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Tan X, Liu B, Yan T, Wei X, Qin Y, Zeng D, Yuan D. Prenatal diagnosis of paternal uniparental disomy for chromosome 2 in two fetuses with intrauterine growth restriction. Mol Cytogenet 2023; 16:20. [PMID: 37612666 PMCID: PMC10464012 DOI: 10.1186/s13039-023-00647-z] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 06/20/2023] [Indexed: 08/25/2023] Open
Abstract
Uniparental disomy (UPD) is when all or part of the homologous chromosomes are inherited from only one of the two parents. Currently, UPD has been reported to occur for almost all chromosomes. In this study, we report two cases of UPD for chromosome 2 (UPD2) encountered during prenatal diagnosis. The ultrasound findings of the fetuses from two unrelated families showed intrauterine growth restriction. The karyotype analyses were normal. The two fetuses both had complete paternal chromosome 2 uniparental disomy detected by whole-exome sequencing, but their clinical outcomes were significantly different, with fetal arrest in case 1 and birth in case 2. In this report, we analyzed and discussed the phenotypes of the fetuses in these two cases and reviewed the literature on UPD2.
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Affiliation(s)
- Xuemei Tan
- Department of Medical Genetics, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, China
- Liuzhou Key Laboratory of Birth Defects Prevention and Control, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, China
- Liuzhou Key Laboratory of Thalassemia Prevention and Control, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, China
- Department of Medical Genetics, Liuzhou Hospital of Guangzhou Women and Children's Medical Center, Liuzhou, China
| | - Bailing Liu
- Department of Perinatal Health, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, China
| | - Tizhen Yan
- Department of Prenatal Diagnosis Center, Dongguan Maternal and Child Health Hospital, Dongguan, China.
| | - Xiaobao Wei
- Department of Medical Genetics, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, China
- Liuzhou Key Laboratory of Birth Defects Prevention and Control, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, China
- Liuzhou Key Laboratory of Thalassemia Prevention and Control, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, China
| | - Yanfeng Qin
- Department of Perinatal Health, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, China
| | - Dingyuan Zeng
- Department of Gynecology, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, China
| | - Dejian Yuan
- Department of Medical Genetics, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, China.
- Liuzhou Key Laboratory of Birth Defects Prevention and Control, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, China.
- Liuzhou Key Laboratory of Thalassemia Prevention and Control, Liuzhou Municipal Maternity and Child Healthcare Hospital, Liuzhou, China.
- Department of Medical Genetics, Liuzhou Hospital of Guangzhou Women and Children's Medical Center, Liuzhou, China.
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Wang Y, Yu D, Wei W, Zheng H, Liu MH, Ma L, Qin LN, Wang NZ, Li JX, Wang JJ, Bi XL, Yan HL. First case report of complete paternal isodisomy of chromosome 10 harbouring a novel variant in COL17A1 that causes junctional epidermolysis bullosa intermediate. BMC Med Genomics 2022; 15:136. [PMID: 35717189 PMCID: PMC9206295 DOI: 10.1186/s12920-022-01285-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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Accepted: 06/10/2022] [Indexed: 11/29/2022] Open
Abstract
Background Uniparental disomy (UPD) is a condition in which both chromosomes are inherited from the same parent, except for imprinting disorders. Uniparental isodisomy (UPiD) may result in a homozygous variant contributing to an autosomal recessive disorder in the offspring of a heterozygous carrier. Junctional epidermolysis bullosa intermediate (JEB intermediate) is an autosomal recessive inherited disease that is associated with a series of gene variants, including those of COL17A1. Case presentation We report the first case of complete paternal UPiD of chromosome 10 harbouring a novel homozygous variant in COL17A1: c.1880(exon23)delG (p.G627Afs*56). This variant led to the clinical phenotype of junctional epidermolysis bullosa intermediate in a 5-year-old child. Trio-whole exome sequencing (Trio-WES) and in silico data analysis were used for variant identification, Sanger sequencing was performed for variant validation, and pathological examination was performed as the gold standard for phenotype confirmation. Conclusions We recommend the use of WES as a first-tier test for the diagnosis of epidermolysis bullosa, especially for paediatric patients. Moreover, UPD events should be detected and analysed routinely through WES data in the future. Supplementary Information The online version contains supplementary material available at 10.1186/s12920-022-01285-x.
