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Wen H, Li Q, Mei S, Cai J, Huang X, Zhao J. A novel frameshift mutation in the NHS gene causes Nance-Horan syndrome in a Chinese family. Gene 2024; 907:148268. [PMID: 38350513 DOI: 10.1016/j.gene.2024.148268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 12/01/2023] [Accepted: 02/07/2024] [Indexed: 02/15/2024]
Affiliation(s)
- Huaming Wen
- Department of Ophthalmology, Chang'an Hospital of Dongguan, Dongguan 538240, Guangdong, China
| | - Qianwen Li
- Department of Oral & Maxillofacial Surgery, Shenzhen Stomatology Hospital, The Affiliated Shenzhen stomatology Hospital of Shenzhen University, Shenzhen 518000, Guangdong, China
| | - Shaoyi Mei
- Shenzhen Eye Hospital Affiliated to Jinan University, Shenzhen Eye Institute, Shenzhen 518040, Guangdong, China
| | - Jiamin Cai
- Shenzhen Eye Hospital Affiliated to Jinan University, Shenzhen Eye Institute, Shenzhen 518040, Guangdong, China
| | - Xiaosheng Huang
- Shenzhen Eye Hospital Affiliated to Jinan University, Shenzhen Eye Institute, Shenzhen 518040, Guangdong, China.
| | - Jun Zhao
- Department of Ophthalmology, Shenzhen People's Hospital (The Second Clinical Medical College, Jinan University, The First Affiliated Hospital, Southern University of Science and Technology), Shenzen 518020, Guangdong, China.
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2
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Yu X, Zhao Y, Yang Z, Chen X, Kang G. Genetic research on Nance-Horan syndrome caused by a novel mutation in the NHS gene. Gene 2024; 906:148223. [PMID: 38286268 DOI: 10.1016/j.gene.2024.148223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 01/21/2024] [Accepted: 01/26/2024] [Indexed: 01/31/2024]
Affiliation(s)
- Xuelin Yu
- Department of Ophthalmology, The Affiliated Hospital of Southwest Medical University, Luzhou 646000, China.
| | - Yueyue Zhao
- Department of Ophthalmology, The Affiliated Hospital of Southwest Medical University, Luzhou 646000, China.
| | - Zhenghua Yang
- Department of Ophthalmology, The Affiliated Hospital of Southwest Medical University, Luzhou 646000, China.
| | - Xing Chen
- Department of Ophthalmology, The Affiliated Hospital of Southwest Medical University, Luzhou 646000, China.
| | - Gangjing Kang
- Department of Ophthalmology, The Affiliated Hospital of Southwest Medical University, Luzhou 646000, China.
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Huang Y, Ma L, Zhang Z, Nie S, Zhou Y, Zhang J, Wang C, Fang X, Quan Y, He T, Liu A, Peng D. Nance-Horan syndrome pedigree due to a novel microdeletion and skewed X chromosome inactivation. Mol Genet Genomic Med 2022; 11:e2100. [PMID: 36370055 PMCID: PMC9938751 DOI: 10.1002/mgg3.2100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 08/16/2022] [Accepted: 11/03/2022] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Nance-Horan syndrome (NHS) is a rare and often overlooked X-linked dominant disorder characterized by dense congenital cataracts, dental abnormalities, and mental retardation. The majority of NHS variations include frameshift mutations, nonsense mutations, microdeletions, and insertions. METHODS Copy number variation sequencing was performed to determine the microdeletion. The expression of NHS was detected by RT-PCR. Four family members were tested for X chromosome inactivation. RESULTS In this study, all members were examined for systemic examinations and genetic testing of four members and two affected subjects are observed. We identified a heterozygous microdeletion of -0.52 Mb at Xp22.13 in a female proband presenting NHS phenotypically. The microdeletion contains the REPS2 and NHS genes and was inherited from a phenotypically normal mother. Of interest, the expression NHS of proband was reduced and the skewed X chromosome inactivation rate reached more than 85% compared with her mother and the control. It was concluded that the haploinsufficiency of the NHS gene may account for the majority of clinical symptoms in the affected subjects. The variability among female carriers presumably results from nonrandom X chromosome inactivation. CONCLUSION Our findings broaden the spectrum of NHS mutations and provide molecular insight into NHS clinical prenatal genetic diagnosis.
