Clinical trial NCT04747184: Variations in the Composition of Respiratory Microbiota
Official title: Variations in the Composition of Respiratory Microbiota Among Asthmatic and Non-asthmatic Subject
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Asthma
Keywords: Asthma
Respiratory microbiota
Haemophilus influenzae
Oral corticosteroids
Inhalers
Lead sponsor: Applied Science Private University
Sponsor class: OTHER
First posted: 2021-02-10
Enrollment: 54
Sex: ALL
Minimum age (years): 14
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: CASE_CONTROL
Time perspective: PROSPECTIVE
Sampling method: PROBABILITY_SAMPLE
Study population: Asthmatic, non-smoker, aged 14 years-old living in Jordan

Brief summary: Induced sputum samples were obtained from 27 asthmatic patients and 27 non-asthmatic subjects. Sequencing of the V4 region of 16S rRNA gene using Illumina MiSeq was performed, followed by analysis of alpha and beta diversity.

Detailed description: The study was conducted over 10 months, from March to December 2019, with patients recruited from Al Bashir public hospital,A convenient sample of 54 participants were approached (27 asthmatic patients and 27 healthy subjects). All the asthmatic patients were recruited from an outpatient clinic at Al Bashir hospital. Study participants were informed about the nature of the study and were included only after obtaining their consent verbally and voluntary. Sociodemographic characteristics were collected from all study participants.

Specimens were collected according to the CDC guidelines for collecting respiratory diseases' samples. All participants were asked to expectorate a sputum sample in special sterile tubes indicated for sputum collection. Particular care was taken to avoid contamination of the sputum sample with the saliva and post-nasal drip by asking the participants to rinse their mouth with sterile water before inducing the sputum sample. Then the expectorated sputum specimen was immediately homogenized and stored in the deep freezer (-80°C) for DNA extraction for microbial gene sequencing and sequence analysis.

located in Amman, the capital city of Jordan. DNA extraction and 16S rRNA sequencing DNA extraction using QIAamp® DNA mini kit (QIAGEN) was done under aseptic techniques in the sterile room for all samples according to the manufacturer instructions. The DNA extracts for the 54 samples collected (27 from asthmatic patients and 27 from healthy subjects) were stored at -80° C in a sterile Eppendorf tubes until they were sent to the Molecular Research (MR DNA) Lab (Molecular Research LP, Shallowater, TX, USA) for sequencing. Briefly, PCR amplification of the 16s rRNA gene and its subsequent sequencing was done using Illumina. The 16s rRNA gene V4 variable region PCR primers ill27Fmod (AGRGTTTGATCMTGGCTCAG) /ill519Rmod (GTNTTACNGCGGCKGCTG) with barcode on the forward primer were used in 30 cycles using the HotStarTaq Plus Master Mix Kit (Qiagen, USA). After amplification, PCR products were checked in 2% agarose gel to determine the success of amplification and the relative intensity of bands.

The pooled and purified PCR product was then used to prepare the Illumina DNA library. Sequencing was performed on a MiSeq following the manufacturer's guidelines. Sequence data were processed using the MR DNA analysis pipeline (MR DNA, Shallowater, TX, USA). In summary, the sequences were joined, depleted of barcodes then sequences \<150bp removed, sequences with ambiguous base calls were removed. Sequences were denoised, Operational taxonomic units (OTUs) generated and chimeras removed. The OTUs were defined by clustering at 3% divergence (97% similarity). Final OTUs were taxonomically classified using BLASTn against a curated database derived from RDPII and NCBI (www.ncbi.nlm.nih.gov, http://rdp.cme.msu.edu). For alpha diversity index, namely, Shannon index H, it was carried out in "Past Program" for data analysis version 4.02, after filtering out the reading with relative abundance of \<1%. Shannon index varies from 0 for communities with only a single taxon to high values for communities with many taxa (DeJong, 1975).

Eligibility criteria: Inclusion Criteria:

1. Asthmatic patients
2. healthy subjects
3. aged 14-year-old

Exclusion Criteria:

1. Smokers
2. patients reported having taken antibiotics for at least two months before study enrolment 3- patients who had other respiratory diseases or infections.

Primary outcomes:
measure: To identify the common microorganisms in the LRT among asthmatic patients and non-asthmatic subjects in Jordan
timeFrame: 10 months
Secondary outcomes:
measure: To identify a common microbial bioindicator that could be used as a diagnostic tool
timeFrame: 10 months
Other outcomes:
Locations:
city: Amman
country: Jordan
facility: Applied Science private University
Study officials:
affiliation: Faculty of Pharmacy, Applied Science Private University
name: Mohammad Al-Najjar, PhD
role: PRINCIPAL_INVESTIGATOR
References: