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Xin-Yi Z, Yang-Li D, Ling-Hui Z. Review of the phenotypes and genotypes of Bardet-Biedl syndrome from China. Front Genet 2023; 14:1247557. [PMID: 38034494 PMCID: PMC10684923 DOI: 10.3389/fgene.2023.1247557] [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: 07/15/2023] [Accepted: 10/27/2023] [Indexed: 12/02/2023] Open
Abstract
Objective: To analyze the phenotypes, genotypes, and the relationship of phenotypes and genotypes for Chinese patients with Bardet-Biedl syndrome (BBS). Methods: The Chinese Wanfang and Weipu data, and PubMed were searched up to December 2022. Patients with detailed clinical feature data were involved in the analysis. Results: A total of 153 Chinese patients, including 87 males, 53 females, and 12 unknown, were enrolled. Their ages ranged from 1.2 to 44 years old with a mean of 16.70 ± 9.90 years old. Among these patients, 80 (52.29%) were reported by ophthalmologists, and only 24 (15.68%) reported by pediatricians. Most patients (132/137, 96.35%) had visual problems; 131/153 (85.62%) had polydactyly; 124/132 (93.93%) were overweight or obese; 63/114 (55.26%) had renal abnormalities; kidney dysfunction was found in 33 (21.57%); 83/104 (79.81%) had hypogonadism and/or genital hypoplasia; and 111/136 (81.62%) had mental retardation. In this series, genetic analysis was performed in 90 (58.82%) patients, including 22 BBS7 (24.71%), 20 BBS2 (22.73%), and 10 BBS10 (11.24%) patients. Moreover, 11 fetuses were diagnosed prenatally in the last 4 years except for one patient in 2004 year. It was noted that BBS7 had higher penetrance. BBS2 had higher hearing impairment and lower renal abnormality penetrance. BBS10 also had lower renal abnormality penetrance as well. Conclusion: Misdiagnosis or miss diagnosis of BBS may be common in China. In patients with polydactyly, visual impairment, obesity, renal abnormalities, hypogonadism, and mental retardation, or in fetuses with polydactyly and/or renal abnormalities, BBS should be considered in the differential diagnosis. Other deformities should be evaluated carefully and genetic analysis should be performed as early as possible.
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Affiliation(s)
- Zou Xin-Yi
- Department of Clinical Medicine, Medical School of Hangzhou City University, Hangzhou, China
| | - Dai Yang-Li
- Department of Endocrinology, The Children’s Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Zeng Ling-Hui
- Department of Clinical Medicine, Medical School of Hangzhou City University, Hangzhou, China
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Tao T, Liu J, Wang B, Pang J, Li X, Huang L. Novel mutations in BBS genes and clinical characterization of Chinese families with Bardet-Biedl syndrome. Eur J Ophthalmol 2022; 33:11206721221136324. [PMID: 36325687 DOI: 10.1177/11206721221136324] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
PURPOSE Bardet-Biedl syndrome (BBS) is a rare autosomal-recessive inherited disorder characterized by multisystem anomalies. The objective of this study was to detect and analyse pathogenic variants in four Chinese families with BBS. METHODS Comprehensive clinical examinations were performed to investigate and evaluate the phenotypes of the affected individuals from four families. Genomic DNA was extracted from peripheral blood. Next-generation sequencing (NGS) was performed for four families, and the presence of pathogenic variants was confirmed via Sanger sequencing. RESULTS There were two males and three females with a mean age of 16.00 years. All probands displayed the primary clinical features of BBS. Mutation screening demonstrated four novel mutations: c.613C>T; p.Q205* in the BBS5 gene, c.1391C>G; p.S464* in the BBS10 gene, and c.155delC; p.S52* and c.1584T>G; p.Y528* in the BBS12 gene. Two previously reported mutations were also identified, including c.534 + 1G>T in the BBS2 gene and c.539G>A; p.G180E in the BBS10 gene. The bioinformatic analysis revealed that all the detected mutations in BBS genes were disease causing. CONCLUSIONS This study identified four novel BBS gene mutations in these Chinese families and further expanded the genotypic spectrum of BBS, thus contributing to the literature and understanding of this multisystem disease.