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Affiliation(s)
- Yazhou Huang
- Department of Medical GeneticsChangde First People's HospitalChangdeChina
| | - Linya Ma
- Department of Medical GeneticsChangde First People's HospitalChangdeChina
| | - Zhaoxia Zhang
- Department of Medical GeneticsChangde First People's HospitalChangdeChina
| | - Shujuan Nie
- Department of Medical GeneticsChangde First People's HospitalChangdeChina
| | - Yuan Zhou
- Department of Medical GeneticsChangde First People's HospitalChangdeChina
| | - Jibo Zhang
- Department of Medical GeneticsChangde First People's HospitalChangdeChina
| | - Chao Wang
- Department of Medical GeneticsChangde First People's HospitalChangdeChina
| | - Xingxin Fang
- Department of Medical GeneticsChangde First People's HospitalChangdeChina
| | - Yingting Quan
- Department of Medical GeneticsChangde First People's HospitalChangdeChina
| | - Ting He
- Department of Medical GeneticsChangde First People's HospitalChangdeChina
| | - Anhui Liu
- Affiliated Hospital of Changde CityUniversity of South ChinaHengyangChina
| | - Dan Peng
- Department of Medical GeneticsChangde First People's HospitalChangdeChina,Affiliated Hospital of Changde CityUniversity of South ChinaHengyangChina
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4
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Dave A, Craig JE, Alamein M, Skrzypiec K, Beltz J, Pfaff A, Burdon KP, Ercal N, de Iongh RU, Sharma S. Genotype, Age, Genetic Background, and Sex Influence Epha2-Related Cataract Development in Mice. Invest Ophthalmol Vis Sci 2021; 62:3. [PMID: 34495288 PMCID: PMC8431977 DOI: 10.1167/iovs.62.12.3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Purpose Age-related cataract is the leading cause of blindness worldwide. Variants in the EPHA2 gene increase the disease risk, and its knockout in mice causes cataract. We investigated whether age, sex, and genetic background, risk factors for age-related cataract, and Epha2 genotype influence Epha2-related cataract development in mice. Methods Cataract development was monitored in Epha2+/+, Epha2+/-, and Epha2-/- mice (Epha2Gt(KST085)Byg) on C57BL/6J and FVB:C57BL/6J (50:50) backgrounds. Cellular architecture of lenses, endoplasmic reticulum (ER) stress, and redox state were determined using histological, molecular, and analytical techniques. Results Epha2-/- and Epha2+/- mice on C57BL/6J background developed severe cortical cataracts by 18 and 38 weeks of age, respectively, compared to development of similar cataract significantly later in Epha2-/- mice and no cataract in Epha2+/- mice in this strain on FVB background, which was previously reported. On FVB:C57BL/6J background, Epha2-/- mice developed severe cortical cataract by 38 weeks and Epha2+/- mice exhibited mild cortical cataract up to 64 weeks of age. Progression of cataract in Epha2-/- and Epha2+/- female mice on C57BL/6J and mixed background, respectively, was slower than in matched male mice. N-cadherin and β-catenin immunolabeling showed disorganized lens fiber cells and disruption of lens architecture in Epha2-/- and Epha2+/- lenses, coinciding with development of severe cataracts. EPHA2 immunolabeling showed intracellular accumulation of the mutant EPHA2-β-galactosidase fusion protein that induced a cytoprotective ER stress response and in Epha2+/- lenses was also accompanied by glutathione redox imbalance. Conclusions Both, Epha2-/- and Epha2+/- mice develop age-related cortical cataract; age as a function of Epha2 genotype, sex, and genetic background influence Epha2-related cataractogenesis in mice.
