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Mapping of the Developmental Atlas of the Visual System and Research on Embryonic Neurogenesis Phenomena

6. Juli 2026 aktualisiert von: Sheng Liu

This research studies how nerve cells in the human embryonic retina, visual brain regions, and brain areas responsible for higher cognitive functions grow, develop, and form interconnected functional networks.

Eye tissue, visual brain tissue, and other brain tissue linked to advanced cognitive functions will be collected from embryos whose pregnancies were terminated due to medical conditions or illnesses. High-throughput single-cell and single-nucleus sequencing will be utilized to map gene activity patterns and developmental growth pathways of retinal nerve cells.

Multiple testing tools will be combined to analyze these brain and retinal cells: Patch-seq (single-cell patch-clamp sequencing), high-density microelectrode arrays (MEA), and two-photon calcium imaging. With these tools, systematic measurements will be performed on the electrical activity, physical shape, synaptic connection patterns, and signal coding functions of neurons in the retina and visual brain regions. Multi-modal tissue maps and a public database will be constructed to store all collected research data.

Immunofluorescence staining will also be applied to compare structural differences and nerve fiber connections between visual brain regions and higher cognitive brain areas. The regenerative capacity and neuron formation process of embryonic brain stem cells, as well as the migration paths of developing neurons, will be tracked.

Overall, this study aims to fully uncover the neural foundation of visual signal processing, and identify the molecular regulatory networks that control nerve tissue development during the embryonic stage.

Studienübersicht

Status

Rekrutierung

Bedingungen

Intervention / Behandlung

Studientyp

Beobachtungs

Einschreibung (Geschätzt)

200

Kontakte und Standorte

Dieser Abschnitt enthält die Kontaktdaten derjenigen, die die Studie durchführen, und Informationen darüber, wo diese Studie durchgeführt wird.

Studienkontakt

Studieren Sie die Kontaktsicherung

Studienorte

    • Guangdong
      • Guangzhou, Guangdong, China, 510060
        • Rekrutierung
        • Zhongshan Ophthalmic Center, Sun Yat-sen University
        • Kontakt:
        • Hauptermittler:
          • Sheng Liu

Teilnahmekriterien

Forscher suchen nach Personen, die einer bestimmten Beschreibung entsprechen, die als Auswahlkriterien bezeichnet werden. Einige Beispiele für diese Kriterien sind der allgemeine Gesundheitszustand einer Person oder frühere Behandlungen.

Zulassungskriterien

Studienberechtigtes Alter

  • Kind
  • Erwachsene
  • Älterer Erwachsener

Akzeptiert gesunde Freiwillige

Ja

Probenahmeverfahren

Nicht-Wahrscheinlichkeitsprobe

Studienpopulation

This study recruits pregnant patients undergoing termination of pregnancy at the Third Affiliated Hospital of Sun Yat-sen University, divided into an embryonic developmental abnormality group (Abnormal group) and a normal control group (Normal group), with a planned enrollment of 100 subjects per group. The gestational age of embryos ranges from 9 to 40 weeks. Two types of samples are included: retrospective cryopreserved specimens from the hospital biobank collected between January 2025 and January 2026 (20 cases per group, with donors having signed informed consent for specimen research use); and prospective fresh specimens collected between February 2026 and June 2027 (80 cases per group). All participants sign study-specific written informed consent.

Beschreibung

Inclusion Criteria:

  • Abnormal group: Embryos with clinically confirmed embryonic developmental abnormalities requiring medical termination of pregnancy; intact retinal, visual and cognitive brain tissues available for snATAC-seq, scRNA-seq, electrophysiology, proteomics and RNAscope detection.

Normal group: Embryos confirmed free of any ocular and central nervous developmental defects by prenatal examination and anatomical observation; intact embryonic ocular and brain tissues meeting all experimental detection standards.

All sample donors have signed written informed consent authorizing the use of residual embryonic tissues for scientific research, with no monetary compensation involved.

