California, Irvine, 101 The City Drive, Building 55, Room 220, Orange, CA 92868, USA.
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37
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Samuel CS, Sakai LY, Amento EP. Relaxin regulates fibrillin 2, but not fibrillin 1, mRNA and protein expression by human dermal fibroblasts and murine fetal skin. Arch Biochem Biophys 2003; 411:47-55. [PMID: 12590922 DOI: 10.1016/s0003-9861(02)00710-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Relaxin modulates connective tissue remodeling by altering matrix molecule expression. We have found that relaxin specifically inhibits a microfibril component, fibrillin 2 (FBN2), without affecting fibrillin 1 (FBN1). Human dermal fibroblasts (HDFs) grown or stimulated to overexpress fibrillin expression were used to show that relaxin specifically down-regulated FBN2 mRNA and protein levels. Continuous exposure of HDFs to relaxin (30ng/ml) significantly (P<0.05) decreased fibrillin 2 protein (40%) while FBN1 protein expression was unchanged. Our in vitro studies were confirmed using relaxin null mice whereby the absence of relaxin was associated with increased FBN2 mRNA and protein in fetal skin from pregnant relaxin knockout mice. The regulation of FBN2 expression may be associated with functional changes in elastic tissues during development and growth.
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Affiliation(s)
- Chrishan S Samuel
- Molecular Medicine Research Institute, 525 Del Rey Avenue, Suite B, Sunnyvale, CA 94085, USA.
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38
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Kölble N, Wisser J, Babcock D, Maslen C, Huch R, Steinmann B. Prenatal ultrasound findings in a fetus with congenital contractural arachnodactyly. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2002; 20:395-399. [PMID: 12383326 DOI: 10.1046/j.1469-0705.2002.00819.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Congenital contractural arachnodactyly (CCA) or Beals-Hecht syndrome is an autosomal dominant disorder caused by mutations in the fibrillin-2 (FBN2) gene. The principal features of CCA are a marfanoid habitus, multiple congenital contractures, camptodactyly, arachnodactyly, kyphoscoliosis, muscular hypoplasia, and external ear malformations. Our case is the first that shows typical sonographic signs in a fetus at 25 weeks' gestation with molecular genetically verified CCA in a large family with many members affected over four generations. This demonstrates that CCA can be detected prenatally by non-invasive ultrasonography. The importance of confirmation of CCA by means of DNA sequence analysis of the FBN2 gene is stressed.
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Affiliation(s)
- N Kölble
- Unit of Perinatal Physiology, Department of Obstetrics, University Hospital, Zurich, Switzerland.
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Breuer DK, Yashar BM, Filippova E, Hiriyanna S, Lyons RH, Mears AJ, Asaye B, Acar C, Vervoort R, Wright AF, Musarella MA, Wheeler P, MacDonald I, Iannaccone A, Birch D, Hoffman DR, Fishman GA, Heckenlively JR, Jacobson SG, Sieving PA, Swaroop A. A comprehensive mutation analysis of RP2 and RPGR in a North American cohort of families with X-linked retinitis pigmentosa. Am J Hum Genet 2002; 70:1545-54. [PMID: 11992260 PMCID: PMC379141 DOI: 10.1086/340848] [Citation(s) in RCA: 186] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2002] [Accepted: 03/21/2002] [Indexed: 11/03/2022] Open
Abstract
X-linked retinitis pigmentosa (XLRP) is a clinically and genetically heterogeneous degenerative disease of the retina. At least five loci have been mapped for XLRP; of these, RP2 and RP3 account for 10%-20% and 70%-90% of genetically identifiable disease, respectively. However, mutations in the respective genes, RP2 and RPGR, were detected in only 10% and 20% of families with XLRP. Mutations in an alternatively spliced RPGR exon, ORF15, have recently been shown to account for 60% of XLRP in a European cohort of 47 families. We have performed, in a North American cohort of 234 families with RP, a comprehensive screen of the RP2 and RPGR (including ORF15) genes and their 5' upstream regions. Of these families, 91 (39%) show definitive X-linked inheritance, an additional 88 (38%) reveal a pattern consistent with X-linked disease, and the remaining 55 (23%) are simplex male patients with RP who had an early onset and/or severe disease. In agreement with the previous studies, we show that mutations in the RP2 gene and in the original 19 RPGR exons are detected in <10% and approximately 20% of XLRP probands, respectively. Our studies have revealed RPGR-ORF15 mutations in an additional 30% of 91 well-documented families with X-linked recessive inheritance and in 22% of the total 234 probands analyzed. We suggest that mutations in an as-yet-uncharacterized RPGR exon(s), intronic changes, or another gene in the region might be responsible for the disease in the remainder of this North American cohort. We also discuss the implications of our studies for genetic diagnosis, genotype-phenotype correlations, and gene-based therapy.
