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Wu K, Li Z, Zhu Y, Wang X, Chen G, Hou Z, Zhang Q. Discovery of sensorineural hearing loss and ossicle deformity in a Chinese Li nationality family with spondyloepiphyseal dysplasia congenita caused by p.G504S mutation of COL2A1. BMC Med Genomics 2021; 14:170. [PMID: 34182999 PMCID: PMC8240210 DOI: 10.1186/s12920-021-01020-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 05/24/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Spondyloepiphyseal dysplasia congenita (SEDC) is an autosomal dominant chondrodysplasia characterized by disproportionate short stature, abnormal epiphyses, and flattened vertebral bodies. COL2A1 has been confirmed as the pathogenic gene. Hearing loss represents an infrequent manifestation for 25-30% of patients with SEDC. The characteristics of the hearing impairment were rarely documented. METHODS Audiological, ophthalmic, imaging examinations were conducted on the family members. The whole exome sequencing (WES) was performed to detect the candidate gene, and the Sanger sequencing was used to confirm the causative variation. RESULTS COL2A1 c.1510G>A (p.G504S), a hot spot variation, was identified as the disease-causing mutation of the Chinese Li nationality family with SEDC. This variation was co-segregated with the SEDC phenotype in the family and was absent in the 1000 Genomes Project, ESP and ExAC. Clinically, several manifestations were first demonstrated in SEDC patients caused by p.G504S, including sensorineural hearing loss, auditory ossicles deformity, retinal detachment, sacrum cracked and elbow and wrist joints deformity. Other classical SEDC manifestations such as bones and joints pain, midfacial dysplasia, disproportionate short stature, spinal deformity, thoracocyllosis, coxa arthropathy, myopia and waddling gait were also showed in the family patients. CONCLUSION We first identified the mutation p.G504S in COL2A1 gene as the pathogenesis in a Chinese Li nationality family and reported the correlation between p.G504S and atypical clinical phenotypes including sensorineural hearing loss, auditory ossicles deformity, retinal detachment, sacrum cracked and elbow and wrist joints deformity. Our findings would extend the phenotypic spectrum of SEDC and deepen clinicians' understanding of genotype-phenotype correlation of the disease.
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Affiliation(s)
- Kan Wu
- Department of Otolaryngology-Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, China
- Centre of Clinical Aerospace Medicine, School of Aerospace Medicine, Key Laboratory of Aerospace Medicine of Ministry of Education, Air Force Medical University, Xi'an, 710032, Shanxi Province, China
| | - Zhumei Li
- Department of Otolaryngology-Head and Neck Surgery, Wanning People's Hospital, Wanning, 571500, Hainan Province, China
| | - Yuhua Zhu
- Department of Otolaryngology-Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, China
| | - Xiaocheng Wang
- Centre of Clinical Aerospace Medicine, School of Aerospace Medicine, Key Laboratory of Aerospace Medicine of Ministry of Education, Air Force Medical University, Xi'an, 710032, Shanxi Province, China
| | - Guohui Chen
- Department of Otolaryngology-Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, China
| | - Zhaohui Hou
- Department of Otolaryngology-Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, China
| | - Qiujing Zhang
- Department of Otolaryngology-Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Medical School of Chinese PLA, 28 Fuxing Road, Beijing, 100853, China.
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Zheng WB, Li LJ, Zhao DC, Wang O, Jiang Y, Xia WB, Xing XP, Li M. Novel variants in COL2A1 causing rare spondyloepiphyseal dysplasia congenita. Mol Genet Genomic Med 2020; 8:e1139. [PMID: 31972903 PMCID: PMC7057085 DOI: 10.1002/mgg3.1139] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Revised: 12/29/2019] [Accepted: 01/05/2020] [Indexed: 12/13/2022] Open
Abstract
Background Spondyloepiphyseal dysplasia congenita (SEDC) is an extremely rare inherited chondrodysplasia characterized by abnormal epiphyses, short stature, and flattened vertebral bodies. We investigate the phenotypes and the disease‐associated variants of SEDC in two unrelated Chinese families. Methods We identified disease‐associated variants in two nonconsanguineous families with SEDC using targeted next‐generation sequencing and confirmed the variants using Sanger sequencing. We investigated the phenotypes of the patients, including clinical manifestations, bone turnover biomarkers, bone mineral density and skeletal radiographic features. Results Two probands were diagnosed as SEDC according to the phenotypes of disproportionately short‐trunk stature, kyphosis, lumbar lordosis and adduction deformity of hips. Radiographs revealed kyphosis and lumbar lordosis, flattened vertebral bodies, compressed femoral heads and shortening of the femurs. Bone mineral density of the probands was lower than that of age‐ and gender‐matched normal children, but bone turnover biomarker levels were within normal range. Two novel heterozygous missense variants (NM_001844.5: c.1654 G>A, NP_001835.3: p.Gly552Arg; NM_001844.5: c.3518G>T, NP_001835.3: p.Gly1173Val) in collagen type II alpha 1 chain (COL2A1) were detected in the two families, which would impair the formation of stable triple‐helical type II collagen. Conclusions We identified two novel disease‐associated variants in COL2A1, which led to severe SEDC. Our findings expanded the gene variant spectrum and phenotypic spectrum of extremely rare type II collagenopathies.