Exclusion Criteria:

  • Embryonic ocular or brain tissues with severe necrosis, structural damage or microbial contamination that cannot support multi-omics and functional experiments.

Donors who withdraw or refuse the consent for tissue research use. Samples with irregular collection, transportation or cryopreservation procedures resulting in tissue degradation and failure to meet experimental requirements.

Studienplan

Dieser Abschnitt enthält Einzelheiten zum Studienplan, einschließlich des Studiendesigns und der Messung der Studieninhalte.

Wie ist die Studie aufgebaut?

Designdetails

Kohorten und Interventionen

Gruppe / Kohorte
Intervention / Behandlung
Abnormal Group
Embryos with confirmed embryonic developmental abnormalities, gestational age 9-40 weeks, from patients receiving clinically indicated termination of pregnancy. Tissue collection and multi-omics sequencing analysis will be performed on ocular and brain tissues.
This observational study collects discarded human embryonic ocular and brain tissues from patients undergoing clinically indicated termination of pregnancy, with gestational age ranging from 9 to 40 weeks. We separate retinal, visual cortex and high-order cognitive cortex tissues, then perform single-cell multi-omics sequencing including transcriptome, chromatin accessibility and proteome profiling. The data is used to explore retinal neurogenesis, neuronal developmental trajectories and multi-modal cell atlas of embryonic visual system, without any clinical intervention on participants.
Normal Group
Embryonic tissues derived from normally developing embryos with gestational age of 9 to 40 weeks, collected from pregnant women who voluntarily received clinically indicated termination of pregnancy. Ocular and brain tissues will be collected and subjected to multi-omics sequencing analysis consistent with the abnormal group.
This observational study collects discarded human embryonic ocular and brain tissues from patients undergoing clinically indicated termination of pregnancy, with gestational age ranging from 9 to 40 weeks. We separate retinal, visual cortex and high-order cognitive cortex tissues, then perform single-cell multi-omics sequencing including transcriptome, chromatin accessibility and proteome profiling. The data is used to explore retinal neurogenesis, neuronal developmental trajectories and multi-modal cell atlas of embryonic visual system, without any clinical intervention on participants.

Was misst die Studie?

Primäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Single-cell transcriptomic atlas and developmental trajectory of embryonic retinal and visual cortical neurons
Zeitfenster: Day 1 of tissue collection
Perform single-cell RNA sequencing on human embryonic eye and brain tissues from abnormal developmental group and normal control group. Identify all cell subtypes in retina and visual-associated cognitive cortex, reconstruct continuous developmental trajectory of retinal neurogenesis and visual cortical neurons, and compare neuronal subtype distribution differences between the two groups.
Day 1 of tissue collection
Genome-wide chromatin open regions in embryonic visual tissues
Zeitfenster: Day 1 of tissue collection
Genome-wide chromatin open regions are detected via snATAC-seq on embryonic ocular and brain tissues from case and control groups.
Day 1 of tissue collection
Differential chromatin accessibility between normal and malformed embryonic visual tissues
Zeitfenster: Day 1 of tissue collection
Differential chromatin accessibility signals are identified via integrated analysis of snATAC-seq and scRNA-seq data from embryonic ocular and brain tissues.
Day 1 of tissue collection
Candidate pathogenic genes underlying embryonic visual developmental abnormalities
Zeitfenster: Day 1 of tissue collection
Genes linked to abnormal embryonic visual development are screened based on differential chromatin and transcriptomic profiles.
Day 1 of tissue collection

