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Li YY, Tse WT, Kong CW, Wong NKL, Leung TY, Choy KW, To WWK, Cao Y. Prenatal Diagnosis and Pregnancy Outcomes of Fetuses With Orofacial Cleft: A Retrospective Cohort Study in Two Centres in Hong Kong. Cleft Palate Craniofac J 2024; 61:391-399. [PMID: 36128746 DOI: 10.1177/10556656221128436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVE To evaluate the local incidence of orofacial cleft (OFC) encountered in fetal morphology scan and prenatal diagnosis, genetic etiology of fetuses with or without other structural abnormalities, and their pregnancy outcomes. DESIGN Retrospective cohort study. SETTING Two maternal fetal medicine units, tertiary hospitals, Hong Kong. PARTICIPANTS All pregnant women with antenatal diagnosis of fetal OFC between January 2016 and December 2020 (N = 66). RESULTS OFC has an incidence of 0.13% among pregnancies in Hong Kong and 28.8% (19/66) were syndromic cleft that exhibited other fetal structural anomalies. There were 55 cases (84.6%) who opted for invasive prenatal diagnostic testing. Genetic defects were identified in 25.8% (17/66) of this cohort, including 14 pathogenic variants. The detection rate in the syndromic cases is 68.4% (13/19) which was significantly higher than 8.5% (4/47) among non-syndromic cases. Aneuploidies would be the most common cause, accounting for 9.1% (6/66). Chromosomal microarray analysis (CMA) provided an incremental diagnostic yield of 6.1% compared to conventional karyotyping. A total of 29 live births including 3 cases of a variant of uncertain significance and 26 cases without genetic abnormalities detected have continued pregnancy to birth. There were 87.5% (21/24) without detectable pathogenic genetic abnormality reported good long-term outcomes. The chance of OFC fetuses having a good long-term outcome was significantly higher if no genomic variant was detected (P < .001). CONCLUSIONS Invasive prenatal tests with CMA should be offered to pregnancies with OFC regardless of the type. It has provided incremental diagnostic yield over conventional karyotyping and helped in prenatal and genetic counseling. A negative result in non-syndromic OFC favors couples to keep the pregnancy.
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Affiliation(s)
- Yan Yu Li
- Department of Obstetrics and Gynaecology, United Christian Hospital, Hong Kong
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong
| | - Wing Ting Tse
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong
| | - Choi Wah Kong
- Department of Obstetrics and Gynaecology, United Christian Hospital, Hong Kong
| | - Natalie Kwun Long Wong
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong
| | - Tak Yeung Leung
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong
| | - Kwong Wai Choy
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong
- Hong Kong Hub of Paediatric Excellence, The Chinese University of Hong Kong, Hong Kong
| | - William Wing Kee To
- Department of Obstetrics and Gynaecology, United Christian Hospital, Hong Kong
| | - Ye Cao
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong
- Hong Kong Hub of Paediatric Excellence, The Chinese University of Hong Kong, Hong Kong
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Lin XM, Zhen L, Wen YJ, Yu QX, Li DZ. Isolated polyhydramnios: Is a genetic evaluation of value? Eur J Obstet Gynecol Reprod Biol 2024; 293:115-118. [PMID: 38141485 DOI: 10.1016/j.ejogrb.2023.12.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 12/15/2023] [Accepted: 12/18/2023] [Indexed: 12/25/2023]
Abstract
OBJECTIVE To analyze the risk for genetic aberrations and pregnancy outcomes in pregnancies with isolated polyhydramnios. STUDY DESIGN This was a retrospective study of singleton pregnancies complicated by isolated polyhydramnios that underwent genetic amniocentesis between 2016 and 2021. Clinical and laboratory data were collected and reviewed for these cases, including maternal demographics, prenatal sonographic findings, chromosomal microarray results, and pregnancy outcomes. RESULTS A total of 94 singleton pregnancies were included. Three (3.2%) cases with chromosomal abnormalities were detected, including 2 case of trisomy 21 and 1 of 22q21.1 microdeletion. One case was diagnosed as Prader-Willi syndrome caused by maternal uniparental disomy of chromosome 15. Perinatal death occurred in 1 case with severe polyhydramnios, and was retrospectively diagnosed as Bartter syndrome. Of the 90 infants survived, two were identified to have single gene disorders after birth by whole exome sequencing. CONCLUSION We first attempted to determine the value of exome sequencing in pregnancies with isolated polyhydramnios. Our results warrant more studies to evaluate advanced genetic testing technologies used in such pregnancies.
