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Utility of Whole Genome Sequencing in Fetuses With Abnormal Ultrasound Findings

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

Descripción general del estudio

Estado

Reclutamiento

Condiciones

Tipo de estudio

De observación

Inscripción (Estimado)

1000

Contactos y Ubicaciones

Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.

Estudio Contacto

  • Nombre: Qiong Luo
  • Número de teléfono: +86 571 89998819
  • Correo electrónico: luoq@zju.edu.cn

Ubicaciones de estudio

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

Criterios de participación

Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.

Criterio de elegibilidad

Edades elegibles para estudiar

  • Adulto
  • Adulto Mayor

Acepta Voluntarios Saludables

No

Método de muestreo

Muestra no probabilística

Población de estudio

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.

Descripción

Inclusion Criteria:

  1. Pregnant women aged ≥ 18 years.
  2. Singleton pregnancy.
  3. 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.
  4. 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.
  5. 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:

  1. Age < 18 years or individuals lacking full capacity for civil conduct.
  2. Twin or multiple pregnancies.
  3. 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.
  4. Refusal to consent to the storage and use of samples and data for this study.
  5. Other conditions deemed unsuitable for participation in this study by the investigator.

Plan de estudios

Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.

¿Cómo está diseñado el estudio?

Detalles de diseño

¿Qué mide el estudio?

Medidas de resultado primarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Diagnostic yield of WGS
Periodo de tiempo: 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
Periodo de tiempo: 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
Periodo de tiempo: 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 resultado secundarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Phenotypic stratification system and gene pathway enrichment results
Periodo de tiempo: 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
Periodo de tiempo: 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
Periodo de tiempo: 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
Periodo de tiempo: 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

Aquí es donde encontrará personas y organizaciones involucradas en este estudio.

Patrocinador

Fechas de registro del estudio

Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados ​​por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.

Fechas importantes del estudio

Inicio del estudio (Actual)

12 de marzo de 2026

Finalización primaria (Estimado)

12 de septiembre de 2027

Finalización del estudio (Estimado)

12 de marzo de 2028

Fechas de registro del estudio

Enviado por primera vez

9 de abril de 2026

Primero enviado que cumplió con los criterios de control de calidad

20 de mayo de 2026

Publicado por primera vez (Actual)

26 de mayo de 2026

Actualizaciones de registros de estudio

Última actualización publicada (Actual)

26 de mayo de 2026

Última actualización enviada que cumplió con los criterios de control de calidad

20 de mayo de 2026

Última verificación

1 de marzo de 2026

Más información

Términos relacionados con este estudio

Otros números de identificación del estudio

  • IRB-20260095-R

Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .