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Liu Z, Jiang Y, Fang F, Li R, Han J, Yang X, Deng Q, Li LS, Lei TY, Li DZ, Liao C. ASXL3 gene mutations inhibit cell proliferation and promote cell apoptosis in mouse cardiomyocytes by upregulating lncRNA NONMMUT063967.2. Biochem Biophys Rep 2023; 35:101505. [PMID: 37435360 PMCID: PMC10331400 DOI: 10.1016/j.bbrep.2023.101505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 06/07/2023] [Accepted: 06/23/2023] [Indexed: 07/13/2023] Open
Abstract
Congenital heart disease (CHD) is a serious condition with unknown etiology. In a recent study, a compound heterozygous mutation (c.3526C > T [p.Arg1176Trp] and c.4643A > G [p.Asp1548Gly]) in the ASXL3 gene was identified, which is associated with CHD. This mutation was overexpressed in HL-1 mouse cardiomyocyte cells, leading to increased cell apoptosis and decreased cell proliferation. However, whether this effect is mediated by long noncoding RNAs (lncRNAs) is yet to be determined. We identified the differences among lncRNA and mRNA profiles in mouse heart tissues using sequencing to explore this issue. We detected HL-1 cell proliferation and apoptosis through CCK8 and flow cytometry. Fgfr2, lncRNA, and Ras/ERK signaling pathway expressions were evaluated using quantitative real time polymerase chain reaction (qRT-PCR) and western blot (WB) assays. We also conducted functional investigations by silencing lncRNA NONMMUT063967.2. The sequencing revealed significant changes in lncRNA and mRNA profiles, with the expression of lncRNA NONMMUT063967.2 being significantly promoted in the ASXL3 gene mutations group (MT) while the expression of Fgfr2 being downregulated. The in vitro experiments showed that ASXL3 gene mutations inhibited the proliferation of cardiomyocytes and accelerated cell apoptosis by promoting the expression of lncRNAs (NONMMUT063967.2, NONMMUT063918.2, and NONMMUT063891.2), suppressing the formation of FGFR2 transcripts, and inhibiting the Ras/ERK signaling pathway. The decrease in FGFR2 had the same effect on the Ras/ERK signaling pathway, proliferation, and apoptosis in mouse cardiomyocytes as ASXL3 mutations. Further mechanistic studies revealed that suppression of lncRNA NONMMUT063967.2 and overexpression of FGFR2 reversed the effects of the ASXL3 mutations on the Ras/ERK signaling pathway, proliferation, and apoptosis in mouse cardiomyocytes. Therefore, ASXL3 mutation decreases FGFR2 expression by upregulating lncRNA NONMMUT063967.2, inhibiting cell proliferation and promoting cell apoptosis in mouse cardiomyocytes.
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Affiliation(s)
- Zequn Liu
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Yanmin Jiang
- Institute of Obstetrics and Gynecology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Fu Fang
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Ru Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Jin Han
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Xin Yang
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Qiong Deng
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Lu-Shan Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Ting-ying Lei
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Dong-Zhi Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Can Liao
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
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Wang Q, Zhang J, Jiang N, Xie J, Yang J, Zhao X. De novo nonsense variant in ASXL3 in a Chinese girl causing Bainbridge-Ropers syndrome: A case report and review of literature. Mol Genet Genomic Med 2022; 10:e1924. [PMID: 35276034 PMCID: PMC9034677 DOI: 10.1002/mgg3.1924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 02/18/2022] [Accepted: 02/28/2022] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Bainbridge-Ropers syndrome (BRPS, OMIM #615485) was first identified in 2013 by Bainbridge et al. and is a neurodevelopment disorder characterized by failure to thrive, facial dysmorphism and severe developmental delay. BRPS is caused by heterozygous loss-of-function (LOF) variants in the additional sex combs-like 3 (ASXL3) gene. Due to the limited specific recognizable features and overlapping symptoms with Bohring-Opitz syndrome (BOS, OMIM #612990), clinical diagnosis of BRPS is challenging. METHODS In this study, a 2-year-8-month-old Chinese girl was referred for genetic evaluation of severe developmental delay. The reduced fetal movement was found during the antenatal period and bilateral varus deformity of feet was observed at birth. Whole-exome sequencing and Sanger sequencing were used to detect and confirm the variant. RESULTS A novel nonsense variant c.1063G>T (p.E355*) in the ASXL3 gene (NM_030632.3) was identified in the proband and the clinical symptoms were compatible with BRPS. The parents were physical and genetic normal and prenatal diagnosis was requested for her pregnant mother with a negative Sanger sequencing result. CONCLUSION The study revealed a de novo LOF variant in the ASXL3 gene and expanded the mutation spectrum for this clinical condition. By performing a literature review, we summarized genetic results and the clinical phenotypes of all BPRSs reported so far. More cases study may help to elucidate the function of the ASXL3 gene may be critical to understand the genetic aetiology of this syndrome and assist in accurate genetic counselling, informed decision making and prenatal diagnosis.
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Affiliation(s)
- Qin Wang
- Affiliated Shenzhen Maternity & Child Healthcare HospitalSouthern Medical UniversityShenzhenChina
| | - Jianming Zhang
- Affiliated Shenzhen Maternity & Child Healthcare HospitalSouthern Medical UniversityShenzhenChina
| | - Nan Jiang
- Affiliated Shenzhen Maternity & Child Healthcare HospitalSouthern Medical UniversityShenzhenChina
| | - Jiansheng Xie
- Affiliated Shenzhen Maternity & Child Healthcare HospitalSouthern Medical UniversityShenzhenChina
- The University of Hong Kong‐Shenzhen Hospital ShenzhenShenzhenChina
| | - Jingxin Yang
- Affiliated Shenzhen Maternity & Child Healthcare HospitalSouthern Medical UniversityShenzhenChina
| | - Xiaoshan Zhao
- Affiliated Shenzhen Maternity & Child Healthcare HospitalSouthern Medical UniversityShenzhenChina
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Liu ZQ, Cheng M, Fu F, Li R, Han J, Yang X, Deng Q, Li LS, Lei TY, Li DZ, Liao C. Identification of differential microRNAs and messenger RNAs resulting from ASXL transcriptional regulator 3 knockdown during during heart development. Bioengineered 2022; 13:9948-9961. [PMID: 35435106 PMCID: PMC9161854 DOI: 10.1080/21655979.2022.2062525] [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: 01/11/2022] [Revised: 03/25/2022] [Accepted: 03/30/2022] [Indexed: 11/30/2022] Open
Abstract
Congenital heart disease (CHD) is the most common birth defect. Although ASXL transcriptional regulator 3 (ASXL3) has been reported to cause hereditary CHD, ASXL3-mediated mechanisms in heart development remain unclear. In this study, we used dimethyl sulfoxide (DMSO) to induce differentiation in P19 cells, observed cell morphology using light microscopy after ASXL3 knockdown, and determined the levels of associated myocardial cell markers using reverse transcription-quantitative polymerase chain reaction and western blotting. Subsequently, we used microRNA sequencing, messenger RNA (mRNA) sequencing, and bioinformatics to initially identify the possible mechanisms through which ASXL3-related microRNAs and mRNAs affect heart development. The results indicated that DMSO induced P19 cell differentiation, which could be inhibited by ASXL3 knockdown. We screened 1214 and 1652 differentially expressed microRNAs and mRNAs, respectively, through ASXL3 knockdown and sequencing; these differentially expressed miRNAs were largely enriched in PI3K-Akt, mitogen-activated protein kinase, and Rap1 signaling pathways. Additionally, 11 miRNAs associated with heart development were selected through a literature review. Our analysis indicated the involvement of mmu-miR-323-3p in P19 cell differentiation through the PI3K-Akt pathway. In conclusion, ASXL3 may be involved in the regulation of heart development. This comprehensive study of differentially expressed microRNAs and mRNAs through ASXL3 knockdown in P19 cells provides new insights that may aid the prevention and treatment of CHD.
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Affiliation(s)
- Ze-Qun Liu
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, GuangzhouGuangdong, China
| | - Mi Cheng
- Department of Obstetrics, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, GuangzhouGuangdong, China
| | - Fang Fu
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, GuangzhouGuangdong, China
| | - Ru Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, GuangzhouGuangdong, China
| | - Jin Han
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, GuangzhouGuangdong, China
| | - Xin Yang
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, GuangzhouGuangdong, China
| | - Qiong Deng
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, GuangzhouGuangdong, China
| | - Lu-Shan Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, GuangzhouGuangdong, China
| | - Ting-Ying Lei
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, GuangzhouGuangdong, China
| | - Dong-Zhi Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, GuangzhouGuangdong, China
| | - Can Liao
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, GuangzhouGuangdong, China
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Wu K, Cong Y. Case report : a novel ASXL3 gene variant in a Sudanese boy. BMC Pediatr 2021; 21:557. [PMID: 34886823 PMCID: PMC8655995 DOI: 10.1186/s12887-021-03038-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 11/30/2021] [Indexed: 12/04/2022] Open
Abstract
Background Bainbridge-Ropers syndrome (BRPS) [OMIM#615485] is a neurodevelopmental disorder, characterized by delayed psychomotor development with generalized hypotonia, moderate to severe intellectual disability, poor or absent speech, feeding difficulties, growth failure, dysmorphic craniofacial features and minor skeletal features. The aim of this study was to investigate the genetic etiology of a Sudanese boy with severe developmental delay, intellectual disability, and craniofacial phenotype using trio-based whole-exome sequencing. To our knowledge, no patients with ASXL3 gene variant c.3043C>T have been reported detailedly in literature. Case presentation The patient (male, 3 years 6 months) was the first born of a healthy non-consanguineous couple originating from Sudan, treated for “psychomotor retardation” for more than 8 months in Yiwu. The patient exhibited severely delayed milestones in physiological and intellectual developmental stages, language impairment, poor eye-contact, lack of subtle motions of fingers, fear of claustrophobic space, hypotonia, clinodactyly, autistic features. Peripheral blood samples were collected from the patient and his parents. Trio-based whole-exome sequencing(Trio-WES) identified a de novo heterozygous ASXL3 gene variant c.3043C>T;p.Q1015X. Sanger sequencing verified variants of this family. Conclusion Trio-WES analysis identified a de novo nonsense variant (c.3043C>T) of ASXL3 gene in a Sudanese boy. To our knowledge, the patient with this variant has not been reported previously in literature. This study presents a new case for ASXL3 gene variants, which expanded the mutational and phenotypic spectrum.
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Affiliation(s)
- Ke Wu
- Prenatal Diganosis Center, Yiwu Maternity and Child Health Care Hospital, Xinke Road C100, Yiwu, 322000, Zhejiang Province, People's Republic of China
| | - Yan Cong
- Rehabilitation Department, Yiwu Maternity and Child Health Care Hospital, Xinke Road C100, Yiwu, 322000, Zhejiang Province, People's Republic of China.
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Li JR, Huang Z, Lu Y, Ji QY, Jiang MY, Yang F. Novel mutation in the ASXL3 gene in a Chinese boy with microcephaly and speech impairment: A case report. World J Clin Cases 2020; 8:6465-6472. [PMID: 33392332 PMCID: PMC7760454 DOI: 10.12998/wjcc.v8.i24.6465] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 10/08/2020] [Accepted: 10/26/2020] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Bainbridge-Ropers syndrome (BRPS) is a severe disorder characterized by failure to thrive, facial dysmorphism, and severe developmental delay. BRPS is caused by a heterozygous loss-of-function mutation in the ASXL3 gene. Due to limited knowledge of the disease and lack of specific features, clinical diagnosis of this syndrome is challenging. With the use of trio-based whole exome sequencing, we identified a novel ASXL3 mutation in a Chinese boy with BRPS and performed a literature review.
