1
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García-Díaz JDD, Balsa-Vázquez J, Rodríguez-Villa A, Férriz E. Different de novo mutations in the NF1 gene in a family with neurofibromatosis type 1. Pediatr Dermatol 2024. [PMID: 39225241 DOI: 10.1111/pde.15734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Accepted: 07/30/2024] [Indexed: 09/04/2024]
Abstract
The criteria for clinical diagnosis of neurofibromatosis type 1 (NF1) are not sensitive in young children. Recognition is easier when one of their parents has been diagnosed with this condition, and the causal mutation is known. We present a case of a girl with isolated café-au-lait spots, whose father was diagnosed with NF1. However, both were found to carry different de novo mutations in the NF1 gene. This possibility has significant implications for the diagnostic process and genetic counseling.
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Affiliation(s)
- Juan de Dios García-Díaz
- Clinical Genetics Unit, Department of Internal Medicine, University Hospital Príncipe de Asturias, University of Alcalá, Madrid, Spain
| | - Javier Balsa-Vázquez
- Clinical Genetics Unit, Department of Internal Medicine, University Hospital Príncipe de Asturias, University of Alcalá, Madrid, Spain
| | - Ana Rodríguez-Villa
- Department of Dermatology, University Hospital Príncipe de Asturias, University of Alcalá, Madrid, Spain
| | - Esther Férriz
- Department of Medical Genetics, Health in Code, Valencia, Spain
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2
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Terlouw D, Hes FJ, Suerink M, Boot A, Langers AMJ, Tops CM, van Leerdam ME, van Asperen CJ, Rozen SG, Bijlsma EK, van Wezel T, Morreau H, Nielsen M. APC mosaicism, not always isolated: two first-degree relatives with apparently distinct APC mosaicism. Gut 2023; 72:2186-2187. [PMID: 36307181 DOI: 10.1136/gutjnl-2022-328540] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 10/16/2022] [Indexed: 12/08/2022]
Affiliation(s)
- Diantha Terlouw
- Department of Clinical Genetics, Leids Universitair Medisch Centrum, Leiden, The Netherlands
- Department of Pathology, Leids Universitair Medisch Centrum, Leiden, The Netherlands
| | - Frederik J Hes
- Centre for Medical Genetics, Universitair Ziekenhuis Brussel (UZ Brussel), Brussels, Belgium
| | - Manon Suerink
- Department of Clinical Genetics, Leids Universitair Medisch Centrum, Leiden, The Netherlands
| | - Arnoud Boot
- Department of Cancer and Stem Cell Biology, Duke-NUS Medical School, Singapore
| | - Alexandra M J Langers
- Department of Gastroenterology and Hepatology, Leids Universitair Medisch Centrum, Leiden, The Netherlands
| | - Carli M Tops
- Department of Clinical Genetics, Leids Universitair Medisch Centrum, Leiden, The Netherlands
| | - Monique E van Leerdam
- Department of Gastroenterology and Hepatology, Leids Universitair Medisch Centrum, Leiden, The Netherlands
| | - Christi J van Asperen
- Department of Clinical Genetics, Leids Universitair Medisch Centrum, Leiden, The Netherlands
| | - Steve G Rozen
- Department of Cancer and Stem Cell Biology, Duke-NUS Medical School, Singapore
| | - Emilia K Bijlsma
- Department of Clinical Genetics, Leids Universitair Medisch Centrum, Leiden, The Netherlands
| | - Tom van Wezel
- Department of Pathology, Leids Universitair Medisch Centrum, Leiden, The Netherlands
| | - Hans Morreau
- Department of Pathology, Leids Universitair Medisch Centrum, Leiden, The Netherlands
| | - Maartje Nielsen
- Department of Clinical Genetics, Leids Universitair Medisch Centrum, Leiden, The Netherlands
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3
