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Updated: Jun 8, 2026

Identification of Rare Bacterial Pathogens by 16S rRNA Gene Sequencing and MALDI-TOF MS
Published on: July 11, 2016
[Value of microbial gene 16SrRNA in the identification of antenatal infection]
1Department of Pediatrics, Shengjing Hospital, China Medical University, Shenyang 110004, China. lijuan8@yahoo.com.cn.
Objective:
To study the relationship between microbial gene 16SrRNA and intrauterine infection.
Methods:
Thirty cases of single preterm birth were enrolled, including 16 cases due to premature rupture of membranes (PROM) (rupture time>18 hrs), 6 cases due to spontaneous preterm birth and 8 cases due to iatrogenic preterm birth. Ten cases of single term birth were used as the control group. Fetal membrane and placenta samples were obtained. Amniotic fluid, blood from cord or newborn babies as well as gastric fluid and tracheal secretions from infants with mechanical ventilation were also obtained. The histological features of placenta and fetal membranes were observed. Polymerase chain reaction (PCR) was used to detect the presence of microbial 16SrRNA and ureaplasma urealyticum (UU) in placenta, fetal membranes and other samples.
Results:
Twenty-one (70%) cases were diagnosed as chorioamnionitis, characterized by neutrophil infiltration in fetal membrane and placenta tissues, especially in fetal membranes. Chorioamnionitis was most frequent in babies whose gestational age less than 32 weeks or birth weight lower than 1 500 g. Positive 16SrRNA gene was found in 12 cases, and positive UU gene in 10 cases in the preterm birth group. Neither 16SrRNA nor UU gene was detected in the control group. The PROM preterm babies developed more frequent infection than the babies premature born due to other causes, but there were no statistically significant differences in the incidence of infection.
Conclusions:
Chorioamnionitis may be the major cause of PROM and premature birth. The detection of microbial genes is valuable in identification of intrauterine infection.
Insights
Microbial 16SrRNA gene detection can identify intrauterine infections, which may cause chorioamnionitis and lead to premature rupture of membranes (PROM) and preterm birth. This molecular method is valuable for diagnosing such infections.
Area of Science:
- Obstetrics and Gynecology
- Microbiology
- Neonatology
Context:
- Intrauterine infection is a significant factor in preterm birth.
- Chorioamnionitis, an infection of the fetal membranes and placenta, is frequently observed in preterm deliveries.
- Premature rupture of membranes (PROM) is a common complication associated with preterm birth.
Purpose:
- To investigate the association between microbial 16SrRNA gene presence and intrauterine infection.
- To determine the utility of detecting microbial genes, specifically 16SrRNA and Ureaplasma urealyticum (UU), in identifying intrauterine infections.
- To explore the relationship between chorioamnionitis, PROM, and preterm birth.
Summary:
- This study analyzed placental and fetal membrane samples from preterm birth cases and controls using Polymerase Chain Reaction (PCR).
- Chorioamnionitis was diagnosed in 70% of preterm birth cases, particularly in those with earlier gestational age or lower birth weight.
- Microbial 16SrRNA and UU genes were detected in preterm birth samples but not in controls, indicating a link between microbial presence and intrauterine infection.
Impact:
- The findings suggest that chorioamnionitis is a primary cause of PROM and preterm birth.
- Detection of microbial genes offers a valuable diagnostic tool for intrauterine infections.
- This research contributes to understanding the etiology of preterm birth and informs potential diagnostic strategies.
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