CASE SUMMARY A 3-year-old Chinese boy was referred to our hospital due to progressive postnatal microcephaly and intellectual disability with severe speech impairment for 2 years. His other remarkable clinical features were shown as follows: Facial dysmorphism, feeding difficulties, poor growth, motor delay, and abnormal behavior. For the proband, regular laboratory tests, blood tandem mass spectrometry, urine gas chromatographic mass spectrometry, karyotype, hearing screening, and brain magnetic resonance imaging were performed, with negative results. Therefore, for the proband and his unaffected parents, trio-based whole exome sequencing and subsequent validation by Sanger sequencing were performed. A novel nonsense variant in exon 11 of the ASXL3 gene (c.1795G>T; p.E599*) was detected, present in the patient but absent from his parents. Taking into account the concordant phenotypic features of our patient with reported BRPS patients and the detected truncated variant located in the known mutational cluster region, we confirmed a diagnosis of BRPS for this proband. The rehabilitation treatment seemed to have a mild effect.
CONCLUSION In this case, a novel nonsense mutation (c.1795G>T, p.E599*) in ASXL3 gene was identified in a Chinese boy with BRPS. This finding not only contributed to better genetic counseling and prenatal diagnosis for this family but also expanded the pathogenic mutation spectrum of ASXL3 gene and provided key information for clinical diagnosis of BRPS.
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Affiliation(s)
- Jin-Rong Li
- Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
- Department of Ministry of Education, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Chengdu 610041, Sichuan Province, China
| | - Zhuo Huang
- Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - You Lu
- Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Qiao-Yun Ji
- Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Ming-Yan Jiang
- Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
- Department of Ministry of Education, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Chengdu 610041, Sichuan Province, China
| | - Fan Yang
- Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
- Department of Ministry of Education, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Chengdu 610041, Sichuan Province, China
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Fu F, Li R, Lei TY, Wang D, Yang X, Han J, Pan M, Zhen L, Li J, Li FT, Jing XY, Li DZ, Liao C. Compound heterozygous mutation of the ASXL3 gene causes autosomal recessive congenital heart disease. Hum Genet 2020; 140:333-348. [PMID: 32696347 DOI: 10.1007/s00439-020-02200-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Accepted: 06/22/2020] [Indexed: 12/26/2022]
Abstract
To explore mutations in the additional sex combs-like 3 (ASXL3) gene in two Chinese families with congenital heart disease (CHD). Whole-exome sequencing (WES) was used to reveal a novel compound heterozygous mutation in the ASXL3 gene that was associated with CHD. Sanger sequencing of a further 122 CHD patients was used to determine an additional compound heterozygous mutation in the ASXL3 gene. Cell apoptosis was examined by MTS assay and flow cytometry. The cardiac structure was identified via hematoxylin-eosin (HE), Masson's trichrome, and ultrasound scanning. RNA sequencing was performed to identify a series of differentially expressed mRNAs. The mRNA and protein expressions were identified by quantitative real-time PCR and western blotting, respectively. A compound heterozygous mutation c.2168C > G (p.Pro723Arg) and c.5449C > G (p.Pro1817Ala) in the ASXL3 gene associated with CHD was identified. Overexpression of this compound heterozygous mutation in HL-1 cells resulted in increased apoptosis and reduced cell viability. Moreover, it affected cardiac structure and fibrosis in mice. There were 126 downregulated mRNAs and 117 upregulated mRNAs between the ASXL3 compound heterozygous mutation c.2168C > G (p.Pro723Arg) and c.5449C > G (p.Pro1817Ala) mice and wild-type mice. Ezh2, Slc6a4, and Socs3, which could interact with ASXL3 through proteins, were all upregulated. Another compound heterozygous mutation c.3526C > T (p.Arg1176Trp) and c.4643A > G (p.Asp1548Gly) in the ASXL3 gene was identified by screening a further 122 patients with CHD. The ASXL3 gene is important in cardiac development and may exert this influence by affecting the expression of mRNAs associated with cell apoptosis and cell proliferation.
