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Risk of Recurrence of de Novo Mutations: Research and Quantification of Paternal Germinal Mosaicism by the Combined Use of Genomic Tools

NCT04564235 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 5

Last updated 2026-04-20

No results posted yet for this study

Summary

1. Inclusion of 5 families Inclusions will be made by the clinical genetics department of the Rouen University Hospital (monocentric study) and will correspond to trios of parents + child with unexplained developmental abnormalities. The inclusion of patients will be integrated in routine care and will have as immediate benefit for the included families the extensive analysis of the proband and their parents' genomes by short and long read sequencing techniques, which represent the most comprehensive diagnostic tests for developmental diseases, and which are not currently routinely available. Inclusion in clinical genetics by clinicians accustomed to prescribing genome-wide analyses will allow clear and complete information to families. Collection of consents. The trio's DNA will already be available at the molecular genetics laboratory, and a new blood sample may be proposed if necessary. Collection of sperm from the father.
2. Identification of a large set of de novo mutations. Extraction of blood DNA and sending for sequencing of the complete genome to the National Centre for Research in Human Genomics (CNRGH, Evry), in the framework of a collaboration already initiated. Analysis of the sequencing data thanks to the already existing expertise in Rouen. Identification of about 40-120 de novo mutations per trio. At this stage: interpretation of the variations identified with the secondary objective of identifying the cause of the disease in children. Long read genomes will allow to phase the de novo variants to the paternal or to the maternal haplotype.
3. Search for de novo mutations in paternal sperm samples. Extraction of spermatic DNA. Design of a sequencing panel targeting the genetic variations identified in the different trios. Preparation of the libraries, targeted high throughput sequencing at great depth thanks to the techniques and equipment already operational. Specific search for the de novo variations identified in the probands (in 2.), with for each evaluation of (i) the presence of the variation in the sperm sample, (ii) the quantity of mosaicism, reflecting the proportion of carrier spermatozoa and therefore the risk of recurrence, (iii) the presence of my variation in the blood sample of both parents in deep sequencing.

Conditions

  • Developmental Disorders

Interventions

GENETIC

genome-wide analyses

genome-wide analyses will be done in patients and parents (father, mother)

GENETIC

Search for de novo mutations in paternal sperm samples

Sperm analysis will be done in paternal samples

Sponsors & Collaborators

  • University Hospital, Rouen

    lead OTHER

Principal Investigators

  • François LECOQUIERRE, MD · University Hospital, Rouen

Study Design

Allocation
NA
Purpose
DIAGNOSTIC
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2021-02-24
Primary Completion
2022-12-12
Completion
2022-12-12

Countries

  • France

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT04564235 on ClinicalTrials.gov