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Affiliation(s)
- Alpana Dave
- Department of Ophthalmology, Flinders University, Bedford Park, South Australia, Australia
| | - Jamie E Craig
- Department of Ophthalmology, Flinders University, Bedford Park, South Australia, Australia
| | - Mohammad Alamein
- Department of Ophthalmology, Flinders University, Bedford Park, South Australia, Australia
| | - Karina Skrzypiec
- Department of Ophthalmology, Flinders University, Bedford Park, South Australia, Australia
| | - Justin Beltz
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri, United States
| | - Annalise Pfaff
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri, United States
| | - Kathryn P Burdon
- Department of Ophthalmology, Flinders University, Bedford Park, South Australia, Australia.,Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia
| | - Nuran Ercal
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri, United States
| | - Robb U de Iongh
- Ocular Development Laboratory, Anatomy & Neuroscience, University of Melbourne, Parkville, Australia
| | - Shiwani Sharma
- Department of Ophthalmology, Flinders University, Bedford Park, South Australia, Australia
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5
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A novel small deletion in the NHS gene associated with Nance-Horan syndrome. Sci Rep 2018; 8:2398. [PMID: 29402928 PMCID: PMC5799206 DOI: 10.1038/s41598-018-20787-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 01/24/2018] [Indexed: 11/29/2022] Open
Abstract
Nance-Horan syndrome is a rare X-linked recessive inherited disease with clinical features including severe bilateral congenital cataracts, characteristic facial and dental abnormalities. Data from Chinese Nance-Horan syndrome patients are limited. We assessed the clinical manifestations of a Chinese Nance-Horan syndrome pedigree and identified the genetic defect. Genetic analysis showed that 3 affected males carried a novel small deletion in NHS gene, c.263_266delCGTC (p.Ala89TrpfsTer106), and 2 female carriers were heterozygous for the same variant. All 3 affected males presented with typical Nance-Horan syndrome features. One female carrier displayed lens opacities centered on the posterior Y-suture in both eyes, as well as mild dental abnormalities. We recorded the clinical features of a Chinese Nance-Horan syndrome family and broadened the spectrum of mutations in the NHS gene.
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Kammoun M, Brady P, De Catte L, Deprest J, Devriendt K, Vermeesch JR. Congenital diaphragmatic hernia as a part of Nance-Horan syndrome? Eur J Hum Genet 2018; 26:359-366. [PMID: 29358614 DOI: 10.1038/s41431-017-0032-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 09/26/2017] [Accepted: 10/17/2017] [Indexed: 11/09/2022] Open
Abstract
Nance-Horan syndrome is a rare X-linked developmental disorder characterized by bilateral congenital cataract, dental anomalies, facial dysmorphism, and intellectual disability. Here, we identify a patient with Nance-Horan syndrome caused by a new nonsense NHS variant. In addition, the patient presented congenital diaphragmatic hernia. NHS gene expression in murine fetal diaphragm was demonstrated, suggesting a possible involvement of NHS in diaphragm development. Congenital diaphragmatic hernia could result from NHS loss of function in pleuroperitoneal fold or in somites-derived muscle progenitor cells leading to an impairment of their cells migration.
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Affiliation(s)
- Molka Kammoun
- Department of Human Genetics, KU Leuven, O&N I Herestraat 49, box 602, 3000, Leuven, Belgium
| | - Paul Brady
- Department of Human Genetics, KU Leuven, O&N I Herestraat 49, box 602, 3000, Leuven, Belgium
| | - Luc De Catte
- Department Obstetrics and Gynecology, University Hospital Leuven, Leuven, Belgium
| | - Jan Deprest
- Department Obstetrics and Gynecology, University Hospital Leuven, Leuven, Belgium
| | - Koenraad Devriendt
- Department of Human Genetics, KU Leuven, O&N I Herestraat 49, box 602, 3000, Leuven, Belgium
| | - Joris Robert Vermeesch
- Department of Human Genetics, KU Leuven, O&N I Herestraat 49, box 602, 3000, Leuven, Belgium.
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Gómez-Laguna L, Martínez-Herrera A, Reyes-de la Rosa ADP, García-Delgado C, Nieto-Martínez K, Fernández-Ramírez F, Valderrama-Atayupanqui TY, Morales-Jiménez AB, Villa-Morales J, Kofman S, Cervantes A, Morán-Barroso VF. Nance-Horan syndrome in females due to a balanced X;1 translocation that disrupts the NHS gene: Familial case report and review of the literature. Ophthalmic Genet 2017; 39:56-62. [PMID: 28922055 DOI: 10.1080/13816810.2017.1363245] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The Nance-Horan syndrome is an X-linked disorder characterized by congenital cataract, facial features, microcornea, microphthalmia, and dental anomalies; most of the cases are due to NHS gene mutations on Xp22.13. Heterozygous carrier females generally present less severe features, and up to 30% of the affected males have intellectual disability. We describe two patients, mother and daughter, manifesting Nance-Horan syndrome. The cytogenetic and molecular analyses demonstrated a 46,X,t(X;1)(p22.13;q22) karyotype in each of them. No copy-number genomic imbalances were detected by high-density microarray analysis. The mother had a preferential inactivation of the normal X chromosome; expression analysis did not detect any mRNA isoform of NHS. This is the first report of Nance-Horan syndrome due to a skewed X chromosome inactivation resulting from a balanced translocation t(X;1) that disrupts the NHS gene expression, with important implications for clinical presentation and genetic counseling.
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Affiliation(s)
- Laura Gómez-Laguna
- a Service of Genetics , Hospital General de México Dr. Eduardo Liceaga , Mexico City , Mexico
| | | | | | | | - Karem Nieto-Martínez
- b Faculty of Medicine , Universidad Nacional Autónoma de México (UNAM) , Mexico City , Mexico
| | | | | | | | - Judith Villa-Morales
- c Department of Genetics , Hospital Infantil de México Federico Gómez , Mexico City , Mexico
| | - Susana Kofman
- a Service of Genetics , Hospital General de México Dr. Eduardo Liceaga , Mexico City , Mexico
| | - Alicia Cervantes
- a Service of Genetics , Hospital General de México Dr. Eduardo Liceaga , Mexico City , Mexico.,b Faculty of Medicine , Universidad Nacional Autónoma de México (UNAM) , Mexico City , Mexico
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8
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Shoshany N, Avni I, Morad Y, Weiner C, Einan-Lifshitz A, Pras E. NHS Gene Mutations in Ashkenazi Jewish Families with Nance-Horan Syndrome. Curr Eye Res 2017; 42:1240-1244. [PMID: 28557584 DOI: 10.1080/02713683.2017.1304560] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
PURPOSE To describe ocular and extraocular abnormalities in two Ashkenazi Jewish families with infantile cataract and X-linked inheritance, and to identify their underlying mutations. METHODS Seven affected members were recruited. Medical history, clinical findings, and biometric measurements were recorded. Mutation analysis of the Nance-Horan syndrome (NHS) gene was performed by direct sequencing of polymerase chain reaction-amplified exons. RESULTS An unusual anterior Y-sutural cataract was documented in the affected male proband. Other clinical features among examined patients included microcorneas, long and narrow faces, and current or previous dental anomalies. A nonsense mutation was identified in each family, including a previously described 742 C>T, p.(Arg248*) mutation in Family A, and a novel mutation 2915 C>A, p.(Ser972*) in Family B. CONCLUSIONS Our study expands the repertoire of NHS mutations and the related phenotype, including newly described anterior Y-sutural cataract and dental findings.
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Affiliation(s)
- Nadav Shoshany
- a The Matlow's Ophthalmo-genetics Laboratory , Assaf-Harofeh Medical Center , Zerifin , Israel.,b Department of Ophthalmology , Assaf-Harofeh Medical Center , Zerifin , Israel
| | - Isaac Avni
- a The Matlow's Ophthalmo-genetics Laboratory , Assaf-Harofeh Medical Center , Zerifin , Israel.,b Department of Ophthalmology , Assaf-Harofeh Medical Center , Zerifin , Israel.,c Sackler Faculty of Medicine , Tel Aviv University , Tel Aviv , Israel
| | - Yair Morad
- b Department of Ophthalmology , Assaf-Harofeh Medical Center , Zerifin , Israel.,c Sackler Faculty of Medicine , Tel Aviv University , Tel Aviv , Israel
| | - Chen Weiner
- a The Matlow's Ophthalmo-genetics Laboratory , Assaf-Harofeh Medical Center , Zerifin , Israel
| | - Adi Einan-Lifshitz
- b Department of Ophthalmology , Assaf-Harofeh Medical Center , Zerifin , Israel.,c Sackler Faculty of Medicine , Tel Aviv University , Tel Aviv , Israel
| | - Eran Pras
- a The Matlow's Ophthalmo-genetics Laboratory , Assaf-Harofeh Medical Center , Zerifin , Israel.,b Department of Ophthalmology , Assaf-Harofeh Medical Center , Zerifin , Israel.,c Sackler Faculty of Medicine , Tel Aviv University , Tel Aviv , Israel
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Biological effect of LOXL1 coding variants associated with pseudoexfoliation syndrome. Exp Eye Res 2016; 146:212-223. [PMID: 26997634 DOI: 10.1016/j.exer.2016.03.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 03/01/2016] [Accepted: 03/13/2016] [Indexed: 01/08/2023]
Abstract