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Affiliation(s)
- Wen-Bin Zheng
- Key Laboratory of Endocrinology, Department of Endocrinology, National Health and Family Planning Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Lu-Jiao Li
- Key Laboratory of Endocrinology, Department of Endocrinology, National Health and Family Planning Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Di-Chen Zhao
- Key Laboratory of Endocrinology, Department of Endocrinology, National Health and Family Planning Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Ou Wang
- Key Laboratory of Endocrinology, Department of Endocrinology, National Health and Family Planning Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yan Jiang
- Key Laboratory of Endocrinology, Department of Endocrinology, National Health and Family Planning Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Wei-Bo Xia
- Key Laboratory of Endocrinology, Department of Endocrinology, National Health and Family Planning Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xiao-Ping Xing
- Key Laboratory of Endocrinology, Department of Endocrinology, National Health and Family Planning Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Mei Li
- Key Laboratory of Endocrinology, Department of Endocrinology, National Health and Family Planning Commission, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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Li H, Ma L, Wang B, Cui Y, Xiao T. Identification of a novel mutation of the COL2A1 gene in a Chinese family with spondyloepiphyseal dysplasia congenita. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2015; 24:1813-9. [PMID: 25967556 DOI: 10.1007/s00586-015-3999-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 05/03/2015] [Accepted: 05/03/2015] [Indexed: 11/28/2022]
Abstract
PURPOSE To identify potential disease-causing mutation in the COL2A1 gene in a Chinese family with autosomal dominant spondyloepiphyseal dysplasia congenita (SEDC) and to analyze the phenotype-genotype correlation. METHODS Complete physical and radiographic examinations of four affected individuals from SEDC family were conducted. Genomic DNA were isolated from peripheral blood leukocytes. All 54 exons and exon-intron boundaries of the COL2A1 gene were amplified by polymerase chain reaction (PCR) and bidirectionally sequenced. RESULTS All four affected individuals were found carried a novel missense mutation of c.2224G>A (p.Gly687Ser) in COL2A1, while normal members of the family and 50 healthy controls did not have this mutation. Protein prediction of missense mutation by polyphen-2 and SIFT software and mutation taster indicated severe damage to the function. CONCLUSIONS c.2224G>A (p.Gly687Ser) is a novel mutation of COL2A1 associated with spondyloepiphyseal dysplasia congenital. There are heterozygous of phenotype for the mutation in members of the pedigree analyzed. Onset becomes more earlier and severe with each successive generation.
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Affiliation(s)
- Hongzhuo Li
- Department of Orthopedics, The Second Xiangya Hospital of Central South University, Changsha, 410011, Hunan Province, China
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Kawano O, Nakamura A, Morikawa S, Uetake K, Ishizu K, Tajima T. Spondyloepiphyseal dysplasia congenita caused by double heterozygous mutations in COL2A1. Am J Med Genet A 2015; 167:1578-81. [PMID: 25900302 DOI: 10.1002/ajmg.a.37073] [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: 11/06/2014] [Accepted: 03/06/2015] [Indexed: 11/09/2022]
Abstract
Spondyloepiphyseal dysplasia congenita (SEDC) is a group of rare inherited chondrodysplasias characterized by short stature, abnormal epiphyses, and flattened vertebral bodies. SEDC is usually caused by substitution of glycine residue with another amino acid in the triple helical domains of alpha 1 chains, which consist of type II collagen (COL2A1). Herein, we describe a unique case of SEDC with mild coxa vara (SEDC-M) caused by double de novo COL2A1 mutations located on the same allele. One mutation, p.G504S, was previously described in patients with SEDC, whereas the other, p.G612A, was a novel mutation; both were located in the triple helical domain. Neither mutation was identified in the parents and appeared to be de novo. To the best of our knowledge, this is the first study involving a patient with a type II collagenopathy with two COL2A1 mutations on the same allele. The case was characterized by a more severe phenotype compared with previously reported cases involving a single p.G504S mutation, which may have been the result of the double mutation.
