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Gene expression profiling in preterm infants: new aspects of bronchopulmonary dysplasia development
Jacek J Pietrzyk1, Przemko Kwinta, Embjorg J Wollen
1Department of Pediatrics, Jagiellonian University, Krakow, Poland.
Insights
Whole genome expression analysis in premature infants revealed significant gene expression alterations in those with bronchopulmonary dysplasia (BPD). Key pathways, including cell cycle and immune responses, were notably affected, highlighting BPD
Area of Science:
- Genomics
- Neonatology
- Molecular Biology
Background:
- Bronchopulmonary dysplasia (BPD) is a severe complication in premature infants.
- Microarray technology enables comprehensive gene expression analysis.
Purpose of the Study:
- Compare whole genome expression in infants with and without BPD during the first month of life.
- Identify gene expression patterns associated with BPD development.
Main Methods:
- Whole genome gene expression profiling using GeneChip® Human Gene 1.0 ST microarrays.
- Analysis of blood mRNA samples from 111 newborns (68 BPD, 43 control) on days 5, 14, and 28.
- Pathway enrichment analysis to identify affected biological pathways.
Main Results:
- Significant differential gene expression observed: 2086 genes on day 5, 324 on day 14, and 3498 on day 28.
- Cell cycle pathway was upregulated in the BPD group, independent of infant maturity.
- Four inflammatory response pathways were downregulated in the BPD group, influenced by immaturity and disease severity.
- T cell receptor signaling pathway was the most significantly downregulated.
Conclusions:
- Whole genome expression studies reveal substantial alterations in nearly 10% of the genome in infants with BPD.
- Identified pathways provide insights into the molecular mechanisms underlying BPD.
- Gene expression changes are linked to both prematurity and BPD severity.
Rationale:
Bronchopulmonary dysplasia is one of the most serious complications observed in premature infants. Thanks to microarray technique, expression of nearly all human genes can be reliably evaluated.
Objective:
To compare whole genome expression in the first month of life in groups of infants with and without bronchopulmonary dysplasia.
Methods:
111 newborns were included in the study. The mean birth weight was 1029 g (SD:290), and the mean gestational age was 27.8 weeks (SD:2.5). Blood samples were drawn from the study participants on the 5th, 14th and 28th day of life. The mRNA samples were evaluated for gene expression with the use of GeneChip® Human Gene 1.0 ST microarrays. The infants were divided into two groups: bronchopulmonary dysplasia (n=68) and control (n=43).
Results:
Overall 2086 genes were differentially expressed on the day 5, only 324 on the day 14 and 3498 on the day 28. Based on pathway enrichment analysis we found that the cell cycle pathway was up-regulated in the bronchopulmonary dysplasia group. The activation of this pathway does not seem to be related with the maturity of the infant. Four pathways related to inflammatory response were continuously on the 5(th), 14(th) and 28(th) day of life down-regulated in the bronchopulmonary dysplasia group. However, the expression of genes depended on both factors: immaturity and disease severity. The most significantly down-regulated pathway was the T cell receptor signaling pathway.
Conclusion:
The results of the whole genome expression study revealed alteration of the expression of nearly 10% of the genome in bronchopulmonary dysplasia patients.
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