Pseudoexfoliation (PEX) syndrome is a systemic disease involving the extracellular matrix. It increases the risk of glaucoma, an irreversible cause of blindness, and susceptibility to heart disease, stroke and hearing loss. Single nucleotide polymorphisms (SNPs) in the LOXL1 (Lysyl oxidase-like 1) gene are the major known genetic risk factor for PEX syndrome. Two coding SNPs, rs1048861 (G > T; Arg141Leu) and rs3825942 (G > A; Gly153Asp), in the LOXL1 gene are strongly associated with the disease risk in multiple populations worldwide. In the present study, we investigated functional effects of these SNPs on the LOXL1 protein. We show through molecular modelling that positions 141 and 153 are likely surface residues and hence possible recognition sites for protein-protein interactions; the Arg141Leu and Gly153Asp substitutions cause charge changes that would lead to local differences in protein electrostatic potential and in turn the potential to modify protein-protein interactions. In RFL-6 rat fetal lung fibroblast cells ectopically expressing the LOXL1 protein variants related to PEX (Arg141_Gly153, Arg141_Asp153 or Leu141_Gly153), immunoprecipitation of the secreted variants showed differences in their processing by endogenous proteins, possibly Bone morphogenetic protein-1 (BMP-1) that cleaves and leads to enzymatic activation of LOXL1. Immunofluorescence labelling of the ectopically expressed protein variants in RFL-6 cells showed no significant difference in their extracellular accumulation tendency. In conclusion, this is the first report of a biological effect of the coding SNPs in the LOXL1 gene associated with PEX syndrome, on the LOXL1 protein. The findings indicate that the disease associated coding variants themselves may be involved in the manifestation of PEX syndrome.
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10
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Li A, Li B, Wu L, Yang L, Chen N, Ma Z. Identification of a novel NHS mutation in a Chinese family with Nance-Horan syndrome. Curr Eye Res 2014; 40:434-8. [PMID: 25266737 DOI: 10.3109/02713683.2014.959606] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE To identiy the disease causing mutation in a Chinese family presenting with early-onset cataract and dental anomalies. MATERIALS AND METHODS A specific Hereditary Eye Disease Enrichment Panel (HEDEP) (personalized customization by MyGenostics, Baltimore, MD) based on targeted exome capture technology was used to collect the protein coding regions of 30 early-onset cataract associated genes, and high throughput sequencing was done with Illumina HiSeq 2000 platform. The identified variant was confirmed with Sanger sequencing. RESULTS A novel deletion in exon 4 (c.852delG) of NHS gene was identified; the identified 1 bp deletion altered the reading frame and was predicted to result in a premature stop codon after the addition of twelve novel amino acid (p.S285PfsX13). This mutation co-segregated in affected males and obligate female carriers, but was absent in 100 matched controls. CONCLUSIONS Our findings broaden the spectrum of NHS mutations causing Nance-Horan syndrome and phenotypic spectrum of the disease in Chinese patients.
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Affiliation(s)
- Aijun Li
- Key Laboratory of Vision Loss and Restoration, Ministry of Education, Peking University Eye Center, Peking University Third Hospital , Beijing , P. R. China
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Tug E, Dilek NF, Javadiyan S, Burdon KP, Percin FE. A Turkish family with Nance-Horan Syndrome due to a novel mutation. Gene 2013; 525:141-5. [PMID: 23566852 DOI: 10.1016/j.gene.2013.03.094] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Revised: 03/14/2013] [Accepted: 03/16/2013] [Indexed: 11/26/2022]
Abstract
Nance-Horan Syndrome (NHS) is a rare X-linked syndrome characterized by congenital cataract which leads to profound vision loss, characteristic dysmorphic features and specific dental anomalies. Microcornea, microphthalmia and mild or moderate mental retardation may accompany these features. Heterozygous females often manifest similarly but with less severe features than affected males. We describe two brothers who have the NHS phenotype and their carrier mother who had microcornea but not cataract. We identified a previously unreported frameshift mutation (c.558insA) in exon 1 of the NHS gene in these patients and their mother which is predicted to result in the incorporation of 11 aberrant amino acids prior to a stop codon (p.E186Efs11X). We also discussed genotype-phenotype correlation according to relevant literature.
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Affiliation(s)
- Esra Tug
- Department of Medical Genetics, Gazi University Faculty of Medicine, Ankara, Turkey.