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Affiliation(s)
- Debra K. Breuer
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Beverly M. Yashar
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Elena Filippova
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Suja Hiriyanna
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Robert H. Lyons
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Alan J. Mears
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Bersabell Asaye
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Ceren Acar
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Raf Vervoort
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Alan F. Wright
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Maria A. Musarella
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Patricia Wheeler
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Ian MacDonald
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Alessandro Iannaccone
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - David Birch
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Dennis R. Hoffman
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Gerald A. Fishman
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - John R. Heckenlively
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Samuel G. Jacobson
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Paul A. Sieving
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
| | - Anand Swaroop
- Departments of Human Genetics, Ophthalmology and Visual Sciences, and Biological Chemistry and Sequencing Core Facility, University of Michigan, Ann Arbor; Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh; Department of Ophthalmology, SUNY Downstate Medical Center, Brooklyn; New England Medical Center, Boston; Department of Ophthalmology, University of Alberta, Edmonton, Alberta; Department of Ophthalmology, University of Tennessee Health Science Center, Memphis; Retina Foundation of the Southwest, Dallas; University of Illinois at Chicago, Chicago; Jules Stein Eye Institute, University of California at Los Angeles, Los Angeles; Scheie Eye Institute, University of Pennsylvania, Philadelphia; and National Eye Institute, Bethesda, MD
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Roos D, Meischl C, de Boer M, Simsek S, Weening RS, Sanal O, Tezcan I, Güngör T, Law SKA. Genetic analysis of patients with leukocyte adhesion deficiency: genomic sequencing reveals otherwise undetectable mutations. Exp Hematol 2002; 30:252-61. [PMID: 11882363 DOI: 10.1016/s0301-472x(01)00782-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
OBJECTIVE The aim of this study was to analyze mutations in DNA from patients with leukocyte adhesion deficiency (LAD), an immunodeficiency caused by absence of the beta(2) subunit (CD18) of the leukocyte integrins LFA-1 (CD11a/CD18), Mac-1 (CD11b/CD18), p150,95 (CD11c/CD18), and CR4 (CD11d/CD18). METHODS We developed genomic DNA PCR sequencing to detect mutations not only in exons but also in introns. RESULTS Eight LAD patients were analyzed, of which five had homozygous mutations, i.e., a 0.8-kb deletion, a branchpoint mutation in intron 5 causing mRNA missplicing, a nonsense mutation, and two missense mutations. Four of these mutations are novel. We cotransfected the two mutant CD18 proteins with normal CD11a, b, or c in COS cells. This resulted in absence of all three beta(2) integrins on the surface of cells transfected with CD18(252Arg). However, CD18(593Cys) supported some LFA-1 and p150,95 formation in COS cells. The other three patients were compound heterozygotes in which only one allele had previously been characterized, because the other alleles were undetectable at the cDNA level. We identified the unknown mutations as a novel two-nucleotide deletion, a nonsense mutation, and a single nucleotide deletion. CONCLUSION Our method allows identification of mutations in CD18 from genomic DNA. This opens the possibility of early prenatal diagnosis of LAD and reliable carrier detection.
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Affiliation(s)
- Dirk Roos
- Central Laboratory Netherlands Blood Transfusion Service (CLB) and Laboratory for Experimental and Clinical Immunology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
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Gupta PA, Putnam EA, Carmical SG, Kaitila I, Steinmann B, Child A, Danesino C, Metcalfe K, Berry SA, Chen E, Delorme CV, Thong MK, Adès LC, Milewicz DM. Ten novel FBN2 mutations in congenital contractural arachnodactyly: delineation of the molecular pathogenesis and clinical phenotype. Hum Mutat 2002; 19:39-48. [PMID: 11754102 DOI: 10.1002/humu.10017] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Congenital contractural arachnodactyly (CCA) is an autosomal dominant condition that shares skeletal features with Marfan syndrome (MFS), but does not have the ocular and cardiovascular complications that characterize MFS. CCA and MFS result from mutations in highly similar genes, FBN2 and FBN1, respectively. All the identified CCA mutations in FBN2 cluster in a limited region similar to where severe MFS mutations cluster in FBN1, specifically between exons 23 and 34. We screened exons 22 through 36 of FBN2 for mutations in 13 patients with classic CCA by single stranded conformational polymorphism analysis (SSCP) and then by direct sequencing. We successfully identified 10 novel mutations in this critical region of FBN2 in these patients, indicating a mutation detection rate of 75% in this limited region. Interestingly, none of these identified FBN2 mutations alter amino acids in the calcium binding consensus sequence in the EGF-like domains, whereas many of the FBN1 mutations alter the consensus sequence. Furthermore, analysis of the clinical data of the CCA patients with characterized FBN2 mutation indicate that CCA patients have aortic root dilatation and the vast majority lack evidence of congenital heart disease. These studies have implications for our understanding of the molecular basis of CCA, along with the diagnosis and genetic counseling of CCA patients.
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Affiliation(s)
- Prateek A Gupta
- Department of Internal Medicine, University of Texas-Houston Medical School, Houston, Texas, USA
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Abstract
Mutation detection based on ribonuclease cleavage of basepair mismatches in single-stranded RNA probes hybridized to DNA targets was first described over 15 years ago. The original methods relied on RNase A for mismatch cleavage; however, this enzyme fails to cleave many mismatches and has other drawbacks. More recently, a new method for RNase-cleavage-based mutation scanning has been developed, which takes advantage of the ability of RNase 1 and RNase T1 to cleave mismatches in duplex RNA targets, when these enzymes are used in conjunction with nucleic acid intercalating dyes. The method, called NIRCA, is relatively low-cost in terms of materials and equipment required. It is being used to detect mutations and SNPs in a wide variety of genes involved in human genetic disease and cancer, as well as in disease-related viral and bacterial genes. This review describes historical and recently developed RNase cleavage-based methods for mutation/SNP scanning.
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Scola RH, Werneck LC, Iwamoto FM, Ribas LC, Raskin S, Correa Neto Y. Congenital contractural arachnodactyly with neurogenic muscular atrophy: case report. ARQUIVOS DE NEURO-PSIQUIATRIA 2001; 59:259-62. [PMID: 11400038 DOI: 10.1590/s0004-282x2001000200022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We report the case of a 3-(1/2)-year-old girl with hypotonia, multiple joint contractures, hip luxation, arachnodactyly, adducted thumbs, dolichostenomelia, and abnormal external ears suggesting the diagnosis of congenital contractural arachnodactyly (CCA). The serum muscle enzymes were normal and the needle electromyography showed active and chronic denervation. The muscle biopsy demonstrated active and chronic denervation compatible with spinal muscular atrophy. Analysis of exons 7 and 8 of survival motor neuron gene through polymerase chain reaction did not show deletions. Neurogenic muscular atrophy is a new abnormality associated with CCA, suggesting that CCA is clinically heterogeneous.
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Affiliation(s)
- R H Scola
- Serviços de Neurologia e Doenças Neuromusculares e Disciplina de Propedêutica Médica, Departamento de Clínica Médica, Hospital de Clínicas, Universidade Federal do Paraná.
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Zhu X, Chung I, O'Gorman MR, Scholl PR. Coexpression of Normal and Mutated CD40 Ligand with Deletion of a Putative RNA Lariat Branchpoint Sequence in X-Linked Hyper-IgM Syndrome. Clin Immunol 2001; 99:334-9. [PMID: 11358428 DOI: 10.1006/clim.2001.5022] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We describe a novel CD40 ligand (CD40L) splicing mutation in a patient with X-linked hyper-IgM syndrome (X-HIM) associated with alternate splicing of exon 3, resulting in the expression of both full-length and exon-3-skipped CD40L mRNA. The mutation is an 8-bp deletion 25 bp upstream of the intron 2/exon 3 junction which overlaps a putative RNA branchpoint, suggesting that it may impair RNA lariat formation. The exon-3-skipped CD40L transcript encodes a truncated protein (CD40LDeltaE3) encompassing the cytoplasmic, transmembrane, and extracellular stalk domains, but lacking the CD40L receptor binding domain. CD40LDeltaE3 protein expression was readily detectable in transfected Cos cells by immunofluorescence. In cells cotransfected with CD40LDeltaE3 and wild-type CD40L, expression of CD40LDeltaE3 did not inhibit the expression of wild-type CD40L monomers, but strongly inhibited staining by the conformationally sensitive anti-CD40L mAb 5c8, suggesting that CD40LDeltaE3 acts in a dominant negative manner to inhibit the assembly of functional CD40L trimers. This mechanism may contribute to the pathophysiology of CD40L deficiency in X-HIM patients with leaky splice site mutations.