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Affiliation(s)
- Xiao-Mei Lin
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Li Zhen
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Yun-Jing Wen
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Qiu-Xia Yu
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Dong-Zhi Li
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China.
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Lu S, Kakongoma N, Hu WS, Zhang YZ, Yang NN, Zhang W, Mao AF, Liang Y, Zhang ZF. Detection rates of abnormalities in over 10,000 amniotic fluid samples at a single laboratory. BMC Pregnancy Childbirth 2023; 23:102. [PMID: 36755227 PMCID: PMC9906931 DOI: 10.1186/s12884-023-05428-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 02/03/2023] [Indexed: 02/10/2023] Open
Abstract
BACKGROUND A growing number of cytogenetic techniques have been used for prenatal diagnosis. This study aimed to demonstrate the usefulness of karyotyping, BACs-on-Beads (BoBs) assay and single nucleotide polymorphism (SNP) array in prenatal diagnosis during the second trimester based on our laboratory experience. METHODS A total of 10,580 pregnant women with a variety of indications for amniocentesis were enrolled in this retrospective study between January 2015 and December 2020, of whom amniotic fluid samples were analysed in 10,320 women. The main technical indicators of participants in the three different technologies were summarized, and cases of chromosome abnormalities were further evaluated. RESULTS The overall abnormality detection rate of karyotyping among all the amniotic fluid samples was 15.4%, and trisomy 21 was the most common abnormality (20.9%). The total abnormality detection rate of the BoBs assay was 5.6%, and the diagnosis rate of microdeletion/microduplication syndromes that were not identified by karyotyping was 0.2%. The detection results of the BoBs assay were 100.0% concordant with karyotyping analysis in common aneuploidies. Seventy (87.5%) cases of structural abnormalities were missed by BoBs assay. The total abnormality detection rate of the SNP array was 21.6%. The detection results of common aneuploidies were exactly the same between SNP array and karyotyping. Overall, 60.1% of structural abnormalities were missed by SNP array. The further detection rate of pathogenic significant copy number variations (CNVs) by SNP was 1.4%. CONCLUSIONS Karyotyping analysis combined with BoBs assay or SNP array for prenatal diagnosis could provide quick and accurate results. Combined use of the technologies, especially with SNP array, improved the diagnostic yield and interpretation of the results, which contributes to genetic counselling. BoBs assay or SNP array could be a useful supplement to karyotyping.
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Affiliation(s)
- Sha Lu
- grid.268505.c0000 0000 8744 8924Zhejiang Chinese Medical University, Hangzhou, Zhejiang People’s Republic of China ,grid.508049.00000 0004 4911 1465Prenatal Screening and Prenatal Diagnosis Center, Hangzhou Women’s Hospital (Hangzhou Maternity and Child Health Care Hospital), No. 369 Kunpeng Rd., Hangzhou, Zhejiang 310008 People’s Republic of China
| | - Nisile Kakongoma
- grid.268505.c0000 0000 8744 8924Zhejiang Chinese Medical University, Hangzhou, Zhejiang People’s Republic of China
| | - Wen-sheng Hu
- grid.268505.c0000 0000 8744 8924Zhejiang Chinese Medical University, Hangzhou, Zhejiang People’s Republic of China ,grid.508049.00000 0004 4911 1465Prenatal Screening and Prenatal Diagnosis Center, Hangzhou Women’s Hospital (Hangzhou Maternity and Child Health Care Hospital), No. 369 Kunpeng Rd., Hangzhou, Zhejiang 310008 People’s Republic of China
| | - Yan-zhen Zhang
- grid.508049.00000 0004 4911 1465Prenatal Screening and Prenatal Diagnosis Center, Hangzhou Women’s Hospital (Hangzhou Maternity and Child Health Care Hospital), No. 369 Kunpeng Rd., Hangzhou, Zhejiang 310008 People’s Republic of China
| | - Nan-nan Yang
- grid.508049.00000 0004 4911 1465Prenatal Screening and Prenatal Diagnosis Center, Hangzhou Women’s Hospital (Hangzhou Maternity and Child Health Care Hospital), No. 369 Kunpeng Rd., Hangzhou, Zhejiang 310008 People’s Republic of China
| | - Wen Zhang
- grid.508049.00000 0004 4911 1465Prenatal Screening and Prenatal Diagnosis Center, Hangzhou Women’s Hospital (Hangzhou Maternity and Child Health Care Hospital), No. 369 Kunpeng Rd., Hangzhou, Zhejiang 310008 People’s Republic of China
| | - Ai-fen Mao
- grid.508049.00000 0004 4911 1465Prenatal Screening and Prenatal Diagnosis Center, Hangzhou Women’s Hospital (Hangzhou Maternity and Child Health Care Hospital), No. 369 Kunpeng Rd., Hangzhou, Zhejiang 310008 People’s Republic of China
| | - Yi Liang
- Department of Neurobiology and Acupuncture Research, The Third School of Clinical Medicine, Zhejiang Chinese Medical University, Key Laboratory of Acupuncture and Neurology of Zhejiang Province, 548 Binwen Road, Binjiang District, Hangzhou, 310053, Zhejiang, People's Republic of China.
