Characterization of gene expression changes over healthy term pregnancies

Area of Science:

• Reproductive biology
• Genomics
• Immunology

Background:

• Pregnancy involves significant physiological adaptations.
• Limited data exists on how gene expression changes throughout pregnancy.
• Understanding these changes is crucial for monitoring pregnancy health.

Purpose of the Study:

• To characterize the dynamic changes in the human transcriptome during healthy pregnancy.
• To identify specific genes and pathways that are altered with gestational progression.
• To lay the groundwork for identifying gene expression patterns associated with pregnancy complications.

Main Methods:

• Peripheral blood mononuclear cells (PBMCs) were collected from 63 women at two time points: early (6-15 weeks) and late (22-33 weeks) gestation.
• RNA was extracted from PBMCs, and gene expression was analyzed using transcriptomic profiling.
• Statistical analysis, including Bonferroni correction, was applied to identify significant changes in gene expression over pregnancy.

Main Results:

• Out of 16,311 transcripts analyzed, 439 showed significant changes over the course of pregnancy.
• Genes with increased expression were predominantly associated with oxygen transport, immune system function, and bacterial infection response.
• These findings highlight dynamic molecular adaptations occurring in maternal blood cells during gestation.

Conclusions:

• The maternal transcriptome undergoes significant, measurable changes throughout healthy pregnancy.
• Specific gene expression patterns related to immunity and oxygen transport are altered as pregnancy progresses.
• Characterizing these normal changes may help in developing predictive markers for adverse pregnancy outcomes.