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Affiliation(s)
- Tianchang Tao
- Department of Ophthalmology, 71185Peking University People's Hospital, Eye Diseases and Optometry Institute, Beijing, China
- Department of Ophthalmology, Peking University People's Hospital, Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing, China
- College of Optometry, Peking University Health Science Center, Beijing, China
| | - Jia Liu
- Department of Ophthalmology, 71185Peking University People's Hospital, Eye Diseases and Optometry Institute, Beijing, China
- Department of Ophthalmology, Peking University People's Hospital, Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing, China
- College of Optometry, Peking University Health Science Center, Beijing, China
| | - Bin Wang
- Eye Research Institute, 599608Xiamen Eye Center of Xiamen University, Xiamen, China
| | - Jijing Pang
- Eye Research Institute, 599608Xiamen Eye Center of Xiamen University, Xiamen, China
| | - Xiaoxin Li
- Department of Ophthalmology, 71185Peking University People's Hospital, Eye Diseases and Optometry Institute, Beijing, China
- Department of Ophthalmology, Peking University People's Hospital, Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing, China
- College of Optometry, Peking University Health Science Center, Beijing, China
- Eye Research Institute, 599608Xiamen Eye Center of Xiamen University, Xiamen, China
| | - Lvzhen Huang
- Department of Ophthalmology, 71185Peking University People's Hospital, Eye Diseases and Optometry Institute, Beijing, China
- Department of Ophthalmology, Peking University People's Hospital, Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing, China
- College of Optometry, Peking University Health Science Center, Beijing, China
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Meng X, Long Y, Ren J, Wang G, Yin X, Li S. Ocular Characteristics of Patients With Bardet-Biedl Syndrome Caused by Pathogenic BBS Gene Variation in a Chinese Cohort. Front Cell Dev Biol 2021; 9:635216. [PMID: 33777945 PMCID: PMC7991091 DOI: 10.3389/fcell.2021.635216] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 02/08/2021] [Indexed: 12/29/2022] Open
Abstract
Bardet–Biedl syndrome (BBS; OMIM 209900) is a rare genetic disease causing damage to multiple organs and affecting patients’ quality of life in late adolescence or early adulthood. In this study, the ocular characteristics including morphology and function, were analyzed in 12 BBS patients from 10 Chinese families by molecular diagnostics. A total of five known and twelve novel variants in four BBS genes (BBS2, 58.33%; BBS4, 8.33%; BBS7, 16.67%; and BBS9, 16.67%) were identified in 10 Chinese families with BBS. All patients had typical phenotypes of retinitis pigmentosa with unrecordable or severely damaged cone and rod responses on full-field flash electroretinography (ffERG). Most of the patients showed unremarkable reactions in pattern visual evoked potential (PVEP) and multifocal electroretinography (mfERG), while their flash visual evoked potentials (FVEP) indicated display residual visual function. Changes in the fundus morphology, including color fundus photography and autofluorescence (AF) imaging, were heterogeneous and not consistent with the patients’ functional tests. Overall, our study expands the variation spectrum of the BBS gene, showing that the ocular characteristics of BBS patients are clinically highly heterogeneous, and demonstrates the usefulness of a combination of the ffERG and FVEP assessments of visual function in the advanced stage of retinopathy in BBS.
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Affiliation(s)
- Xiaohong Meng
- Department of Ophthalmology, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China.,Key Laboratory of Visual Damage and Regeneration and Restoration of Chongqing, Chongqing, China
| | - Yanling Long
- Department of Ophthalmology, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China.,Key Laboratory of Visual Damage and Regeneration and Restoration of Chongqing, Chongqing, China
| | - Jiayun Ren
- Department of Ophthalmology, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China.,Key Laboratory of Visual Damage and Regeneration and Restoration of Chongqing, Chongqing, China
| | - Gang Wang
- Department of Ophthalmology, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China.,Key Laboratory of Visual Damage and Regeneration and Restoration of Chongqing, Chongqing, China
| | - Xin Yin
- Department of Ophthalmology, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China.,Key Laboratory of Visual Damage and Regeneration and Restoration of Chongqing, Chongqing, China
| | - Shiying Li
- Department of Ophthalmology, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, China.,Key Laboratory of Visual Damage and Regeneration and Restoration of Chongqing, Chongqing, China
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Shen T, Gao JM, Shou T, Li L, Zhang JP, Zhao Q, Yan XM. Identification of a homozygous BBS7 frameshift mutation in two (related) Chinese Miao families with Bardet-Biedl Syndrome. J Chin Med Assoc 2019; 82:110-114. [PMID: 30839500 DOI: 10.1097/jcma.0000000000000011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Bardet-Biedl Syndrome (BBS) is a genetically heterogeneous autosomal recessive disorder with a wide spectrum of clinical features. To date, mutations in 21 different genes (BBS1-21) have been identified as causing isolated or complex BBS phenotypes. In this report, we present three Chinese Miao ethnic patients who were diagnosed with BBS on the basis of characteristic clinical features and investigated the exsome of these patients. METHODS To evaluate disease genes, the Agilent SureSelect system and Illumina HiSeq 2000 platform for whole exome enrichment and sequencing (WES) were used on the proband and her mother. Variants that fit a recessive model of inheritance only were compared and filtered using public databases. Variants detected by exome sequencing were validated by Sanger sequencing. A total of 981 phenotypically normal subjects were enrolled as control data set. RESULTS A frameshift homozygous germline mutation in BBS7 was detected by WES and identified by Sanger sequencing in affected individuals. This mutation was predicted to result in premature termination of exon5 (c.389_390delAC, p.Asn130ThrfsX3; RefSeq NM_176824.2) and lead to a 133 amino acid truncated protein. The inheritance patterns in the families are consistent with autosomal recessive inheritance, and no such homozygous mutation was found in the other 981 controls. CONCLUSION This mutation has not yet been described in any reported literature, and this is the first report on BBS7 mutation in Chinese Miao families with BBS phenotypes.
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Affiliation(s)
- Tao Shen
- Institute of Basic and Clinical Medicine, Key laboratory of Clinical Virology, Key Laboratory for Birth Defects and Genetic Diseases, the First People's Hospital of Yunnan Province, Kunming, Yunnan Province, China
| | - Jian-Mei Gao
- Institute of Basic and Clinical Medicine, Key laboratory of Clinical Virology, Key Laboratory for Birth Defects and Genetic Diseases, the First People's Hospital of Yunnan Province, Kunming, Yunnan Province, China
| | - Tao Shou
- Oncology Department, the First People's Hospital of Yunnan Province, Kunming, Yunnan Province, China
| | - Li Li
- Institute of Basic and Clinical Medicine, Key laboratory of Clinical Virology, Key Laboratory for Birth Defects and Genetic Diseases, the First People's Hospital of Yunnan Province, Kunming, Yunnan Province, China
| | - Jin-Ping Zhang
- Institute of Basic and Clinical Medicine, Key laboratory of Clinical Virology, Key Laboratory for Birth Defects and Genetic Diseases, the First People's Hospital of Yunnan Province, Kunming, Yunnan Province, China
| | - Qian Zhao
- Institute of Basic and Clinical Medicine, Key laboratory of Clinical Virology, Key Laboratory for Birth Defects and Genetic Diseases, the First People's Hospital of Yunnan Province, Kunming, Yunnan Province, China
| | - Xin-Min Yan
- Institute of Basic and Clinical Medicine, Key laboratory of Clinical Virology, Key Laboratory for Birth Defects and Genetic Diseases, the First People's Hospital of Yunnan Province, Kunming, Yunnan Province, China
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Iannello S, Bosco P, Cavaleri A, Camuto M, Milazzo P, Belfiore F. A review of the literature of Bardet-Biedl disease and report of three cases associated with metabolic syndrome and diagnosed after the age of fifty. Obes Rev 2002; 3:123-35. [PMID: 12120419 DOI: 10.1046/j.1467-789x.2002.00055.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Bardet-Biedl syndrome (BBS) is a genetic autosomal-recessive disease (formerly grouped with Laurence-Moon-Biedl syndrome but considered today as a separate entity) characterized by abdominal obesity, mental retardation, dysphormic extremities (syndactyly, brachydactyly or polydactyly), retinal dystrophy or pigmentary retinopathy, hypogonadism or hypogenitalism (limited to male patients) and kidney structural abnormalities or functional impairment. The expression and severity of the various clinical BBS features show inter- and intrafamilial variability. This study focuses on three cases of familial BBS--two sisters and one brother (66, 64 and 51 years of age, respectively)--with the main cardinal findings of the disease plus a classic 'metabolic syndrome' (characterized by abdominal obesity, atherogenic dyslipidaemia, raised blood pressure, insulin resistance with or without glucose intolerance, and prothrombotic risk and proinflammatory states). One female patient (not affected by reproductive dysfunction) had three healthy offspring, while the other two patients were unmarried. Another severely affected brother died at 70 years of age; two other brothers are lean but affected by nephropathy, retinopathy, slight mental retardation, polydactyly, hypertension and thrombotic diseases, and had healthy offspring. BBS is a rather rare but severe syndrome that is often mis- or undiagnosed. Ophthalmologists, endocrinologists and nephrologists should be aware of BBS because of its adverse prognosis--early onset of blindness, associated findings of metabolic syndrome and increased vascular risk, and severe renal impairment (the most frequent cause of reduced survival and death early in life).
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Affiliation(s)
- S Iannello
- Department of Medicina Interna e Patologie Sistemiche, University of Catania Medical School, Garibaldi Hospital, Catania, Italy
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