María Cernada1, Eva Serna2, Christine Bauerl3, María Carmen Collado3, Gaspar Pérez-Martínez3, Máximo Vento4. 1. Health Research Institute (Instituto de Investigación Sanitaria) La Fe, Valencia, Spain; Division of Neonatology, University and Polytechnic Hospital, Valencia, Spain; 2. Central Research Unit-INCLIVA, Faculty of Medicine, University of Valencia, Spain; and. 3. Department of Biotechnology, Instituto de Agroquímica y Tecnología de Alimentos, Consejo Superior de Investigaciones Científicas, Valencia; Spain. 4. Health Research Institute (Instituto de Investigación Sanitaria) La Fe, Valencia, Spain; Division of Neonatology, University and Polytechnic Hospital, Valencia, Spain; maximo.vento@uv.es.
Abstract
BACKGROUND: Bacterial sepsis is associated with high morbidity and mortality in preterm infants. However, diagnosis of sepsis and identification of the causative agent remains challenging. Our aim was to determine genome-wide expression profiles of very low birth weight (VLBW) infants with and without bacterial sepsis and assess differences. METHODS: This was a prospective observational double-cohort study conducted in VLBW (<1500 g) infants with culture-positive bacterial sepsis and non-septic matched controls. Blood samples were collected as soon as clinical signs of sepsis were identified and before antibiotics were initiated. Total RNA was processed for genome-wide expression analysis using Affymetrix gene arrays. RESULTS: During a 19-month period, 17 septic VLBW infants and 19 matched controls were enrolled. First, a three-dimensional unsupervised principal component analysis based on the entire genome (28 000 transcripts) identified 3 clusters of patients based on gene expression patterns: Gram-positive sepsis, Gram-negative sepsis, and noninfected control infants. Furthermore, these groups were confirmed by using analysis of variance, which identified a transcriptional signature of 554 of genes. These genes had a significantly different expression among the groups. Of the 554 identified genes, 66 belonged to the tumor necrosis factor and 56 to cytokine signaling. The most significantly overexpressed pathways in septic neonates related with innate immune and inflammatory responses and were validated by real-time reverse transcription polymerase chain reaction. CONCLUSIONS: Our preliminary results suggest that genome-wide expression profiles discriminate septic from nonseptic VLBW infants early in the neonatal period. Further studies are needed to confirm these findings.
BACKGROUND: Bacterial sepsis is associated with high morbidity and mortality in preterm infants. However, diagnosis of sepsis and identification of the causative agent remains challenging. Our aim was to determine genome-wide expression profiles of very low birth weight (VLBW) infants with and without bacterial sepsis and assess differences. METHODS: This was a prospective observational double-cohort study conducted in VLBW (<1500 g) infants with culture-positive bacterial sepsis and non-septic matched controls. Blood samples were collected as soon as clinical signs of sepsis were identified and before antibiotics were initiated. Total RNA was processed for genome-wide expression analysis using Affymetrix gene arrays. RESULTS: During a 19-month period, 17 septic VLBW infants and 19 matched controls were enrolled. First, a three-dimensional unsupervised principal component analysis based on the entire genome (28 000 transcripts) identified 3 clusters of patients based on gene expression patterns: Gram-positive sepsis, Gram-negative sepsis, and noninfected control infants. Furthermore, these groups were confirmed by using analysis of variance, which identified a transcriptional signature of 554 of genes. These genes had a significantly different expression among the groups. Of the 554 identified genes, 66 belonged to the tumor necrosis factor and 56 to cytokine signaling. The most significantly overexpressed pathways in septic neonates related with innate immune and inflammatory responses and were validated by real-time reverse transcription polymerase chain reaction. CONCLUSIONS: Our preliminary results suggest that genome-wide expression profiles discriminate septic from nonseptic VLBW infants early in the neonatal period. Further studies are needed to confirm these findings.
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Authors: Timothy E Sweeney; James L Wynn; María Cernada; Eva Serna; Hector R Wong; Henry V Baker; Máximo Vento; Purvesh Khatri Journal: J Pediatric Infect Dis Soc Date: 2018-05-15 Impact factor: 3.164
Authors: María Cernada; Alejandro Pinilla-González; Julia Kuligowski; José Manuel Morales; Sheila Lorente-Pozo; José David Piñeiro-Ramos; Anna Parra-Llorca; Inmaculada Lara-Cantón; Máximo Vento; Eva Serna Journal: Pediatr Res Date: 2021-03-25 Impact factor: 3.756
Authors: Sheila Lorente-Pozo; Paula Navarrete; María José Garzón; Inmaculada Lara-Cantón; Jesús Beltrán-García; Rebeca Osca-Verdegal; Salvador Mena-Mollá; Eva García-López; Máximo Vento; Federico V Pallardó; José Luis García-Giménez Journal: Front Immunol Date: 2021-02-15 Impact factor: 7.561