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Yang Q, Zhang Q, Qin Z, Yi S, Luo J. A novel variant in NSUN2 causes intellectual disability in a Chinese family. BMC Med Genomics 2024; 17:95. [PMID: 38643142 PMCID: PMC11032587 DOI: 10.1186/s12920-024-01883-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Accepted: 04/17/2024] [Indexed: 04/22/2024] Open
Abstract
NSUN2-intellectual disability syndrome, also known as intellectual disability type 5 (MRT5), is an autosomal recessive disorder that is characterized by intellectual disability (ID), postnatal growth retardation, dysmorphic facies, microcephaly, short stature, developmental delay, language impairment and other congenital abnormalities. The disease is caused by mutations in the NSUN2 gene, which encodes a tRNA cytosine methyltransferase that has an important role in spindle assembly during mitosis and chromosome segregation. In this study, we recruited a family that had two individuals with ID. Whole exome sequencing was performed to identify a homozygous frameshift variant (c.1171_1175delACCAT(p.Thr391fs*18*)) in NSUN2 (NM_017755.5) in the proband. The varint was confirmed as segregating in his affected brother and his parents by Sanger sequencing. The individuals that we described showed a similar dysmorphology profile to that associated with MRT5. To analyze the correlations between genotypes of NSUN2 and phenotypes of individuals with ID, we examined 17 variants and the associated phenotypes from 32 ID individuals in current and previous studies. We concluded that mutations in NSUN2 cause a wide range of phenotypic defects. Although some clinical manifestations were highly variable, the core phenotypes associated with NSUN2 mutations were dysmorphic facies, microcephaly, short stature, ID, growth restriction, language impairment, hypotonia and delayed puberty. Our study expands the genetic spectrum of NSUN2 mutations and helps to further define the genotype-phenotype correlations in MRT5.
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Affiliation(s)
- Qi Yang
- Guangxi Key Laboratory of Birth Defects Research and Prevention, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, No. 59, Xiangzhu Road, Nanning, China
- Department of Genetic and Metabolic Central Laboratory, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, China
| | - Qiang Zhang
- Guangxi Key Laboratory of Birth Defects Research and Prevention, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, No. 59, Xiangzhu Road, Nanning, China
- Department of Genetic and Metabolic Central Laboratory, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, China
| | - Zailong Qin
- Guangxi Key Laboratory of Birth Defects Research and Prevention, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, No. 59, Xiangzhu Road, Nanning, China
- Department of Genetic and Metabolic Central Laboratory, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, China
| | - Shang Yi
- Guangxi Key Laboratory of Birth Defects Research and Prevention, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, No. 59, Xiangzhu Road, Nanning, China
- Department of Genetic and Metabolic Central Laboratory, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, China
| | - Jingsi Luo
- Guangxi Key Laboratory of Birth Defects Research and Prevention, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, No. 59, Xiangzhu Road, Nanning, China.
- Department of Genetic and Metabolic Central Laboratory, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning, China.
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Yi S, Tang X, Chen F, Wang L, Chen J, Yang Z, Huang M, Yi S, Huang L, Yang Q, Yang S, Pan P, Qin Z, Luo J. A genetic variant in the MAST1 gene is associated with mega-corpus-callosum syndrome with hypoplastic cerebellar vermis, in a fetus. Mol Genet Genomic Med 2024; 12:e2358. [PMID: 38284444 PMCID: PMC10785557 DOI: 10.1002/mgg3.2358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 12/14/2023] [Accepted: 12/26/2023] [Indexed: 01/30/2024] Open
Abstract
BACKGROUND Mega-corpus-callosum syndrome with cerebellar hypoplasia and cortical malformations is a rare neurological disorder that is associated with typical clinical and imaging features. The syndrome is caused by pathogenic variants in the MAST1 gene, which encodes a microtubule-associated protein that is predominantly expressed in postmitotic neurons in the developing nervous system. METHODS Fetal DNA from umbilical cord blood samples and genomic DNA from peripheral blood lymphocytes were subjected to whole-exome sequencing. The potential causative variants were verified by Sanger sequencing. RESULTS A 26-year-old primigravid woman was referred to our prenatal center at 25 weeks of gestation due to abnormal ultrasound findings in the brain of the fetus. The brain abnormalities included wide cavum septum pellucidum, shallow and incomplete bilateral lateral fissure cistern, bilateral dilated lateral ventricles, hyperplastic corpus callosum, lissencephaly, and cortical dysplasia. No obvious abnormalities were observed in the brainstem or cerebellum hemispheres, but the cerebellum vermis was small. Whole-exome sequencing identified a de novo, heterozygous missense variant, c.695T>C(p.Leu232Pro), in the MAST1 gene and a genetic diagnosis of mega-corpus-callosum syndrome was considered. CONCLUSION This study is the first prenatal case of MAST1-related disorder reported in the Chinese population and has expanded the mutation spectrum of the MAST1 gene.
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Affiliation(s)
- Sheng Yi
- Genetic and Metabolic Central Laboratory, Guangxi Birth Defects Research and Prevention InstituteMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
- Guangxi Clinical Research Center for Pediatric Diseases, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Guangxi Key Laboratory of Precision Medicine for Genetic Diseases, Guangxi Key Laboratory of Birth Defects and Stem Cell Biobank, Guangxi Key Laboratory of Birth Defects Research and PreventionMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
| | - Xianglian Tang
- Genetic and Metabolic Central Laboratory, Guangxi Birth Defects Research and Prevention InstituteMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
- Guangxi Clinical Research Center for Pediatric Diseases, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Guangxi Key Laboratory of Precision Medicine for Genetic Diseases, Guangxi Key Laboratory of Birth Defects and Stem Cell Biobank, Guangxi Key Laboratory of Birth Defects Research and PreventionMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
| | - Fei Chen
- Genetic and Metabolic Central Laboratory, Guangxi Birth Defects Research and Prevention InstituteMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
- Guangxi Clinical Research Center for Pediatric Diseases, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Guangxi Key Laboratory of Precision Medicine for Genetic Diseases, Guangxi Key Laboratory of Birth Defects and Stem Cell Biobank, Guangxi Key Laboratory of Birth Defects Research and PreventionMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
| | - Linlin Wang
- Department of ObstetricsMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
| | - Junjie Chen
- Department of RadiologyMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
| | - Zuojian Yang
- Department of UltrasoundMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
| | - Minpan Huang
- Genetic and Metabolic Central Laboratory, Guangxi Birth Defects Research and Prevention InstituteMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
- Guangxi Clinical Research Center for Pediatric Diseases, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Guangxi Key Laboratory of Precision Medicine for Genetic Diseases, Guangxi Key Laboratory of Birth Defects and Stem Cell Biobank, Guangxi Key Laboratory of Birth Defects Research and PreventionMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
| | - Shang Yi
- Genetic and Metabolic Central Laboratory, Guangxi Birth Defects Research and Prevention InstituteMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
- Guangxi Clinical Research Center for Pediatric Diseases, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Guangxi Key Laboratory of Precision Medicine for Genetic Diseases, Guangxi Key Laboratory of Birth Defects and Stem Cell Biobank, Guangxi Key Laboratory of Birth Defects Research and PreventionMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
| | - Limei Huang
- Genetic and Metabolic Central Laboratory, Guangxi Birth Defects Research and Prevention InstituteMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
- Guangxi Clinical Research Center for Pediatric Diseases, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Guangxi Key Laboratory of Precision Medicine for Genetic Diseases, Guangxi Key Laboratory of Birth Defects and Stem Cell Biobank, Guangxi Key Laboratory of Birth Defects Research and PreventionMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
| | - Qi Yang
- Genetic and Metabolic Central Laboratory, Guangxi Birth Defects Research and Prevention InstituteMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
- Guangxi Clinical Research Center for Pediatric Diseases, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Guangxi Key Laboratory of Precision Medicine for Genetic Diseases, Guangxi Key Laboratory of Birth Defects and Stem Cell Biobank, Guangxi Key Laboratory of Birth Defects Research and PreventionMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
| | - Shuihua Yang
- Department of UltrasoundMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
| | - Pingshan Pan
- Department of ObstetricsMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
| | - Zailong Qin
- Genetic and Metabolic Central Laboratory, Guangxi Birth Defects Research and Prevention InstituteMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
- Guangxi Clinical Research Center for Pediatric Diseases, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Guangxi Key Laboratory of Precision Medicine for Genetic Diseases, Guangxi Key Laboratory of Birth Defects and Stem Cell Biobank, Guangxi Key Laboratory of Birth Defects Research and PreventionMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
| | - Jingsi Luo
- Genetic and Metabolic Central Laboratory, Guangxi Birth Defects Research and Prevention InstituteMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
- Guangxi Clinical Research Center for Pediatric Diseases, Guangxi Key Laboratory of Reproductive Health and Birth Defects Prevention, Guangxi Key Laboratory of Precision Medicine for Genetic Diseases, Guangxi Key Laboratory of Birth Defects and Stem Cell Biobank, Guangxi Key Laboratory of Birth Defects Research and PreventionMaternal and Child Health Hospital of Guangxi Zhuang Autonomous RegionNanningChina
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