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Mowrey K, Koenig MK, Szabo CA, Samuels J, Mulligan S, Pearson DA, Northrup H. Two different genetic etiologies for tuberous sclerosis complex (TSC) in a single family. Mol Genet Genomic Med 2020; 8:e1296. [PMID: 32383331 PMCID: PMC7336739 DOI: 10.1002/mgg3.1296] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 04/14/2020] [Accepted: 04/15/2020] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Tuberous sclerosis complex (TSC) is an autosomal dominant genetic condition that involves abnormalities of the skin, hamartomas in the heart, brain, and kidneys, seizures, as well as TSC-associated neuropsychiatric disorders (TAND). About 90%-95% of individuals with TSC will have an identifiable pathogenic variant in either TSC1 or TSC2. We present here two family members with clinical diagnoses of TSC that were later determined to be due to two different genetic etiologies. METHODS A 2-year-old Caucasian female (Patient 1) was born to non-consanguineous healthy parents and was determined to have a clinical diagnosis of TSC at 2 months old. Her paternal great-uncle (Patient 2) was also known to have a clinical diagnosis of TSC. Sequencing and deletion/duplication analysis for TSC1 and TSC2 were performed on both individuals. RESULTS Mutation analysis revealed that both Patient 1 and Patient 2 had identifiable pathogenic variants in TSC2. Patient 1 had c.4800_4801delTG (p.Cys1600Trpfs*2), while Patient 2 had c.4470_4471delinsTT (p.Glu1490_Lys1491delinsAsp*). CONCLUSION To our knowledge, our clinical report is of significance as it is the third kindred to be identified with affected members with two distinct genetic etiologies for TSC. Our case report highlights the importance of incorporating genetic testing into the clinical evaluation for individuals with features suggestive of TSC.
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Affiliation(s)
- Kate Mowrey
- Department of PediatricsDivision of Medical GeneticsMcGovern Medical SchoolUniversity of Texas Health Science Center at HoustonHoustonTXUSA
| | - Mary Kay Koenig
- Department of PediatricsDivision of Child and Adolescent NeurologyMcGovern Medical SchoolUniversity of Texas Health Science Center at HoustonHoustonTXUSA
| | - Charles A. Szabo
- Department of Neurology and South Texas Comprehensive Epilepsy CenterUniversity of Texas Health Science Center at San AntonioTXUSA
| | - Joshua Samuels
- Department of PediatricsDivision of Nephrology and HypertensionMcGovern Medical SchoolUniversity of Texas Health Science Center at HoustonHoustonTXUSA
| | - Shannon Mulligan
- Department of Obstetrics, Gynecology and Reproductive SciencesDivision of Genetic CounselingMcGovern Medical SchoolUniversity of Texas Health Science Center at HoustonHoustonTXUSA
| | - Deborah A. Pearson
- Department of Psychiatry and Behavioral SciencesMcGovern Medical School at University of Texas Health Science Center at HoustonHoustonTXUSA
| | - Hope Northrup
- Department of PediatricsDivision of Medical GeneticsMcGovern Medical SchoolUniversity of Texas Health Science Center at HoustonHoustonTXUSA
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4
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Cui J, Yu X, Liang S, Zhang S, Hu X. First five generations Chinese family of tuberous scleroses complex due to a new mutation of the TSC1 gene. J Clin Neurosci 2018; 54:39-44. [PMID: 29803333 DOI: 10.1016/j.jocn.2018.05.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 02/09/2018] [Accepted: 05/17/2018] [Indexed: 12/11/2022]
Abstract
Tuberous scleroses complex (TSC) is a rare neurocutaneous syndrome and has autosomal dominant inheritance. However, larger family with TSC is very rare. Here, we report the first five generations family with TSC from China, and localize the pathogenic gene. A boy with TSC and epilepsy underwent preoperative evaluation and epileptic surgery. His TSC family history was gotten, and the clinical data of a Chinese family with TSC were collected in 2016. Complete exons sequencing was performed in the proband and his parents, and whole exons sequence of TSC was performed in the other family members. The family showed autosomal dominant inheritance, and it was the largest reported family with TSC. In this pedigree, there were 14 patients in 5 generations, but only 1 case with epilepsy in them. All of examined patients had TSC 1 gene exon 15 c.1846delG p.A616Pfs*13 mutation. In conclusion, TSC patients with TSC 1 deletion presented mild neurological symptom and rendered larger family.