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Affiliation(s)
- X Zhu
- Disease Pathogenesis Program, Children's Memorial Institute for Education and Research, Chicago, Illinois 60614, USA
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Campbell BG, Wootton JA, Macleod JN, Minor RR. Canine COL1A2 mutation resulting in C-terminal truncation of pro-alpha2(I) and severe osteogenesis imperfecta. J Bone Miner Res 2001; 16:1147-53. [PMID: 11393792 DOI: 10.1359/jbmr.2001.16.6.1147] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
RNA and type I collagen were analyzed from cultured skin fibroblasts of a Beagle puppy with fractures consistent with type III osteogenesis imperfecta (OI). In a nonisotopic RNAse cleavage assay (NIRCA), the proband's RNA had a unique cleavage pattern in the region of COL1A2 encoding the C-propeptide. DNA sequence analyses identified a mutation in which nucleotides 3991-3994 ("CTAG") were replaced with "TGTCATTGG." The first seven bases of the inserted sequence were identical to nucleotides 4002-4008 of the normal canine COL1A2 sequence. The resulting frameshift changed 30 amino acids and introduced a premature stop codon. Reverse-transcription polymerase chain reaction (RT-PCR) with primers flanking the mutation site amplified two complementary DNA (cDNA) fragments for the proband and a single product for the control. Restriction enzyme digestions also were consistent with a heterozygous mutation in the proband. Type I procollagen labeled with [3H]proline was analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Increased density of pC-alpha2(I) suggested comigration with the similarly sized pro-alpha2(I) derived from the mutant allele. Furthermore, a-chains were overhydroxylated and the ratio of alpha1(I):alpha2(I) was 3.2:1, consistent with the presence of alpha1(I) homotrimers. Analyses of COL1A2 and type I collagen were both consistent with the described heterozygous mutation affecting the pro-alpha2(I) C-propeptide and confirmed a diagnosis of OI.
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Affiliation(s)
- B G Campbell
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA
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Watkins HC, Goldrick M. Detection of mutations by RNase cleavage. CURRENT PROTOCOLS IN HUMAN GENETICS 2001; Chapter 7:Unit 7.2. [PMID: 18428304 DOI: 10.1002/0471142905.hg0702s14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Ribonucleases can specifically recognize and cleave RNA at the site of sequence mismatches in RNA-DNA or RNA-RNA hybrids. The cleavage products are then characterized by gel electrophoresis. In this unit, a procedure is presented for RNase cleavage of (32)P-labeled riboprobes (transcribed from a cloned copy of the normal sequence) that have been annealed to amplified sequences of a candidate gene or cDNA obtained from affected individuals. A Support Protocol explains how to prepare riboprobes from a genomic or cDNA template obtained from a nonmutant individual. An alternate protocol describes cleavage of RNARNA hybrids using a nonisotopic RNase cleavage mutation assay. Sequential PCR and in vitro transcription steps generate sufficient quantities of duplex RNA targets so that the cleavage products can be detected on a gel by ethidium bromide staining. The unit also discusses the use of alternative ribonucleases for cleaving singlebase mismatches.
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Majors AK, Pyeritz RE. A deficiency of cysteine impairs fibrillin-1 deposition: implications for the pathogenesis of cystathionine beta-synthase deficiency. Mol Genet Metab 2000; 70:252-60. [PMID: 10993712 DOI: 10.1006/mgme.2000.3024] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cystathionine beta-synthase (CBS) deficiency is an inborn error of amino acid metabolism that has pleiotropic manifestations and is commonly called "homocystinuria." The features include skeletal, ocular, and vascular defects, some of which are reminiscent of those found in Marfan syndrome (MFS). Because of the spectrum of clinical effects, the pathogenesis of homocystinuria has long been thought to involve the extracellular matrix (ECM), and the condition has been classified as a heritable disorder of connective tissue. Because of the superficial similarities with MFS, we and others (Pyeritz, in McKusicks Heritable Disorders of Connective Tissue, St. Louis, Mosby-Year Book Inc., 5th ed., pp 137-178, 1993; Pyeritz, in Principles and Practice of Medical Genetics, New York, Churchill Livingstone, 3rd ed., pp 1027-1066, 1997; Mudd, Levy, and Skovby, in The Metabolic and Molecular Bases of Inherited Disease, New York, McGraw-Hill Publishing Co., 7th ed., pp 1279-1327, 1995) have speculated how CBS deficiency might affect fibrillin-1, the protein altered in MFS. For example, the altered plasma concentrations of homocysteine and/or cysteine in patients with CBS deficiency may hinder fibrillin-1 synthesis, deposition, or both. When arterial smooth muscle cells were cultured under conditions of cysteine deficiency, fibrillin-1 deposition into the ECM was greatly diminished as revealed by immunocytochemistry. Excessive homocysteine, in contrast, had little, if any, effect on fibrillin-1 deposition. When cysteine concentrations were returned to normal, the smooth muscle cells began to accumulate a matrix rich in fibrillin-1. Type I collagen, the major matrix component synthesized by these smooth muscle cells, was not reduced by low cysteine concentrations nor high homocysteine concentrations. These results demonstrate that a deficiency of cysteine and subsequent inhibition of fibrillin-1 accumulation in CBS deficient patients may be at least partly responsible for their phenotype, and suggest that maintenance of normal plasma cyst(e)ine levels may be an important therapeutic goal.