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Affiliation(s)
- Fang Fu
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Ru Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Ting-Ying Lei
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Dan Wang
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Xin Yang
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Jin Han
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Min Pan
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Li Zhen
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Jian Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Fa-Tao Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Xiang-Yi Jing
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Dong-Zhi Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China
| | - Can Liao
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, Guangdong, China.
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Wayhelova M, Oppelt J, Smetana J, Hladilkova E, Filkova H, Makaturova E, Nikolova P, Beharka R, Gaillyova R, Kuglik P. Novel de novo frameshift variant in the ASXL3 gene in a child with microcephaly and global developmental delay. Mol Med Rep 2019; 20:505-512. [PMID: 31180560 PMCID: PMC6579994 DOI: 10.3892/mmr.2019.10303] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Accepted: 04/09/2019] [Indexed: 01/11/2023] Open
Abstract
De novo sequence variants, including truncating and splicing variants, in the additional sex-combs like 3 gene (ASXL3) have been described as the cause of Bainbridge-Ropers syndrome (BRS). This pathology is characterized by delayed psychomotor development, severe intellectual disability, growth delay, hypotonia and facial dimorphism. The present study reports a case of a girl (born in 2013) with severe global developmental delay, central hypotonia, microcephaly and poor speech. The proband was examined using a multi-step molecular diagnostics algorithm, including karyotype and array-comparative genomic hybridization analysis, with negative results. Therefore, the proband and her unaffected parents were enrolled for a pilot study using targeted next-generation sequencing technology (NGS) with gene panel ClearSeq Inherited DiseaseXT and subsequent validation by Sanger sequencing. A novel de novo heterozygous frameshift variant in the ASXL3 gene (c.3006delT, p.R1004Efs*21), predicted to result in a premature termination codon, was identified. In conclusion, the present study demonstrated that targeted NGS using a suitable, gene-rich panel may provide a conclusive molecular genetics diagnosis in children with severe global developmental delays.
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Affiliation(s)
- Marketa Wayhelova
- Institute of Experimental Biology, Faculty of Science, Masaryk University, 611 37 Brno, Czech Republic
| | - Jan Oppelt
- CEITEC‑Central European Institute of Technology, Masaryk University, 625 00 Brno, Czech Republic
| | - Jan Smetana
- Institute of Experimental Biology, Faculty of Science, Masaryk University, 611 37 Brno, Czech Republic
| | - Eva Hladilkova
- Department of Medical Genetics, University Hospital Brno, 625 00 Brno, Czech Republic
| | - Hana Filkova
- Department of Medical Genetics, University Hospital Brno, 625 00 Brno, Czech Republic
| | - Eva Makaturova
- Department of Medical Genetics, University Hospital Brno, 625 00 Brno, Czech Republic
| | - Petra Nikolova
- Department of Medical Genetics, University Hospital Brno, 625 00 Brno, Czech Republic
| | - Rastislav Beharka
- Department of Medical Genetics, University Hospital Brno, 625 00 Brno, Czech Republic
| | - Renata Gaillyova
- Department of Medical Genetics, University Hospital Brno, 625 00 Brno, Czech Republic
| | - Petr Kuglik
- Institute of Experimental Biology, Faculty of Science, Masaryk University, 611 37 Brno, Czech Republic
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Jiang Y, Wangler MF, McGuire AL, Lupski JR, Posey JE, Khayat MM, Murdock DR, Sanchez-Pulido L, Ponting CP, Xia F, Hunter JV, Meng Q, Murugan M, Gibbs RA. The phenotypic spectrum of Xia-Gibbs syndrome. Am J Med Genet A 2018; 176:1315-1326. [PMID: 29696776 PMCID: PMC6231716 DOI: 10.1002/ajmg.a.38699] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 03/11/2018] [Accepted: 03/12/2018] [Indexed: 12/18/2022]
Abstract
Xia-Gibbs syndrome (XGS: OMIM # 615829) results from de novo truncating mutations within the AT-Hook DNA Binding Motif Containing 1 gene (AHDC1). To further define the phenotypic and molecular spectrum of this disorder, we established an XGS Registry and recruited patients from a worldwide pool of approximately 60 probands. Additional de novo truncating mutations were observed among 25 individuals, extending both the known number of mutation sites and the range of positions within the coding region that were sensitive to alteration. Detailed phenotypic examination of 20 of these patients via clinical records review and data collection from additional surveys showed a wider age range than previously described. Data from developmental milestones showed evidence for delayed speech and that males were more severely affected. Neuroimaging from six available patients showed an associated thinning of the corpus callosum and posterior fossa cysts. An increased risk of both scoliosis and seizures relative to the population burden was also observed. Data from a modified autism screening tool revealed that XGS shares significant overlap with autism spectrum disorders. These details of the phenotypic heterogeneity of XGS implicate specific genotype/phenotype correlations and suggest potential clinical management guidelines.
