Novel MNX1 mutations and genotype–phenotype analysis of patients with Currarino syndrome
Abstract Background Currarino syndrome (CS) is a specific complex of congenital caudal anomalies, including anorectal malformations, presacral mass and sacral anomalies. Mutations in the MNX1 gene are closely related to CS and occur in almost all familial cases and less than half of sporadic patient...
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doaj-72fa081e9cb649a6850e03b08debbb702020-11-25T03:05:23ZengBMCOrphanet Journal of Rare Diseases1750-11722020-06-0115111010.1186/s13023-020-01442-4Novel MNX1 mutations and genotype–phenotype analysis of patients with Currarino syndromeLu Han0Zhen Zhang1Hui Wang2Hui Song3Qing Gao4Yuchun Yan5Ran Tao6Ping Xiao7Long Li8Qian Jiang9Qi Li10Department of Medical Genetics, Capital Institute of PediatricsDepartment of General Surgery, Capital Institute of Pediatrics Affiliated Children’s HospitalDepartment of Medical Genetics, Capital Institute of PediatricsDepartment of General Surgery, Capital Institute of Pediatrics Affiliated Children’s HospitalDepartment of General Surgery, Capital Institute of Pediatrics Affiliated Children’s HospitalDepartment of Radiology, Capital Institute of Pediatrics Affiliated Children’s HospitalDepartment of Radiology, Capital Institute of Pediatrics Affiliated Children’s HospitalDepartment of Pathology, Capital Institute of Pediatrics Affiliated Children’s HospitalDepartment of General Surgery, Capital Institute of Pediatrics Affiliated Children’s HospitalDepartment of Medical Genetics, Capital Institute of PediatricsDepartment of General Surgery, Capital Institute of Pediatrics Affiliated Children’s HospitalAbstract Background Currarino syndrome (CS) is a specific complex of congenital caudal anomalies, including anorectal malformations, presacral mass and sacral anomalies. Mutations in the MNX1 gene are closely related to CS and occur in almost all familial cases and less than half of sporadic patients. We investigated the spectrum of MNX1 pathogenic variants and associated clinical features in Chinese patients with CS. Results Seventeen index patients from 16 families were recruited from 2015 to 2018. All patients were diagnosed with CS and treated at the Capital Institute of Pediatrics Affiliated Children’s Hospital. Genetic testing was applied to identify mutations in CS patients and their relatives by whole-exome sequencing and Sanger sequencing. Functional verification was performed for a recurrent noncanonical splice site variant in MNX1 with a minigene splicing assay. In 17 CS patients, 14 were complete CS and 3 were mild CS. Nine variants in MNX1 were identified in 11 patients, and these included two frameshift mutations (p.Leu223Leufs*61, p.X402Serfs*70), four nonsense mutations (p.Gly42X, p.Cys88X, p.Gln24X, p.Cys241X), one missense mutation (p.Trp288Leu), one splice region variant (c.691 + 3G > T) and one polyalanine polymorphism (p.Ala135insAlaAla). Seven of these nine variants have never been reported. Pathogenic MNX1 mutations were found in 100% (4/4) of familial and 46% (6/13) of sporadic patients. Conclusion Our study expanded the mutation spectrum of MNX1 and provided clinical and genetic analyses of seventeen CS patients from mainland China.http://link.springer.com/article/10.1186/s13023-020-01442-4Currarino syndromeMNX1Genotype–phenotype analysisRecurrentNoncanonical splice site variant |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lu Han Zhen Zhang Hui Wang Hui Song Qing Gao Yuchun Yan Ran Tao Ping Xiao Long Li Qian Jiang Qi Li |
spellingShingle |
Lu Han Zhen Zhang Hui Wang Hui Song Qing Gao Yuchun Yan Ran Tao Ping Xiao Long Li Qian Jiang Qi Li Novel MNX1 mutations and genotype–phenotype analysis of patients with Currarino syndrome Orphanet Journal of Rare Diseases Currarino syndrome MNX1 Genotype–phenotype analysis Recurrent Noncanonical splice site variant |
author_facet |
Lu Han Zhen Zhang Hui Wang Hui Song Qing Gao Yuchun Yan Ran Tao Ping Xiao Long Li Qian Jiang Qi Li |
author_sort |
Lu Han |
title |
Novel MNX1 mutations and genotype–phenotype analysis of patients with Currarino syndrome |
title_short |
Novel MNX1 mutations and genotype–phenotype analysis of patients with Currarino syndrome |
title_full |
Novel MNX1 mutations and genotype–phenotype analysis of patients with Currarino syndrome |
title_fullStr |
Novel MNX1 mutations and genotype–phenotype analysis of patients with Currarino syndrome |
title_full_unstemmed |
Novel MNX1 mutations and genotype–phenotype analysis of patients with Currarino syndrome |
title_sort |
novel mnx1 mutations and genotype–phenotype analysis of patients with currarino syndrome |
publisher |
BMC |
series |
Orphanet Journal of Rare Diseases |
issn |
1750-1172 |
publishDate |
2020-06-01 |
description |
Abstract Background Currarino syndrome (CS) is a specific complex of congenital caudal anomalies, including anorectal malformations, presacral mass and sacral anomalies. Mutations in the MNX1 gene are closely related to CS and occur in almost all familial cases and less than half of sporadic patients. We investigated the spectrum of MNX1 pathogenic variants and associated clinical features in Chinese patients with CS. Results Seventeen index patients from 16 families were recruited from 2015 to 2018. All patients were diagnosed with CS and treated at the Capital Institute of Pediatrics Affiliated Children’s Hospital. Genetic testing was applied to identify mutations in CS patients and their relatives by whole-exome sequencing and Sanger sequencing. Functional verification was performed for a recurrent noncanonical splice site variant in MNX1 with a minigene splicing assay. In 17 CS patients, 14 were complete CS and 3 were mild CS. Nine variants in MNX1 were identified in 11 patients, and these included two frameshift mutations (p.Leu223Leufs*61, p.X402Serfs*70), four nonsense mutations (p.Gly42X, p.Cys88X, p.Gln24X, p.Cys241X), one missense mutation (p.Trp288Leu), one splice region variant (c.691 + 3G > T) and one polyalanine polymorphism (p.Ala135insAlaAla). Seven of these nine variants have never been reported. Pathogenic MNX1 mutations were found in 100% (4/4) of familial and 46% (6/13) of sporadic patients. Conclusion Our study expanded the mutation spectrum of MNX1 and provided clinical and genetic analyses of seventeen CS patients from mainland China. |
topic |
Currarino syndrome MNX1 Genotype–phenotype analysis Recurrent Noncanonical splice site variant |
url |
http://link.springer.com/article/10.1186/s13023-020-01442-4 |
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