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Affiliation(s)
- Osamu Kawano
- Department of Pediatrics, Obihiro Kyokai Hospital, Obihiro, Japan
| | - Akie Nakamura
- Department of Pediatrics, Hokkaido University School of Medicine, Kita-ku, Sapporo, Japan
| | - Shuntaro Morikawa
- Department of Pediatrics, Hokkaido University School of Medicine, Kita-ku, Sapporo, Japan
| | - Kimiaki Uetake
- Department of Pediatrics, Obihiro Kousei Hospital, Obihiro, Japan
| | - Katsura Ishizu
- Department of Pediatrics, Hokkaido University School of Medicine, Kita-ku, Sapporo, Japan
| | - Toshihiro Tajima
- Department of Pediatrics, Hokkaido University School of Medicine, Kita-ku, Sapporo, Japan
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Patterson SE, Dealy CN. Mechanisms and models of endoplasmic reticulum stress in chondrodysplasia. Dev Dyn 2014; 243:875-93. [DOI: 10.1002/dvdy.24131] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Revised: 03/10/2014] [Accepted: 03/17/2014] [Indexed: 12/14/2022] Open
Affiliation(s)
- Sara E. Patterson
- Center for Regenerative Medicine and Skeletal Development; Department of Reconstructive Sciences; University of Connecticut Health Center; Farmington Connecticut
| | - Caroline N. Dealy
- Center for Regenerative Medicine and Skeletal Development; Department of Reconstructive Sciences; University of Connecticut Health Center; Farmington Connecticut
- Center for Regenerative Medicine and Skeletal Development; Department of Orthopedic Surgery; University of Connecticut Health Center; Farmington Connecticut
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Xu L, Qiu X, Zhu Z, Yi L, Qiu Y. A novel mutation in COL2A1 leading to spondyloepiphyseal dysplasia congenita in a three-generation family. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2014; 23 Suppl 2:271-7. [DOI: 10.1007/s00586-014-3292-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2013] [Revised: 10/11/2013] [Accepted: 03/28/2014] [Indexed: 11/24/2022]
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Li S, Zhou H, Qin H, Guo H, Bai Y. A novel mutation in the COL2A1 gene in a Chinese family with Spondyloepiphyseal dysplasia congenita. Joint Bone Spine 2014; 81:86-9. [DOI: 10.1016/j.jbspin.2013.06.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Accepted: 06/27/2013] [Indexed: 10/26/2022]
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Neurosurgical Interventions for Spondyloepiphyseal Dysplasia Congenita: Clinical Presentation and Assessment of the Literature. World Neurosurg 2013; 80:437.e1-8. [DOI: 10.1016/j.wneu.2012.01.030] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2011] [Revised: 12/05/2011] [Accepted: 01/19/2012] [Indexed: 12/26/2022]
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Cao LH, Wang L, Ji CY, Wang LB, Ma HW, Luo Y. Novel and recurrent COL2A1 mutations in Chinese patients with spondyloepiphyseal dysplasia. GENETICS AND MOLECULAR RESEARCH 2012; 11:4130-7. [PMID: 23079993 DOI: 10.4238/2012.september.27.1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Spondyloepiphyseal dysplasia (SED) is an autosomal dominant skeletal dysplasia characterized by short stature, abnormal epiphyses and flattened vertebral bodies. SED is mainly caused by mutations in the gene encoding the type II procollagen α-1 chain (COL2A1). We looked for mutations in COL2A1 in three unrelated Chinese families with SED. Putative mutations were confirmed by RFLP analysis. We identified three missense mutations (p.G504S, p.G801S and p.G1176V) located in the triple-helical domain; p.G801S and p.G1176V are novel mutations. The p.G504S mutation has been associated with diverse phenotypes in previous studies. Our study extends the mutation spectrum of SED and confirms a relationship between mutations in the COL2A1 gene and clinical findings of SED.