| | - Zhi-fen Zhang
- grid.268505.c0000 0000 8744 8924Zhejiang Chinese Medical University, Hangzhou, Zhejiang People’s Republic of China ,grid.508049.00000 0004 4911 1465Prenatal Screening and Prenatal Diagnosis Center, Hangzhou Women’s Hospital (Hangzhou Maternity and Child Health Care Hospital), No. 369 Kunpeng Rd., Hangzhou, Zhejiang 310008 People’s Republic of China
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Zhang YL, Jing XY, Zhen L, Pan M, Han J, Li DZ. Prenatal diagnosis of Miller-Dieker syndrome/PAFAH1B1-related lissencephaly: Ultrasonography and genetically investigative results. Eur J Obstet Gynecol Reprod Biol 2022; 274:28-32. [PMID: 35567955 DOI: 10.1016/j.ejogrb.2022.04.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 04/24/2022] [Accepted: 04/30/2022] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To present the experience on prenatal diagnosis of Miller-Dieker syndrome (MDS)/PAFAH1B1-related lissencephaly to further determine fetal phenotypes of this syndrome. STUDY DESIGN This was a retrospective study of ten pregnancies with fetal MDS/PAFAH1B1-related lissencephaly identified by chromosomal microarray (CMA)/exome sequencing (ES). Clinical and laboratory data were collected and reviewed for these cases, including maternal demographics, prenatal sonographic findings, CMA or ES results and pregnancy outcomes. RESULTS Two cases were diagnosed in the first trimester because of an increased nuchal translucency. The remaining eight cases were identified at late gestation, including four in the second trimester because of fetal cardiac anomalies or ventriculomegaly, and four in the third trimester because of ventriculomegaly. CMA revealed 17p13.3 deletions in nine cases, and ES detected a de novo PAFAH1B1 missense mutation in one case. CONCLUSION The prenatal presentation of MDS/PAFAH1B1-related lissencephaly depended on the gestational age when the diagnosis was made. Mild ventriculomegaly was the most common prenatal sonographic sign identified in cases of MDS/PAFAH1B1-related lissencephaly. It is important that fetal MRI and invasive testing with CMA should be considered in fetuses with apparently 'isolated' mild ventriculomegaly.
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Affiliation(s)
- Yong-Ling Zhang
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Xiang-Yi Jing
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Li Zhen
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Min Pan
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Jin Han
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Dong-Zhi Li
- Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Center affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China.