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12
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Laurie KJ, Dave A, Straga T, Souzeau E, Chataway T, Sykes MJ, Casey T, Teo T, Pater J, Craig JE, Sharma S, Burdon KP. Identification of a Novel Oligomerization Disrupting Mutation inCRYΑAAssociated with Congenital Cataract in a South Australian Family. Hum Mutat 2013; 34:435-8. [DOI: 10.1002/humu.22260] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2012] [Accepted: 12/05/2012] [Indexed: 11/10/2022]
Affiliation(s)
- Kate J. Laurie
- Department of Ophthalmology, Flinders Medical Centre; Flinders University; Adelaide; SA; Australia
| | - Alpana Dave
- Department of Ophthalmology, Flinders Medical Centre; Flinders University; Adelaide; SA; Australia
| | - Tania Straga
- Department of Ophthalmology, Flinders Medical Centre; Flinders University; Adelaide; SA; Australia
| | - Emmanuelle Souzeau
- Department of Ophthalmology, Flinders Medical Centre; Flinders University; Adelaide; SA; Australia
| | - Timothy Chataway
- Department of Human Physiology, Flinders Medical Centre; Flinders University; Adelaide; SA; Australia
| | - Matthew J. Sykes
- Sansom Institute for Health Research; University of South Australia; Adelaide; SA; Australia
| | - Theresa Casey
- Ophthalmology Department; Women's and Children's Hospital; Adelaide; SA; Australia
| | - Theodosia Teo
- Sansom Institute for Health Research; University of South Australia; Adelaide; SA; Australia
| | | | - Jamie E. Craig
- Department of Ophthalmology, Flinders Medical Centre; Flinders University; Adelaide; SA; Australia
| | - Shiwani Sharma
- Department of Ophthalmology, Flinders Medical Centre; Flinders University; Adelaide; SA; Australia
| | - Kathryn P. Burdon
- Department of Ophthalmology, Flinders Medical Centre; Flinders University; Adelaide; SA; Australia
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13
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Khan AO, Aldahmesh MA, Mohamed JY, Alkuraya FS. Phenotype-genotype correlation in potential female carriers of X-linked developmental cataract (Nance-Horan syndrome). Ophthalmic Genet 2012; 33:89-95. [PMID: 22229851 DOI: 10.3109/13816810.2011.634881] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE To correlate clinical examination with underlying genotype in asymptomatic females who are potential carriers of X-linked developmental cataract (Nance-Horan syndrome). METHODS An ophthalmologist blind to the pedigree performed comprehensive ophthalmic examination for 16 available family members (two affected and six asymptomatic females, five affected and three asymptomatic males). Facial features were also noted. Venous blood was collected for sequencing of the gene NHS. RESULTS All seven affected family members had congenital or infantile cataract and facial dysmorphism (long face, bulbous nose, abnormal dentition). The six asymptomatic females ranged in age from 4-35 years old. Four had posterior Y-suture centered lens opacities; these four also exhibited the facial dysmorphism of the seven affected family members. The fifth asymptomatic girl had scattered fine punctate lens opacities (not centered on the Y-suture) while the sixth had clear lenses, and neither exhibited the facial dysmorphism. A novel NHS mutation (p.Lys744AsnfsX15 [c.2232delG]) was found in the seven patients with congenital or infantile cataract. This mutation was also present in the four asymptomatic girls with Y-centered lens opacities but not in the other two asymptomatic girls or in the three asymptomatic males (who had clear lenses). CONCLUSIONS Lens opacities centered around the posterior Y-suture in the context of certain facial features were sensitive and specific clinical signs of carrier status for NHS mutation in asymptomatic females. Lens opacities that did not have this characteristic morphology in a suspected female carrier were not a carrier sign, even in the context of her affected family members.
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Affiliation(s)
- Arif O Khan
- Division of Pediatric Ophthalmology, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia.
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14
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The first missense mutation of NHS gene in a Tunisian family with clinical features of NHS syndrome including cardiac anomaly. Eur J Hum Genet 2011; 19:851-6. [PMID: 21559051 DOI: 10.1038/ejhg.2011.52] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Nance-Horan Syndrome (NHS) or X-linked cataract-dental syndrome is a disease of unknown gene action mechanism, characterized by congenital cataract, dental anomalies, dysmorphic features and, in some cases, mental retardation. We performed linkage analysis in a Tunisian family with NHS in which affected males and obligate carrier female share a common haplotype in the Xp22.32-p11.21 region that contains the NHS gene. Direct sequencing of NHS coding exons and flanking intronic sequences allowed us to identify the first missense mutation (P551S) and a reported SNP-polymorphism (L1319F) in exon 6, a reported UTR-SNP (c.7422 C>T) and a novel one (c.8239 T>A) in exon 8. Both variations P551S and c.8239 T>A segregate with NHS phenotype in this family. Although truncations, frame-shift and copy number variants have been reported in this gene, no missense mutations have been found to segregate previously. This is the first report of a missense NHS mutation causing NHS phenotype (including cardiac defects). We hypothesize also that the non-reported UTR-SNP of the exon 8 (3'-UTR) is specific to the Tunisian population.