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Affiliation(s)
- L H Cao
- Research Center for Medical Genomics, Key Laboratory of Cell Biology, Ministry of Public Health, Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang, China
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Esapa CT, Hough TA, Testori S, Head RA, Crane EA, Chan CPS, Evans H, Bassett JHD, Tylzanowski P, McNally EG, Carr AJ, Boyde A, Howell PGT, Clark A, Williams GR, Brown MA, Croucher PI, Nesbit MA, Brown SDM, Cox RD, Cheeseman MT, Thakker RV. A mouse model for spondyloepiphyseal dysplasia congenita with secondary osteoarthritis due to a Col2a1 mutation. J Bone Miner Res 2012; 27:413-28. [PMID: 22028304 DOI: 10.1002/jbmr.547] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Progeny of mice treated with the mutagen N-ethyl-N-nitrosourea (ENU) revealed a mouse, designated Longpockets (Lpk), with short humeri, abnormal vertebrae, and disorganized growth plates, features consistent with spondyloepiphyseal dysplasia congenita (SEDC). The Lpk phenotype was inherited as an autosomal dominant trait. Lpk/+ mice were viable and fertile and Lpk/Lpk mice died perinatally. Lpk was mapped to chromosome 15 and mutational analysis of likely candidates from the interval revealed a Col2a1 missense Ser1386Pro mutation. Transient transfection of wild-type and Ser1386Pro mutant Col2a1 c-Myc constructs in COS-7 cells and CH8 chondrocytes demonstrated abnormal processing and endoplasmic reticulum retention of the mutant protein. Histology revealed growth plate disorganization in 14-day-old Lpk/+ mice and embryonic cartilage from Lpk/+ and Lpk/Lpk mice had reduced safranin-O and type-II collagen staining in the extracellular matrix. The wild-type and Lpk/+ embryos had vertical columns of proliferating chondrocytes, whereas those in Lpk/Lpk mice were perpendicular to the direction of bone growth. Electron microscopy of cartilage from 18.5 dpc wild-type, Lpk/+, and Lpk/Lpk embryos revealed fewer and less elaborate collagen fibrils in the mutants, with enlarged vacuoles in the endoplasmic reticulum that contained amorphous inclusions. Micro-computed tomography (CT) scans of 12-week-old Lpk/+ mice revealed them to have decreased bone mineral density, and total bone volume, with erosions and osteophytes at the joints. Thus, an ENU mouse model with a Ser1386Pro mutation of the Col2a1 C-propeptide domain that results in abnormal collagen processing and phenotypic features consistent with SEDC and secondary osteoarthritis has been established.
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Affiliation(s)
- Christopher T Esapa
- Academic Endocrine Unit, Nuffield Department of Clinical Medicine, Oxford Centre for Diabetes, Endocrinology and Metabolism, University of Oxford, Churchill Hospital, Headington, Oxford, United Kingdom
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Zhang Z, He JW, Fu WZ, Zhang CQ, Zhang ZL. Identification of three novel mutations in the COL2A1 gene in four unrelated Chinese families with spondyloepiphyseal dysplasia congenita. Biochem Biophys Res Commun 2011; 413:504-8. [DOI: 10.1016/j.bbrc.2011.08.090] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Accepted: 08/18/2011] [Indexed: 11/30/2022]
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Xia XY, Cui YX, Zhou YC, Zhou X, Shi YC, Wei L, Li XJ, Huang YF, Huang TT. A novel insertion mutation in the SEDL gene results in X-linked spondyloepiphyseal dysplasia tarda in a large Chinese pedigree. Clin Chim Acta 2009; 410:39-42. [DOI: 10.1016/j.cca.2009.09.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2009] [Revised: 09/09/2009] [Accepted: 09/09/2009] [Indexed: 11/16/2022]
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Cui YX, Xia XY, Bu Y, Zhou GH, Yang B, Lu HY, Shi YC, Pan LJ, Huang YF, Li XJ. Rapid molecular prenatal diagnosis of spondyloepiphyseal dysplasia congenita by PCR-SSP assay. ACTA ACUST UNITED AC 2009; 12:533-6. [PMID: 19072565 DOI: 10.1089/gte.2008.0037] [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]
Abstract
Heterozygous mutations of COL2A1 gene are responsible for type II collagenopathies. The common skeletal phenotypes include achondrogenesis type II, hypochondrogenesis, Stickler dysplasia, Kniest dysplasia, late onset spondyloepiphyseal dysplasia, and spondyloepiphyseal dysplasia congenita (SEDC). Prevention of SEDC can be achieved by prenatal diagnosis. This study reports the first rapid molecular prenatal diagnosis of SEDC performed in China by polymerase chain reaction sequence-specific primer (PCR-SSP) analysis. The pregnant woman we previously reported with SEDC carried the G to A substitution at nucleotide 1510 in exon 23 of COL2A1 gene, which caused a change from glycine to serine at codon 504 (G504S). By the time the woman got pregnant again, she had terminated two pregnancies and still had no child. In the first pregnancy, the molecular mutation of the family was not yet identified, and therefore prenatal diagnosis was unable to be performed by DNA analysis. In the second pregnancy, G504S mutation was found from fetal DNA. At the time of her third pregnancy, the woman and her husband became extremely worried about the potential SEDC for the fetus. For this reason, a quick and reliable molecular prenatal diagnosis of SEDC was performed by a PCR-SSP on an amniocyte sample collected at the 14th week of pregnancy. No mutation of the fetal DNA was identified. The result was obtained within 24 h after the sample was collected. The technique could be applied in confirmatory diagnosis and prenatal diagnosis for the affected family.