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Affiliation(s)
- Yao Wang
- Center for Reproductive Medicine, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Dong Yu
- Institute of Translational Medicine, Naval Medical University, Shanghai, China
| | - Wei Wei
- Clinical Research Center, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Hao Zheng
- Center for Reproductive Medicine, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Ming-Hua Liu
- Center for Reproductive Medicine, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Long Ma
- Center for Reproductive Medicine, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Li-Na Qin
- Center for Reproductive Medicine, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Neng-Zhuang Wang
- Center for Reproductive Medicine, Changhai Hospital, Naval Medical University, Shanghai, China
| | - Jia-Xi Li
- Department of Oncology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jin-Jiang Wang
- Department of Oncology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xin-Ling Bi
- Department of Dermatology, Changhai Hospital, Naval Medical University, Shanghai, China.
| | - Hong-Li Yan
- Center for Reproductive Medicine, Changhai Hospital, Naval Medical University, Shanghai, China.
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Lu MY, Wang WC, Hou TC, Kuo CY, Lai YC. Methylation Statuses of H19DMR and KvDMR at WT2 in Wilms Tumors in Taiwan. Pathol Oncol Res 2020; 26:2153-9. [PMID: 32157637 DOI: 10.1007/s12253-020-00802-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 03/04/2020] [Indexed: 12/12/2022]
Abstract
Wilms tumor is the most common pediatric renal malignancy. Several genetic loci have been shown to be associated with its formation. Genetic or epigenetic aberrations at WT1 and WT2 loci have been implicated in the etiology of the majority of sporadic Wilms tumors. In our previous study, most Wilms tumors tested negative for both constitutional mutations and somatic mutations in the WT1 gene. Thus, WT2 may play an important role in these tumors. In the present study, we analyzed the methylation statuses of WT2 at 11p15 using methylation sensitive multiplex ligation-dependent probe amplification in six Wilms tumors. Paternal uniparental disomy at WT2 was observed in two Wilms tumors with epithelial components due to hypermethylation at H19DMR and hypomethylation at KvDMR. Our findings highlight the benefits of testing for 11p15 epigenetic abnormalities to identify Wilms tumors with epithelial components.
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Bramswig NC, Buiting K, Bechtel N, Horsthemke B, Rostasy K, Wieczorek D. Angelman Syndrome-Affected Individual with a Numerically Normal Karyotype and Isodisomic Paternal Uniparental Disomy of Chromosome 15 due to Maternal Robertsonian Translocation (14;15) by Monosomy Rescue. Cytogenet Genome Res 2018; 156:9-13. [PMID: 30016768 DOI: 10.1159/000490838] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/13/2018] [Indexed: 11/19/2022] Open
Abstract
Angelman syndrome (AS) is a neurodevelopmental disorder caused by deletion of the maternally inherited 15q11q13 region, paternal uniparental disomy 15 [upd(15)pat], an imprinting defect of the maternal chromosome region 15q11q13, or a pathogenic mutation of the maternal UBE3A allele. Predisposing factors for upd(15)pat, such as nonhomologous robertsonian translocation involving chromosome 15, have been discussed, but no evidence for this predisposition has been published. In the present study, chromosomal analysis was performed in a child with AS, both parents, and the maternal grandparents. Methylation-specific multiplex ligation-dependent probe amplification (MS-MLPA) was employed on DNA of the index individual, and microsatellite analysis was carried out on DNA of the index individual and his parents. The cytogenetic analysis showed that the mother and maternal grandfather are carriers of a rob(14;15). The index individual has a numerically normal karyotype, but MS-MLPA and microsatellite analyses confirmed the clinical diagnosis of AS and revealed a pattern highly suggestive of isodisomic upd(15)pat. This is the first report of an AS-affected individual with isodisomic upd(15)pat and a numerically normal karyotype that most likely results from a rob(14;15)-associated meiotic error in the maternal germline followed by monosomy 15 rescue in the early embryo.
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