Metagenomic and Immune-inflammatory Analysis of Individuals With Generalized Aggressive Periodontitis and Their Descendants.

Generalized aggressive periodontitis (GAgP) is a multifactorial disease related to several aspects that influence its installation and progression. A constant microbial colonization, an altered inflammatory response, and a clear genetic factor are cited as possible factors associated with this pathology. Thus, aggressive periodontitis subjects could transmit for their descendants some genetical alterations, such as inflammatory response pattern associated with periodontal destruction and susceptibility to colonization by some pathogens, increasing the risk of develops this disease. This way, this project is aimed to evaluate the pattern of microbiological colonization and the inflammatory response pattern associated with it, comparing parents with generalized aggressive periodontitis and their children and periodontally healthy parents and their children. Thirty families will be selected and divided into two groups: Test group (n=15 families) families in which the parents (or at least one of them) present generalized aggressive periodontitis and one child (age ranging from 6-12 years old); Control group (n=15 families) families in which the parents (both of them) present periodontal healthy and one child (age ranging from 6-12 years old). The groups will be composed using a gender- and age-matched structure. The children will participate in a hygiene program and will be monitored for 3 months. All individuals (parents and children) will be clinically assessed for plaque and bleeding index, periodontal probing depth, clinical attachment level and gingival recession. During this period, samples of gingival crevicular fluid (GCF) and subgingival biofilm from periodontal pockets/sites from all subject (parents and children) will be collected. The GCF will be analyzed and the detection of interleukin (IL)-1β, IL-4, IL-6, IL-8, IL-10, IL-17, tumor necrosis factor (TNF)-α, and interferon (INF)-γ will be done using Luminex/MAGpix technology. In a subgingival biofilm, the DNA will be extracted and the microbiome and its functional characteristics will be evaluated by metagenomics and bioinformatics analysis. The data will be compared by Student's t-test, Mann-Whitney e Wilcoxon tests. The significance level for all analysis will be 5%.

Study Overview

• Status: Completed
• Conditions: Generalized Aggressive Periodontitis
• Intervention / Treatment: Other: Plaque control

• Study Type: Observational
• Enrollment (Actual): 66

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 6 years and older (Child, Adult, Older Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

The population selected from Piracicaba Dental School graduation clinic

Description

Inclusion Criteria:

• GAgP parents: i) less than 35 years old at the diagnosis; ii) at least 8 teeth with probing depth (PD) and clinical attachment level (CAL) > 5mm (with at least 2 sites with PD > 7mm) at diagnosis; iii) at least 20 teeth in the oral cavity; iv) good systemic health.
• Health parents: i) Good systemic health; ii) at least 20 teeth in the oral cavity; iii) absence of periodontal pockets/gingival sulcus with PD > 4mm; iv) absence of proximal bone loss.
• Children: i) to present parents respecting the inclusion criteria for periodontal health or GAgP; ii) 6 to 12 years of age at the beginning of study iii) good systemic health iv) presence of first molars and central incisors.

Exclusion Criteria

• the use of antibiotics and anti-inflammatory medication 6 months prior to the study;
• smoking habits
• pregnancy or lactation.

Study Plan

How is the study designed?

Number of groups / cohorts

4

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
GAgP parents; Parents diagnosed with Generalized Aggressive Periodontitis
GAgP children; Children from parents diagnosed with Generalized Aggressive Periodontitis	Other: Plaque control; Children were instructed about the hygiene procedures
Health parents; Parents diagnosed as periodontally healthy
Health children; children from parents diagnosed as periodontally healthy	Other: Plaque control; Children were instructed about the hygiene procedures

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change of the baseline plaque index on probing at 3 months	Reduction in the amount of plaque accumulation around the gingival marginal after the therapy.	Baseline and 3 months for each test

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change of the baseline bleeding on probing at 3 months	Bleeding induced at the depth of the gingival sulcus or periodontal pocket after probing	Baseline and 3 months for each test
Change of the baseline inflammatory markers levels in gingival crevicular fluid (pg/uL) at 3 months	Concentration of IL-1β, IL-4, IL-6, IL-8, IL-10, IL-17, TNF-α and INF-γ released in gingival crevicular fluid	Baseline and 3 months for each test
Change in the microbial composition at 3 months	Concentration of bacteria in the subgingival biofilm	Baseline and 45 days for each test

Collaborators and Investigators

• Sponsor: University of Campinas, Brazil

Study record dates

Study Major Dates

• Study Start (Actual): April 1, 2016
• Primary Completion (Actual): December 15, 2016
• Study Completion (Actual): February 15, 2017

Study Registration Dates

• First Submitted: April 29, 2019
• First Submitted That Met QC Criteria: April 29, 2019
• First Posted (Actual): May 1, 2019

Study Record Updates

• Last Update Posted (Actual): May 3, 2019
• Last Update Submitted That Met QC Criteria: May 1, 2019
• Last Verified: May 1, 2019

More Information

Terms related to this study

• Keywords: Family; Microbiome; Cytokines; Aggressive Periodontitis
• Additional Relevant MeSH Terms: Behavioral Symptoms; Stomatognathic Diseases; Periodontal Diseases; Mouth Diseases; Aggression; Periodontitis; Aggressive Periodontitis
• Other Study ID Numbers: 079/2013

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: UNDECIDED

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No