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Affiliation(s)
- Ying-Xia Cui
- Department of Reproduction and Genetics, Jinling Hospital, Clinical School of Medical College, Nanjing University , Nanjing, P.R. China
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Menezes AH, Vogel TW. Specific entities affecting the craniocervical region: syndromes affecting the craniocervical junction. Childs Nerv Syst 2008; 24:1155-63. [PMID: 18369644 DOI: 10.1007/s00381-008-0608-6] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2008] [Indexed: 12/28/2022]
Abstract
INTRODUCTION The craniocervical junction is a vital component in understanding the function of the human central nervous system. It is the threshold for major pathways affecting both brain and spinal cord function, and these structures are intricately housed in a network of bone, ligaments, and soft tissues. Abnormal development of any of these components may lead to altered structure, and therefore, altered function in the central nervous system. MATERIALS AND METHODS We herein describe a set of genetic syndromes that commonly affect the craniovertebral junction and offer clinical examples from more than 6,000 patients who have been treated for these disorders. DISCUSSION The syndromes described include Chiari type I malformation, Conradi syndrome, Goldenhar syndrome, Klippel-Feil syndrome, Larsen syndrome, Morquio syndrome, Pierre-Robin syndrome, spondyloepiphyseal dysplasia congenital and Weaver syndrome. The genetic mechanisms responsible for these disorders may offer unique insight into the developmental pathways and patterning in the musculoskeletal and cranial systems and may, ultimately, guide future diagnosis and treatment.
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Affiliation(s)
- Arnold H Menezes
- Department of Neurosurgery, University of Iowa Hospitals and Clinics, 200 Hawkins Drive, 1824 JPP, Iowa, IA 52242, USA.
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Xia XY, Cui YX, Huang YF, Pan LJ, Yang B, Wang HY, Li XJ, Shi YC, Lu HY, Zhou YC. A novel RNA-splicing mutation in COL1A1 gene causing osteogenesis imperfecta type I in a Chinese family. Clin Chim Acta 2008; 398:148-51. [PMID: 18755172 DOI: 10.1016/j.cca.2008.07.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2008] [Revised: 07/28/2008] [Accepted: 07/31/2008] [Indexed: 10/21/2022]
Abstract
BACKGROUND Osteogenesis imperfecta (OI), also known as brittle bone disease, is a rare heterogeneous group of inherited disorders characterized by low bone mass and increased bone fragility. The four major clinical criteria for diagnosis of OI are osteoporosis with abnormal fragility of the skeleton, blue sclera, dentinogenesis imperfecta, and premature otosclerosis. The presence of two of these abnormalities confirms the diagnosis. More than 90% patients have autosomal dominant mutations in one of the two genes, COL1A1 and COL1A2, that encode the alpha chains of type I collagen. While the diagnosis of OI is still based on clinical and radiological grounds, there is a growing demand for the molecular characterization of causative mutations. Although there have been several studies on the mutational spectra of COL1A1 and/or COL1A2 in Western populations, very few cases have been reported from Asia. The purpose of this study is to report two patients with OI type I in a Chinese family, who had a novel RNA-splicing mutation in COL1A1 gene and describe the molecular, radiological and clinical findings. METHODS The proband, (case II-5), a 32-y-old Chinese male, and his 7-y-old daughter were diagnosed as OI type I according to their clinical and radiological features. Genomic DNA was extracted from their blood samples and all promoters, exons and exon/intron boundaries of COL1A1 and COL1A2 genes were sequenced. Polymerase chain reaction sequence-specific primers (PCR-SSP) was used to confirm patients' heterozygous state. RESULTS Direct DNA sequencing analysis of COL1A1 gene revealed a splicing mutation (c.1875+1G>A, also as IVS 