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Utility of Whole Genome Sequencing in Fetuses With Abnormal Ultrasound Findings

20 de maio de 2026 atualizado por: Women's Hospital School Of Medicine Zhejiang University

Clinical Study on Prenatal Diagnosis of Fetal Abnormalities of Unknown Cause Using Whole-Genome Sequencing: A Multicenter Study

The goal of this observational study is to learn if whole-genome sequencing (WGS) can help find the genetic cause in fetuses with structural abnormalities that remain unexplained after standard genetic testing (such as karyotyping, chromosomal microarray, or whole-exome sequencing). It will also learn how WGS results may affect pregnancy management and family decision-making.

The main questions it aims to answer are:

How often does WGS identify a genetic cause in these fetuses? Does WGS find more genetic causes compared to standard genetic tests? Can combining WGS with other molecular analyses help discover new disease genes or pathways? Researchers will compare WGS results to results from standard genetic tests to see if WGS finds more genetic causes.

Participants are pregnant women whose fetuses have structural abnormalities seen on ultrasound or MRI, with negative results from routine genetic testing. Participants will:

Undergo an invasive procedure (such as amniocentesis) or provide postnatal samples as part of their regular medical care Allow the use of leftover samples for WGS and additional molecular studies Be followed until after delivery to collect information on pregnancy outcomes and neonatal health

Visão geral do estudo

Status

Recrutamento

Condições

Tipo de estudo

Observacional

Inscrição (Estimado)

1000

Contactos e Locais

Esta seção fornece os detalhes de contato para aqueles que conduzem o estudo e informações sobre onde este estudo está sendo realizado.

Contato de estudo

Nome: Qiong Luo
Número de telefone: +86 571 89998819
E-mail: luoq@zju.edu.cn

Locais de estudo

China
- Zhejiang
  - Hangzhou, Zhejiang, China, 310006
    - Recrutamento
    - Women's Hospital School Of Medicine Zhejiang University
    - Contato:
      
      Qiong Luo
      
      Número de telefone: +86 571 89998819
      
      E-mail: luoq@zju.edu.cn
  - Huzhou, Zhejiang, China, 313000
    - Recrutamento
    - Huzhou Maternity & Child Care Hospital
    - Contato:
      
      Liping Qiu
      
      Número de telefone: +86 15906823270
      
      E-mail: 392686340@qq.com
  - Quzhou, Zhejiang, China, 324000
    - Recrutamento
    - Quzhou Maternal and Child Health Care Hospital
    - Contato:
      
      Yuying Zhu
      
      Número de telefone: +86 15257023995
      
      E-mail: zhuyuy123@163.com
  - Shaoxing, Zhejiang, China, 312000
    - Recrutamento
    - Shaoxing Maternity & Child Care Hospital
    - Contato:
      
      Hualin Xu
      
      Número de telefone: +86 13867526767
      
      E-mail: xhl0175@sina.cn

Critérios de participação

Os pesquisadores procuram pessoas que se encaixem em uma determinada descrição, chamada de critérios de elegibilidade. Alguns exemplos desses critérios são a condição geral de saúde de uma pessoa ou tratamentos anteriores.

Critérios de elegibilidade

Idades elegíveis para estudo

Adulto
Adulto mais velho

Aceita Voluntários Saudáveis

Não

Método de amostragem

Amostra Não Probabilística

População do estudo

Pregnant women aged 18 years or older with singleton pregnancies, whose fetuses have structural abnormalities detected by ultrasound or MRI between 11+0 and 32+0 weeks of gestation, and who are scheduled to undergo invasive or postnatal genetic diagnostic procedures.

Descrição

Inclusion Criteria:

Pregnant women aged ≥ 18 years.
Singleton pregnancy.
Gestational age between 11+0 and 32+0 weeks, with ultrasound or MRI indicating a definite structural malformation in the fetus (may be with or without soft marker abnormalities) requiring prenatal diagnosis (see Appendices 1 and 2). Fetal developmental abnormalities include those of the central nervous system, cardiovascular system, craniofacial/neck region, chest/mediastinum, abdomen/digestive tract, urinary system, skeletal system/limbs, and systemic abnormalities such as fetal hydrops, abnormally thickened placenta with hydrops, and severe growth restriction. Criteria for ultrasound soft markers and structural malformations are provided in the appendices.
Planned to undergo at least one invasive or postnatal procedure for genetic diagnosis, and consent to the use of residual diagnostic samples for research testing.
Signed unified informed consent form, agreement to follow-up, and consent for storage and submission of samples and data according to the protocol.

Exclusion Criteria:

Age < 18 years or individuals lacking full capacity for civil conduct.
Twin or multiple pregnancies.
Known parental or familial carrier status of a pathogenic variant highly consistent with the current fetal phenotype, where testing is planned only for targeted confirmation.
Refusal to consent to the storage and use of samples and data for this study.
Other conditions deemed unsuitable for participation in this study by the investigator.

Plano de estudo

Esta seção fornece detalhes do plano de estudo, incluindo como o estudo é projetado e o que o estudo está medindo.

Como o estudo é projetado?

Detalhes do projeto

O que o estudo está medindo?

Medidas de resultados primários

Medida de resultado	Descrição da medida	Prazo
Diagnostic yield of WGS Prazo: 8 weeks after enrollment of the last participant	Proportion of fetuses with structural malformations or significant ultrasound abnormalities in whom whole-genome sequencing (WGS) using fetal and related tissues identifies at least one pathogenic or likely pathogenic variant. Overall diagnostic yield (including pathogenic/likely pathogenic variants and variants of uncertain significance reclassified as pathogenic/likely pathogenic based on additional evidence) will also be reported.	8 weeks after enrollment of the last participant
Comparison of diagnostic increment of WGS vs. standard clinical testing pathway Prazo: 12 weeks after enrollment of the last participant	Difference in diagnostic rate (proportion of fetuses with pathogenic/likely pathogenic variants) between whole-genome sequencing (WGS) and the current standard clinical testing pathway (karyotyping, CMA/CNV-seq, WES/panel). Stratified analysis by malformation type (e.g., isolated CNS, cardiac, skeletal, multiple systems) and by pattern of system involvement will be reported.	12 weeks after enrollment of the last participant
Number of novel candidate disease genes and enriched molecular pathways Prazo: At study completion (average 24 months after first participant enrollment)	Count of novel candidate disease genes or regulatory elements identified by integrated multi-omics analysis. List of enriched KEGG pathways and GO terms (with FDR < 0.05) associated with fetal developmental abnormalities.	At study completion (average 24 months after first participant enrollment)

Medidas de resultados secundários

Medida de resultado	Descrição da medida	Prazo
Phenotypic stratification system and gene pathway enrichment results Prazo: At study completion (average 24 months after first participant enrollment)	Phenotypic classification system (based on organ/system involvement: isolated, multiple, syndromic). For each subtype: (1) count and frequency of pathogenic/likely pathogenic variants; (2) count of variant types (SNV, Indel, SV, CNV); (3) list of enriched KEGG pathways and GO terms with FDR < 0.05.	At study completion (average 24 months after first participant enrollment)
Reclassification rate of variants of uncertain significance (VUS) and impact on counseling decisions Prazo: At study completion (average 24 months after first participant enrollment)	Proportion of VUS reclassified to pathogenic/likely pathogenic or benign/likely benign after multi-omics integration. Number of participants/families with altered genetic counseling or clinical decision-making (e.g., termination, prenatal intervention, postnatal follow-up plan) due to reclassification.	At study completion (average 24 months after first participant enrollment)
Establishment of a multicenter database and biobank Prazo: At study completion (average 24 months after first participant enrollment)	A unified, relational database containing de-identified clinical phenotypes, genotypes (WGS variants), multi-omics data (e.g., transcriptomic, epigenomic), and biospecimen inventory (e.g., DNA, RNA, plasma, tissue blocks) from participating centers. Database completion will be defined as ≥90% of expected participants with all required data types uploaded and quality-controlled. Biobank completion will be defined as ≥90% of expected biospecimens collected, processed, and stored with traceable metadata.	At study completion (average 24 months after first participant enrollment)
Standardized data submission and sharing protocols Prazo: At study completion (average 24 months after first participant enrollment)	Completion of a written protocol document (yes/no) covering sample submission, data formats, quality thresholds, reporting template (ACMG/AMP classification), clinical data dictionary, and de-identification rules, with sign-off obtained from all participating centers' principal investigators and data managers.	At study completion (average 24 months after first participant enrollment)

Colaboradores e Investigadores

É aqui que você encontrará pessoas e organizações envolvidas com este estudo.

Patrocinador

Women's Hospital School Of Medicine Zhejiang University

Datas de registro do estudo

Essas datas acompanham o progresso do registro do estudo e os envios de resumo dos resultados para ClinicalTrials.gov. Os registros do estudo e os resultados relatados são revisados pela National Library of Medicine (NLM) para garantir que atendam aos padrões específicos de controle de qualidade antes de serem publicados no site público.

Datas Principais do Estudo

Início do estudo (Real)

12 de março de 2026

Conclusão Primária (Estimado)

12 de setembro de 2027

Conclusão do estudo (Estimado)

12 de março de 2028

Datas de inscrição no estudo

Enviado pela primeira vez

9 de abril de 2026

Enviado pela primeira vez que atendeu aos critérios de CQ

20 de maio de 2026

Primeira postagem (Real)

26 de maio de 2026

Atualizações de registro de estudo

Última Atualização Postada (Real)