- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03342547
Identification of Host Factors of Norovirus Infections in Mini-Gut Model
Genome-wide CRISPR Screen for Host Factors Associated With Norovirus Infections in Stem Cell-derived Human Intestinal Enteroid Model
The primary objective in this study is to establish a list of host cellular proteins that mediate norovirus infection.
Norovirus is one of the most common pathogens attributed to diarrheal diseases from unsafe food. It is also the primary cause of mortality among young children and adults in foodborne infections. Norovirus is not just a foodborne burden. In a recent meta-analysis, norovirus accounts for nearly one-fifth of all causes of (including person-to-person transmission) acute gastroenteritis in both sporadic and outbreak settings and affects all age groups. Undoubtedly, norovirus is of paramount public health concern in both developed and developing countries. Research efforts to better understand norovirus pathobiology will be necessary for targeted intervention.
From Middle East respiratory syndrome coronavirus to Zika virus, efforts to identify host factors important for mediating virus infection has always been a research priority. Such information will shed light on potential therapeutic targets in antiviral intervention. Norovirus virus-host interaction studies have been hampered by the lack of a robust cell culture model in the past 20 years. In 2016, norovirus has finally been successfully cultivated in a stem cell-derived three-dimensional human gut-like structure called enteroid or mini-gut.
In this study, intestinal stem cells will be isolated from duodenal biopsies collected from participants, followed by differentiation into mini-guts. Genome-wide genetic screening for host essential and restrictive factors will be performed on infected mini-guts by knockout CRISPR and gain-of-function CRISPR SAM, respectively. Shortlisted candidates will undergo preliminary functional validation in cell lines. These data will provide insights into potential therapeutic targets against norovirus infection.
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Study design and overview - This is a laboratory-based study. The investigators plan to establish a list of host cellular proteins regulating norovirus infection. Methods will include establishment of patient-specific stem cell-derived human intestinal enteroids as an infection model and genome-wide CRISPR and CRISPR SAM genetic screens upon infections of two norovirus genotypes.
***Establishment of human intestinal enteroid model***
- Duodenal biopsies and saliva collection - After obtaining IRB-approved informed consent, two duodenal biopsy samples will be obtained from each participant undergoing upper gastrointestinal endoscopy without contraindications for biopsy sampling, such as participants on anti-coagulation or with other causes of bleeding diathesis. Biopsy samples will be immersed in ice-cold 1xPBS and transported immediately to the laboratory within 30 minutes for further processing. In addition, saliva (1-2 mL) will be collected from each participant for secretor status testing by ELISA.
- Isolation of crypt stem cells and differentiation - Upon arrival, biopsy samples will first be chopped into smaller pieces. Intestinal crypt cells will be isolated by repeated washing and incubation with 1x Complete Chelating solution (1xCCS) and EDTA buffer. Supernatant containing crypt cells will then be grown in Matrigel containing complete medium with growth factors (CMGF+) (Wnt 3 and Rspo-1 conditioned media, Noggin, A83, B27, EGF, N2, n-acetylcysteine, gastrin, nicotinamide, and SB202190). Budding crypts will then be incubated in differentiation medium (CMGF+, excluding Wnt 3 conditioned medium, SB202190 and nicotinamide as well as having reduced amount of Rspo-1 conditioned medium and Noggin). Formation of three-dimensional gut-like enteroids will be monitored daily.
Study Type
Enrollment (Anticipated)
Phase
- Not Applicable
Contacts and Locations
Study Contact
- Name: Chi-Wai Chan, PhD
- Phone Number: +852 35051523
- Email: martin.chan@cuhk.edu.hk
Study Locations
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-
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Hong Kong, China
- Recruiting
- Endoscopy Centre, Prince of Wales Hospital
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Contact:
- Chi-Wai Chan, PhD
- Phone Number: +852 35051523
- Email: martin.chan@cuhk.edu.hk
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Principal Investigator:
- Chi-Wai Chan, PhD
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Sub-Investigator:
- Kay-Sheung Chan, MD
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Sub-Investigator:
- Hei Wong, MBChB; DPhil
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Adults aged 18 years or above
- Prospective outpatients undergoing gastrointestinal endoscopy for symptoms of dyspepsia in the Endoscopy Unit of the Prince of Wales Hospital, Shatin, Hong Kong, China
- Able and willing to provide informed written consent
Exclusion Criteria:
- Use of anti-coagulants and/or aspirin that may have increased risk of bleeding
- History of bleeding diathesis
- Contraindications for biopsy sampling
Study Plan
How is the study designed?
Design Details
- Primary Purpose: BASIC_SCIENCE
- Allocation: NA
- Interventional Model: SINGLE_GROUP
- Masking: NONE
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Intestinal stem cell-derived enteroids
Duodenal biopsy samples and saliva will be collected from participants and then processed in laboratory to generate intestinal stem cell-derived enteroids.
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Two duodenal biopsy samples will be collected from each participant
Saliva (1-2 mL) will be collected from each participant for secretor status testing
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Establishment of human intestinal stem cell-derived enteroids
Time Frame: An average of three months
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Viability of enteroids as determined by microscopy
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An average of three months
|
Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Chi-Wai Chan, PhD, Chinese University of Hong Kong
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Anticipated)
Study Completion (Anticipated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- MIC_CHAN_GRF_17_18_v1_20160930
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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