27+1G>A) that converted the 5' end of intron 27 from GT to AT. This mutation was found in both 2 affected individuals but 9 unaffected relatives and the 50 controls were not observed, which was consistent with the clinical diagnosis. This mutation (c.1875+1G>A) appeared to be novel, which is neither reported in literature nor registered in the Database of Collagen Mutations. The heterozygous states of patients' intron 27 were confirmed by PCR-SSP. CONCLUSION We identify a novel RNA-splicing mutation (c.1875+1G>A) in COL1A1 gene resulting in OI type I in a Chinese family. The detailed molecular and clinical features will be useful for extending the evidence for genetic and phenotypic heterogeneity in OI and exploring the phenotype-genotype correlations in OI.
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Affiliation(s)
- Xin-Yi Xia
- Institute of Laboratory Medicine, Jinling Hospital, Nanjing University School of Medicine, 305 East Zhongshan Road, Nanjing 210002, PR China
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Xia XY, Cui YX, Huang YF, Pan LJ, Feng Y, Yang B, Li XJ, Zhu PY, Shi YC, Liang Q. Molecular prenatal diagnosis in 2 pregnancies at risk for spondyloepiphyseal dysplasia congenita. Clin Chim Acta 2007; 387:153-7. [PMID: 17920052 DOI: 10.1016/j.cca.2007.09.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2007] [Revised: 09/08/2007] [Accepted: 09/11/2007] [Indexed: 11/27/2022]
Abstract
BACKGROUND Spondyloepiphyseal dysplasia congenita (SEDC) is an autosomal dominant skeletal dysplasia characterized by short stature, abnormal epiphyses, and flattened vertebral bodies. Secondary prevention of SEDC can be achieved by prenatal diagnosis. Reports of antenatally-diagnosed SEDC fetuses have been very rare and molecular prenatal diagnosis even rarer. We previously reported a familial G504S mutation in the type II collagen (COL2A1) gene resulting in SEDC. In this study, molecular prenatal diagnosis was performed to 2 couples in this family with pregnancies at risk for SEDC. METHODS Amniotic fluid was sampled by amniocentesis under ultrasound guidance at 19+3 and 18+6 weeks' gestation, respectively. Karyotype and molecular genetic analysis were performed on cultured amniotic fluid cells. Maternal cell contamination was excluded by short tandem repeat (STR) analysis. Direct DNA sequencing and DHPLC were conducted to detect the potential mutation in exon 23 of COL2A1 gene. Both women underwent serial sonograms because they insisted that the molecular diagnosis should be confirmed by another method, although they had been informed that mutation analysis is predictive of the disease. RESULTS Karyotype of both fetuses was normal and molecular genetic analysis revealed that fetus 1 carried a G504S mutation in exon 23, while fetus 2 was normal. In case 1, femur length of the fetus was markedly below the 5th centile at 23 weeks' gestation, which confirms the accuracy of molecular diagnosis. A medical termination was carried out at 27+5 weeks' gestation and a male fetus with a relatively large head and short limbs was delivered. The fetal radiograph demonstrated a number of features, including generalised platyspondyly, absent ossification of the vertebral bodies in the cervical region and significant shortening of the long bones. The diagnosis of SEDC was thus confirmed clinically. Ultrasound monitoring of fetus 2 showed that its femur length was normal for gestational age at repeated scans, which was consistent with the molecular diagnosis. CONCLUSIONS Molecular analysis allows early and accurate prenatal diagnosis for SEDC once mutation is known in a family. However, considering the poor genotype/phenotype correlation in many cases of SEDC, the combination of ultrasound as well as molecular genetic approach might be needed.
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Affiliation(s)
- Xin-Yi Xia
- Institute of Laboratory Medicine, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, PR China
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