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Updated: Jul 17, 2026
Modifying Levels of Maternal Dietary Folic Acid or Choline to Study the Impact of Deficiencies on Offspring Health Outcomes
Published on: June 28, 2024
Prenatal choline availability modulates hippocampal and cerebral cortical gene expression
Tiffany J Mellott1, Maximillian T Follettie, Veronica Diesl
1Department of Pathology and Laboratory Medicine, Boston University School of Medicine, 715 Albany St., Boston, MA 02118, USA.
Insights
Prenatal choline supplementation enhances memory long-term by altering gene expression in developing rat brains. Choline deficiency during fetal development impairs memory, with transient gene expression changes observed.
Area of Science:
- Neuroscience
- Developmental Biology
- Nutritional Science
Background:
- Choline is an essential nutrient vital for fetal development.
- Prenatal choline availability influences cognitive functions, including memory.
- Specific developmental windows (embryonic day 11-17) are critical for choline's effects.
Purpose of the Study:
- To investigate the molecular mechanisms underlying choline's effects on brain development and memory.
- To analyze changes in gene expression in response to prenatal choline supply or deficiency.
- To identify specific genes and signaling pathways affected by in utero choline availability.
Main Methods:
- Oligonucleotide microarray analysis of brain mRNA expression in rats.
- Reverse transcriptase-polymerase chain reaction (RT-PCR) for gene expression verification.
- Immunoblot analysis to confirm protein expression changes.
Main Results:
- Prenatal choline supplementation and deficiency induced transient alterations in gene expression, primarily during postnatal days 15-34.
- Supplemented rats showed higher expression of CaMK I, IGF II, and Zif268/EGR1.
- Deficient rats exhibited higher expression of CaMKIIbeta, protein kinase Cbeta2, and GABA(B) receptor isoforms.
Conclusions:
- Prenatal choline availability significantly modifies developmental gene expression patterns in the brain.
- These molecular changes provide correlates for observed cognitive effects on learning and memory.
- The study highlights the critical role of in utero choline supply for long-term cognitive health.
Abstract:
An increased supply of the essential nutrient choline during fetal development [embryonic day (E) 11-17] in rats causes life-long improvements in memory performance, whereas choline deficiency during this time impairs certain aspects of memory. We analyzed mRNA expression in brains of prenatally choline-deficient, choline-supplemented, or control rats of various ages [postnatal days (P) 1 to 34 for hippocampus and E16 to P34 for cortex] using oligonucleotide microarrays and found alterations in gene expression levels evoked by prenatal choline intake that were, in most cases, transient occurring during the P15-P34 period. We selected a subset of genes, encoding signaling proteins, and verified the microarray data by reverse transcriptase-polymerase chain reaction analyses. Prenatally choline-supplemented rats had the highest expression of calcium/calmodulin (CaM)-dependent protein kinase (CaMK) I and insulin-like growth factor (IGF) II (Igf2) in the cortex and of the transcription factor Zif268/EGR1 in the cortex and hippocampus. Prenatally choline deficient rats had the highest expression of CaMKIIbeta, protein kinase Cbeta2, and GABA(B) receptor 1 isoforms c and d in the hippocampus. Similar changes in the expression of the proteins encoded by these genes were observed using immunoblot analyses. These data show that the prenatal supply of choline causes multiple modifications in the developmental patterns of expression of genes known to influence learning and memory and provide molecular correlates for the cognitive changes evoked by altered availability of choline in utero.
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