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Cao Y, Chau M, Zheng Y, Zhao YL, Kwan A, Hui A, Lam YH, Tan T, Tse WT, Wong L, Leung TY, Dong Z, Choy KW. Exploring the diagnostic utility of genome sequencing for fetal congenital heart defects. Prenat Diagn 2022; 42:862-872. [PMID: 35441720 DOI: 10.1002/pd.6151] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 04/14/2022] [Accepted: 04/15/2022] [Indexed: 11/09/2022]
Abstract
OBJECTIVE The diagnostic yield for congenital heart defects (CHD) with routine genetic testing is around 10-20% when considering the pathogenic CNVs or aneuploidies as positive findings. This is a pilot study to investigate the utility of genome sequencing (GS) for prenatal diagnosis of CHD. METHODS Genome sequencing (GS, 30X) was performed on 13 trios with CHD for which karyotyping and/or chromosomal microarray results were non-diagnostic. RESULTS Trio GS provided a diagnosis for 4/13 (30.8%) fetuses with complex CHDs and other structural anomalies. Findings included pathogenic or likely pathogenic variants in DNAH5, COL4A1, PTPN11, and KRAS. Of nine cases without a possibly genetic etiology by GS, we had follow-up on eight. For five of them (60%), the parents chose to keep the pregnancy. A balanced translocation [46,XX,t(14;22)(q32.33;q13.31)mat] was detected in a trio with biallelic DNAH5 mutations, which together explained the recurrent fetal situs inversus and dextrocardia that was presumably due to de novo Phelan-McDermid syndrome. A secondary finding of a BRCA2 variant and carrier status of HBB, USH2A, HBA1/HBA2 were detected in the trio. CONCLUSIONS GS expands the diagnostic scope of mutation types over conventional testing, revealing the genetic etiology for fetal heart anomalies. Patients without a known genetic abnormality indicated by GS likely opted to keep pregnancy especially if the heart issue could be repaired. We provide evidence to support the application of GS for fetuses with CHD. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Y Cao
- Department of Paediatrics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China.,Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China.,Laboratory Genetics and Genomics, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China.,Fertility Preservation Research Centre, Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Mhk Chau
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China.,Laboratory Genetics and Genomics, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China.,Fertility Preservation Research Centre, Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Y Zheng
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Y L Zhao
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Ahw Kwan
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Asy Hui
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Y H Lam
- OB GYN ULTRASOUND, Henley Building, 5 Queen's Road C, Central, Hong Kong SAR, China
| | - Tyt Tan
- Tony Tan Women and Fetal Clinic, Mount Alvernia Hospital, Singapore
| | - W T Tse
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - L Wong
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - T Y Leung
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China.,Laboratory Genetics and Genomics, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China.,The Chinese University of Hong Kong-Baylor College of Medicine Joint Center for Medical Genetics, Hong Kong SAR, China
| | - Z Dong
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China.,Laboratory Genetics and Genomics, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China.,Fertility Preservation Research Centre, Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - K W Choy
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China.,Laboratory Genetics and Genomics, Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China.,Fertility Preservation Research Centre, Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong SAR, China.,The Chinese University of Hong Kong-Baylor College of Medicine Joint Center for Medical Genetics, Hong Kong SAR, China
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Baptiste C, Mellis R, Aggarwal V, Lord J, Eberhardt R, Kilby MD, Maher ER, Wapner R, Giordano J, Chitty LS. Fetal central nervous system anomalies: When should we offer exome sequencing? Prenat Diagn 2022; 42:736-743. [PMID: 35411553 DOI: 10.1002/pd.6145] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 04/06/2022] [Accepted: 04/07/2022] [Indexed: 11/06/2022]
Abstract
OBJECTIVE To investigate the detection of pathogenic variants using exome sequencing in an international cohort of fetuses with central nervous system (CNS) anomalies. METHODS We reviewed trio exome sequencing (ES) results for two previously reported unselected cohorts (Prenatal Assessment of Genomes and Exomes (PAGE) and CUIMC) to identify fetuses with CNS anomalies with unremarkable karyotypes and chromosomal microarrays. Variants were classified according to ACMG guidelines and association of pathogenic variants with specific types of CNS anomalies explored. RESULTS ES was performed in 268 pregnancies with a CNS anomaly identified using prenatal ultrasound . Of those with an isolated, single, CNS anomaly, 7/97 (7.2%) had a likely pathogenic/pathogenic (LP/P) variant. This includes 3/23 (13%) fetuses with isolated mild ventriculomegaly and 3/10 (30%) fetuses with isolated agenesis of the corpus callosum. Where there were multiple anomalies within the CNS, 12/63 (19%) had LP/P variants. Of the 108 cases with CNS and other organ system anomalies, 18 (16.7%) had LP/P findings. CONCLUSION ES is an important tool in the prenatal evaluation of fetuses with any CNS anomaly. The rate of LP/P variants tends to be highest in fetuses with multiple CNS anomalies and multisystem anomalies, however, ES may also be of benefit for isolated CNS anomalies.