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Affiliation(s)
- Jianfei Cui
- Department of Neurosurgery, First Affiliated Hospital of PLA General Hospital, Beijing, China; First Affiliated Hospital of PLA General Hospital Graduate Training Base, Jinzhou Medical University, Jinzhou, China
| | - Xiaoman Yu
- Department of Neurosurgery, First Affiliated Hospital of PLA General Hospital, Beijing, China
| | - Shuli Liang
- Department of Neurosurgery, First Affiliated Hospital of PLA General Hospital, Beijing, China; First Affiliated Hospital of PLA General Hospital Graduate Training Base, Jinzhou Medical University, Jinzhou, China; Department of Neurosurgery, PLA General Hospital, Beijing, China.
| | - Shaohui Zhang
- Department of Neurosurgery, Capital Epilepsy Therapy Center, First Affiliated Hospital of PLA General Hospital, Beijing, China
| | - Xiaohong Hu
- Department of Pediatric, First Affiliated Hospital of PLA General Hospital, Beijing, China
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5
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Rosset C, Vairo F, Bandeira IC, Correia RL, de Goes FV, da Silva RTB, Bueno LSM, de Miranda Gomes MCS, Galvão HDCR, Neri JICF, Achatz MI, Netto CBO, Ashton-Prolla P. Molecular analysis of TSC1 and TSC2 genes and phenotypic correlations in Brazilian families with tuberous sclerosis. PLoS One 2017; 12:e0185713. [PMID: 28968464 PMCID: PMC5624610 DOI: 10.1371/journal.pone.0185713] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 09/18/2017] [Indexed: 12/22/2022] Open
Abstract
Tuberous sclerosis complex (TSC) is an autosomal dominant multisystem disorder characterized by the development of multiple hamartomas in many organs and tissues. It occurs due to inactivating mutations in either of the two genes, TSC1 and TSC2, following a second hit in a tumor suppressor gene in most hamartomas. Comprehensive screening for mutations in both the TSC1 and TSC2 loci has been performed in several cohorts of patients and a broad spectrum of pathogenic mutations have been described. In Brazil, there is no data regarding incidence and prevalence of tuberous sclerosis and mutations in TSC1 and TSC2. We analyzed both genes in 53 patients with high suspicion of tuberous sclerosis using multiplex-ligation dependent probe amplification and a customized next generation sequencing panel. Confirmation of all variants was done by the Sanger method. We identified 50 distinct variants in 47 (89%) of the patients. Five were large rearrangements and 45 were point mutations. The symptoms presented by our series of patients were not different between male and female individuals, except for the more common occurrence of shagreen patch in women (p = 0.028). In our series, consistent with other studies, TSC2 mutations were associated with a more severe phenotypic spectrum than TSC1 mutations. This is the first study that sought to characterize the molecular spectrum of Brazilian individuals with tuberous sclerosis.