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Affiliation(s)
- A K Majors
- Department of Human Genetics, MCP Hahnemann School of Medicine, Pittsburgh, Pennsylvania 15212, USA.
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48
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Janecke AR, Meins M, Sadeghi M, Grundmann K, Apfelstedt-Sylla E, Zrenner E, Rosenberg T, Gal A. Twelve novel myosin VIIA mutations in 34 patients with Usher syndrome type I: confirmation of genetic heterogeneity. Hum Mutat 2000; 13:133-40. [PMID: 10094549 DOI: 10.1002/(sici)1098-1004(1999)13:2<133::aid-humu5>3.0.co;2-u] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Usher syndrome is a heterogeneous autosomal recessive trait and the most common cause of hereditary deaf-blindness. Usher syndrome type I (USH1) is characterised by profound congenital sensorineural hearing loss, vestibular dysfunction, and prepubertal onset of retinitis pigmentosa. Of the at least six different loci for USH1, USH1B maps on chromosome 11q13, and the MYO7A gene has been shown to be defective in USH1B. MYO7A encodes myosin VIIA, an unconventional myosin, and it consists of 48 coding exons. In this study, MYO7A was analysed in 34 unrelated Usher type I patients by single-strand conformation polymorphism analysis and direct sequencing. We identified a total of 12 novel and unique mutations, all single base changes. In addition, we found a previously reported nonsense mutation (C31X) on nine alleles of a total of six patients from Denmark.
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Affiliation(s)
- A R Janecke
- Institut für Humangenetik, Universitäts-Krankenhaus Eppendorf, Hamburg, Germany
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49
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Belleh S, Zhou G, Wang M, Der Kaloustian VM, Pagon RA, Godfrey M. Two novel fibrillin-2 mutations in congenital contractural arachnodactyly. ACTA ACUST UNITED AC 2000. [DOI: 10.1002/(sici)1096-8628(20000501)92:1<7::aid-ajmg2>3.0.co;2-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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50
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Hallsson JH, Favor J, Hodgkinson C, Glaser T, Lamoreux ML, Magnúsdóttir R, Gunnarsson GJ, Sweet HO, Copeland NG, Jenkins NA, Steingrímsson E. Genomic, transcriptional and mutational analysis of the mouse microphthalmia locus. Genetics 2000; 155:291-300. [PMID: 10790403 PMCID: PMC1461060 DOI: 10.1093/genetics/155.1.291] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Mouse microphthalmia transcription factor (Mitf) mutations affect the development of four cell types: melanocytes, mast cells, osteoclasts, and pigmented epithelial cells of the eye. The mutations are phenotypically diverse and can be arranged in an allelic series. In humans, MITF mutations cause Waardenburg syndrome type 2A (WS2A) and Tietz syndrome, autosomal dominant disorders resulting in deafness and hypopigmentation. Mitf mice thus represent an important model system for the study of human disease. Here we report the complete exon/intron structure of the mouse Mitf gene and show it to be similar to the human gene. We also found that the mouse gene is transcriptionally complex and is capable of generating at least 13 different Mitf isoforms. Some of these isoforms are missing important functional domains of the protein, suggesting that they might play an inhibitory role in Mitf function and signal transduction. In addition, we determined the molecular basis for six microphthalmia mutations. Two of the mutations are reported for the first time here (Mitf(mi-enu198) and Mitf(mi-x39)), while the others (Mitf(mi-ws), Mitf(mi-bws), Mitf(mi-ew), and Mitf(mi-di)) have been described but the molecular basis for the mutation not determined. When analyzed in terms of the genomic and transcriptional data presented here, it is apparent that these mutations result from RNA processing or transcriptional defects. Interestingly, three of the mutations (Mitf(mi-x39), Mitf(mi-bws), and Mitf(mi-ws)) produce proteins that are missing important functional domains of the protein identified in in vitro studies, further confirming a biological role for these domains in the whole animal.
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Affiliation(s)
- J H Hallsson
- Department of Biochemistry and Molecular Biology, School of Medicine, University of Iceland, 101 Reykjavík, Iceland
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