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15
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Martinez G, de Iongh R. The lens epithelium in ocular health and disease. Int J Biochem Cell Biol 2010; 42:1945-63. [PMID: 20883819 DOI: 10.1016/j.biocel.2010.09.012] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2010] [Revised: 09/19/2010] [Accepted: 09/20/2010] [Indexed: 01/11/2023]
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Liao HM, Niu DM, Chen YJ, Fang JS, Chen SJ, Chen CH. Identification of a microdeletion at Xp22.13 in a Taiwanese family presenting with Nance-Horan syndrome. J Hum Genet 2010; 56:8-11. [PMID: 20882036 DOI: 10.1038/jhg.2010.121] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Nance-Horan syndrome (NHS) is a rare X-linked disorder characterized by congenital cataracts, dental anomalies and mental retardation. The disease has been linked to a novel gene termed NHS located at Xp22.13. The majority of pathogenic mutations of the disease include nonsense mutations and small deletions and insertions that lead to truncation of the NHS protein. In this study, we identified a microdeletion of ∼ 0.92 Mb at Xp22.13 detected by array-based comparative genomic hybridization in two brothers presenting congenital cataract, dental anomalies, facial dysmorphisms and mental retardation. The deleted region encompasses the REPS2, NHS, SCML1 and RAI2 genes, and was transmitted from their carrier mother who presented only mild cataract. Our findings are in line with several recent case reports to indicate that genomic rearrangement involving the NHS gene is an important genetic etiology underlying NHS.
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Affiliation(s)
- Hsiao-Mei Liao
- Institute of Biotechnology and Graduate Program of Biotechnology in Medicine, National Tsing-Hua University, Hsinchu, Taiwan
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Brooks SP, Coccia M, Tang HR, Kanuga N, Machesky LM, Bailly M, Cheetham ME, Hardcastle AJ. The Nance-Horan syndrome protein encodes a functional WAVE homology domain (WHD) and is important for co-ordinating actin remodelling and maintaining cell morphology. Hum Mol Genet 2010; 19:2421-32. [PMID: 20332100 PMCID: PMC2876887 DOI: 10.1093/hmg/ddq125] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Nance–Horan syndrome (NHS) is an X-linked developmental disorder, characterized by bilateral congenital cataracts, dental anomalies, facial dysmorphism and mental retardation. Null mutations in a novel gene, NHS, cause the syndrome. The NHS gene appears to have multiple isoforms as a result of alternative transcription, but a cellular function for the NHS protein has yet to be defined. We describe NHS as a founder member of a new protein family (NHS, NHSL1 and NHSL2). Here, we demonstrate that NHS is a novel regulator of actin remodelling and cell morphology. NHS localizes to sites of cell–cell contact, the leading edge of lamellipodia and focal adhesions. The N-terminus of isoforms NHS-A and NHS-1A, implicated in the pathogenesis of NHS, have a functional WAVE homology domain that interacts with the Abi protein family, haematopoietic stem/progenitor cell protein 300 (HSPC300), Nap1 and Sra1. NHS knockdown resulted in the disruption of the actin cytoskeleton. We show that NHS controls cell morphology by maintaining the integrity of the circumferential actin ring and controlling lamellipod formation. NHS knockdown led to a striking increase in cell spreading. Conversely, ectopic overexpression of NHS inhibited lamellipod formation. Remodelling of the actin cytoskeleton and localized actin polymerization into branched actin filaments at the plasma membrane are essential for mediating changes in cell shape, migration and cell contact. Our data identify NHS as a new regulator of actin remodelling. We suggest that NHS orchestrates actin regulatory protein function in response to signalling events during development.
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Affiliation(s)
- Simon P Brooks
- 1UCL Institute of Ophthalmology, 11-43 Bath Street, London EC1V 9EL, UK
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