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Affiliation(s)
- C Baptiste
- Columbia University Irving Medical Center, 3959 Broadway, New York, 10032-3784, United States
| | - R Mellis
- Genetics and Genomic MedicineUCL GOS Institute of Child Health, UCL, 30 Guilford St, London, WC1N 1EH, United Kingdom of Great Britain and Northern Ireland
| | - V Aggarwal
- Columbia University Irving Medical Center, New York, United States
| | - J Lord
- Southampton University Hospitals NHS Trust, Southampton, United Kingdom of Great Britain and Northern Ireland
| | - R Eberhardt
- Wellcome Sanger Institute, Hinxton, Cambridgeshire, United Kingdom of Great Britain and Northern Ireland
| | - M D Kilby
- Dept. of Fetal Medicine, Birmingham Women's Hospital, Metchley Park rd.Edgbaston, Birmingham, West Midlands, B15 2TG, United Kingdom of Great Britain and Northern Ireland
| | - E R Maher
- University of Cambridge, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - R Wapner
- Obstetrics and Gynecology, Columbia University Medical Centerm, New York, United States
| | - J Giordano
- MFM, Columbia University, 3959 Broadway, New York, 10032, United States
| | - L S Chitty
- Genetics and Genomic Medicine, UCL Institute of Child Health, UCL Great Ormond Street Institute of Child Health.30 Guilford Street, WC1N 1EH, London, United Kingdom of Great Britain and Northern Ireland
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Chau MHK, Qian J, Chen Z, Li Y, Zheng Y, Tse WT, Kwok YK, Leung TY, Dong Z, Choy KW. Trio-Based Low-Pass Genome Sequencing Reveals Characteristics and Significance of Rare Copy Number Variants in Prenatal Diagnosis. Front Genet 2021; 12:742325. [PMID: 34616436 PMCID: PMC8488434 DOI: 10.3389/fgene.2021.742325] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 08/25/2021] [Indexed: 01/22/2023] Open
Abstract
Background: Low-pass genome sequencing (GS) detects clinically significant copy number variants (CNVs) in prenatal diagnosis. However, detection at improved resolutions leads to an increase in the number of CNVs identified, increasing the difficulty of clinical interpretation and management. Methods: Trio-based low-pass GS was performed in 315 pregnancies undergoing invasive testing. Rare CNVs detected in the fetuses were investigated. The characteristics of rare CNVs were described and compared to curated CNVs in other studies. Results: A total of 603 rare CNVs, namely, 597 constitutional and 6 mosaic CNVs, were detected in 272 fetuses (272/315, 86.3%), providing 1.9 rare CNVs per fetus (603/315). Most CNVs were smaller than 1 Mb (562/603, 93.2%), while 1% (6/603) were mosaic. Forty-six de novo (7.6%, 46/603) CNVs were detected in 11.4% (36/315) of the cases. Eighty-four CNVs (74 fetuses, 23.5%) involved disease-causing genes of which the mode of inheritance was crucial for interpretation and assessment of recurrence risk. Overall, 31 pathogenic/likely pathogenic CNVs were detected, among which 25.8% (8/31) were small (<100 kb; n = 3) or mosaic CNVs (n = 5). Conclusion: We examined the landscape of rare CNVs with parental inheritance assignment and demonstrated that they occur frequently in prenatal diagnosis. This information has clinical implications regarding genetic counseling and consideration for trio-based CNV analysis.
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Affiliation(s)
- Matthew Hoi Kin Chau
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, Hong Kong, SAR China.,Hong Kong Hub of Pediatric Excellence, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China
| | - Jicheng Qian
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, Hong Kong, SAR China
| | - Zihan Chen
- Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, Hong Kong, SAR China
| | - Ying Li
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, Hong Kong, SAR China.,Hong Kong Hub of Pediatric Excellence, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China
| | - Yu Zheng
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, Hong Kong, SAR China
| | - Wing Ting Tse
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China
| | - Yvonne K Kwok
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, Hong Kong, SAR China
| | - Tak Yeung Leung
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, Hong Kong, SAR China.,The Chinese University of Hong Kong-Baylor College of Medicine Joint Center For Medical Genetics, Shatin, Hong Kong, SAR China
| | - Zirui Dong
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, Hong Kong, SAR China.,Hong Kong Hub of Pediatric Excellence, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China
| | - Kwong Wai Choy
- Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China.,Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, Hong Kong, SAR China.,Hong Kong Hub of Pediatric Excellence, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR China.,The Chinese University of Hong Kong-Baylor College of Medicine Joint Center For Medical Genetics, Shatin, Hong Kong, SAR China
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