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Affiliation(s)
- Yunyun Jiang
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas
| | - Michael F. Wangler
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas
- Texas Children’s Hospital, Houston, Texas
| | - Amy L. McGuire
- Center for Medical Ethics and Health Policy, Baylor College of Medicine, Houston, Texas
| | - James R. Lupski
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas
- Texas Children’s Hospital, Houston, Texas
- Department of Pediatrics, Baylor College of Medicine, Houston, Texas
| | - Jennifer E. Posey
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas
| | - Michael M. Khayat
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas
| | - David R. Murdock
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas
| | - Luis Sanchez-Pulido
- Medical Research Council Human Genetics Unit, IGMM, University of Edinburgh, Edinburgh, United Kingdom
| | - Chris P. Ponting
- Medical Research Council Human Genetics Unit, IGMM, University of Edinburgh, Edinburgh, United Kingdom
| | - Fan Xia
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas
| | | | - Qingchang Meng
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas
| | - Mullai Murugan
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas
| | - Richard A. Gibbs
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas
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Novel Splicing Mutation in B3GAT3 Associated with Short Stature, GH Deficiency, Hypoglycaemia, Developmental Delay, and Multiple Congenital Anomalies. Case Rep Genet 2017; 2017:3941483. [PMID: 29318063 PMCID: PMC5727645 DOI: 10.1155/2017/3941483] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 10/31/2017] [Accepted: 11/07/2017] [Indexed: 01/26/2023] Open
Abstract
B3GAT3, encoding β-1,3-glucuronyltransferase 3, has an important role in proteoglycan biosynthesis. Homozygous B3GAT3 mutations have been associated with short stature, skeletal deformities, and congenital heart defects. We describe for the first time a novel heterozygous splice site mutation in B3GAT3 contributing to severe short stature, growth hormone (GH) deficiency, recurrent ketotic hypoglycaemia, facial dysmorphism, and congenital heart defects. A female infant, born at 34 weeks' gestation to nonconsanguineous Caucasian parents with a birth weight of 1.9 kg, was noted to have cloacal abnormality, ventricular septal defect, pulmonary stenosis, and congenital sensorineural deafness. At 4 years of age, she was diagnosed with GH deficiency due to her short stature (height < 2.5 SD). MRI of the pituitary gland revealed a small anterior pituitary. She has multiple dysmorphic features: anteverted nares, small upturned nose, hypertelorism, slight frontal bossing, short proximal bones, hypermobile joints, and downslanting palpebral fissures. Whole exome sequencing (WES) was performed on the genomic DNA from the patient and biological mother. A heterozygous mutation in B3GAT3 (c.888+262T>G) in the invariant “GT” splice donor site was identified. This variant is considered to be pathogenic as it decreases the splicing efficiency in the mRNA.
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