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Affiliation(s)
- Clévia Rosset
- Laboratório de Medicina Genômica – Centro de Pesquisa Experimental – Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Programa de pós-graduação em genética e biologia molecular, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Filippo Vairo
- Serviço de Genética Médica, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Isabel Cristina Bandeira
- Laboratório de Medicina Genômica – Centro de Pesquisa Experimental – Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Rudinei Luis Correia
- Laboratório de Medicina Genômica – Centro de Pesquisa Experimental – Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Fernanda Veiga de Goes
- Instituto Fernandes Figueira, Fundação Osvaldo Cruz, Rio de Janeiro, Rio de Janeiro, Brazil
| | | | | | | | | | - João I. C. F. Neri
- Centro Especializado em Reabilitação e Habilitação, Natal, Rio Grande do Norte, Brazil
| | - Maria Isabel Achatz
- A.C. Camargo Cancer Center, São Paulo, São Paulo, Brazil
- Clinical Genetics Branch, Division of Cancer Epidemiology & Genetics, National Cancer Institute, National Institutes of Health, Rockville, United States of America
| | | | - Patricia Ashton-Prolla
- Laboratório de Medicina Genômica – Centro de Pesquisa Experimental – Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Programa de pós-graduação em genética e biologia molecular, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
- Serviço de Genética Médica, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Departamento de Genética - Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
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6
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Rosset C, Netto CBO, Ashton-Prolla P. TSC1 and TSC2 gene mutations and their implications for treatment in Tuberous Sclerosis Complex: a review. Genet Mol Biol 2017; 40:69-79. [PMID: 28222202 PMCID: PMC5409767 DOI: 10.1590/1678-4685-gmb-2015-0321] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 03/01/2016] [Indexed: 01/08/2023] Open
Abstract
Tuberous sclerosis complex is an autosomal dominant disorder characterized by skin
manifestations and formation of multiple tumors in different organs, mainly in the
central nervous system. Tuberous sclerosis is caused by the mutation of one of two
tumor suppressor genes, TSC1 or TSC2. Currently,
the development of novel techniques and great advances in high-throughput genetic
analysis made mutation screening of the TSC1 and
TSC2 genes more widely available. Extensive studies of the
TSC1 and TSC2 genes in patients with TSC
worldwide have revealed a wide spectrum of mutations. Consequently, the discovery of
the underlying genetic defects in TSC has furthered our
understanding of this complex genetic disorder, and genotype-phenotype correlations
are becoming possible, although there are still only a few clearly established
correlations. This review focuses on the main symptoms and genetic alterations
described in TSC patients from 13 countries in three continents, as well as on
genotype-phenotype correlations established to date. The determination of
genotype-phenotype correlations may contribute to the establishment of successful
personalized treatment for TSC.
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Affiliation(s)
- Clévia Rosset
- Laboratório de Medicina Genômica, Centro de Pesquisa Experimental. Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil.,Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | | | - Patricia Ashton-Prolla
- Laboratório de Medicina Genômica, Centro de Pesquisa Experimental. Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil.,Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.,Serviço de Genética Médica, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil.,Departamento de Genética, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
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7
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Tsai TS, Huang MY, Chang YT, Wang CY, Lin JL, Hung PC, Lin SP, Sun CF, Wang WS, Chang CM, Chang SC, Chu DC. High-resolution melting analysis is a more effective approach for screening TSC genes mutations. Genet Test Mol Biomarkers 2011; 15:415-21. [PMID: 21510812 DOI: 10.1089/gtmb.2010.0133] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Tuberous sclerosis complex (TSC) is an autosomal dominant disorder with a prevalence of 1 in 95,136 in Taiwan. TSC is characterized by hamartomatous lesions in multiple organ systems. Genetic defects in TSC1 and TSC2 genes are the main causes of TSC. A molecular screening protocol using denaturing high-performance liquid chromatography (dHPLC) followed by DNA sequencing is currently performed to locate the genetic lesions in many clinical laboratories. The current screening approach is time consuming and inefficient. In this study, we analyzed all coding exons of TSC1 and TSC2 genes of 30 TSC patients and 47 unaffected family members using the traditional dHPLC protocol and our recently developed diagnostic platform based on high-resolution melting analysis (HRM) followed by bidirectional DNA sequencing. Data indicated that 20 mutations, including 5 mutations in TSC1 (2 sporadic, 1 familial mutation, and 2 of uncertain origin) and 15 mutations in TSC2 (14 sporadic and 1 familial mutation), 8 single-nucleotide polymorphisms (SNPs, including 3 SNPs found in irrelevant individuals without TSC phenotypes studied in the control group), and 3 variants with undetermined significance were identified, including 4 novel mutations. The sensitivities of HRM and dHPLC for TSC mutation screening were estimated as 95% and 75%, respectively. The specificities of HRM and dHPLC for TSC mutation screening were evaluated as 91% and 98%. In addition, results suggested our novel HRM screening protocol to be more economical. In conclusion, we successfully developed a superior approach for TSC genes mutation screening for clinical application.
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Affiliation(s)
- Tz-Shiu Tsai
- Department of Medical Biotechnology and Laboratory Science, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan, Taiwan, R.O.C
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