Sekundäre Ergebnismessungen

Ergebnis Maßnahme
Maßnahmenbeschreibung
Zeitfenster
Action potential firing patterns of embryonic visual neurons
Zeitfenster: Day 1 of tissue collection
Action potential firing patterns are recorded via combined Patch-seq and MEA on primary cultured retinal and visual cortical neurons from case and control embryonic tissues.
Day 1 of tissue collection
Synchronous electrical activity of embryonic neuronal networks
Zeitfenster: Day 1 of tissue collection
Neuronal network synchronous electrical activity is recorded via combined Patch-seq and MEA on primary cultured retinal and visual cortical neurons from case and control embryonic tissues.
Day 1 of tissue collection
Spatial expression localization of key visual development genes detected by RNAscope
Zeitfenster: The day 1 of embryonic tissue collection after clinical termination of pregnancy
RNAscope in situ hybridization is conducted on embryonic retinal and brain tissue slices to visualize the spatial distribution and quantitative expression levels of candidate pathogenic genes screened from multi-omics data. Compare the spatial gene expression differences between normal embryonic visual tissues and tissues with ocular developmental defects.
The day 1 of embryonic tissue collection after clinical termination of pregnancy
Differentially expressed proteins identified via global proteome sequencing
Zeitfenster: Day 1 of tissue collection
Global proteome sequencing is performed on embryonic ocular and brain tissues to generate lists of differentially expressed proteins linked to retinal neurogenesis and visual cortical development.
Day 1 of tissue collection
Spatial localization and expression abundance of proteins via immunohistochemistry
Zeitfenster: Day 1 of tissue collection
Immunohistochemistry staining is applied on embryonic tissue sections to detect spatial localization and expression abundance of core differentially expressed proteins.
Day 1 of tissue collection

Mitarbeiter und Ermittler

Hier finden Sie Personen und Organisationen, die an dieser Studie beteiligt sind.

Sponsor

Mitarbeiter

Publikationen und hilfreiche Links

Die Bereitstellung dieser Publikationen erfolgt freiwillig durch die für die Eingabe von Informationen über die Studie verantwortliche Person. Diese können sich auf alles beziehen, was mit dem Studium zu tun hat.

Studienaufzeichnungsdaten

Diese Daten verfolgen den Fortschritt der Übermittlung von Studienaufzeichnungen und zusammenfassenden Ergebnissen an ClinicalTrials.gov. Studienaufzeichnungen und gemeldete Ergebnisse werden von der National Library of Medicine (NLM) überprüft, um sicherzustellen, dass sie bestimmten Qualitätskontrollstandards entsprechen, bevor sie auf der öffentlichen Website veröffentlicht werden.

Haupttermine studieren

Studienbeginn (Tatsächlich)

16. Januar 2026

Primärer Abschluss (Geschätzt)

1. Juni 2027

Studienabschluss (Geschätzt)

1. Juni 2027

Studienanmeldedaten

Zuerst eingereicht

23. Juni 2026

Zuerst eingereicht, das die QC-Kriterien erfüllt hat

6. Juli 2026

Zuerst gepostet (Tatsächlich)

7. Juli 2026

Studienaufzeichnungsaktualisierungen

Letztes Update gepostet (Tatsächlich)

7. Juli 2026

Letztes eingereichtes Update, das die QC-Kriterien erfüllt

6. Juli 2026

Zuletzt verifiziert

1. Juni 2026

Mehr Informationen

Begriffe im Zusammenhang mit dieser Studie

Andere Studien-ID-Nummern

  • IIT2025136

Plan für individuelle Teilnehmerdaten (IPD)

Planen Sie, individuelle Teilnehmerdaten (IPD) zu teilen?

NEIN

Beschreibung des IPD-Plans

The raw individual-level data contains identifiable embryonic genomic information. To protect participants' privacy and comply with domestic biomedical research ethics and data security laws, we cannot share the original IPD with external researchers. Processed analytical results including cell atlas, differential genes and regulatory networks will be released together with related publications.

Diese Informationen wurden ohne Änderungen direkt von der Website clinicaltrials.gov abgerufen. Wenn Sie Ihre Studiendaten ändern, entfernen oder aktualisieren möchten, wenden Sie sich bitte an register@clinicaltrials.gov. Sobald eine Änderung auf clinicaltrials.gov implementiert wird, wird diese automatisch auch auf unserer Website aktualisiert .