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Neurotransmission Sex Dichotomy in the Rat Hypothalamic Paraventricular Nucleus in Healthy and Infantile Spasm Model
Dumitru Andrei Iacobas1, Jana Veliskova2, Tamar Chachua3
1Personalized Genomics Laboratory, Undergraduate Medical Academy, School of Public and Allied Health, Prairie View A&M University, Prairie View, TX 77446, USA.
Insights
This study explored sex differences in gene expression within the rat hypothalamus, revealing distinct genomic patterns in infantile spasms. These findings offer molecular insights into sex-based variations in infantile epilepsy spasm syndrome development.
Area of Science:
- Neuroscience
- Genomics
- Developmental Biology
Background:
- Infantile spasms (IS) are a severe epilepsy syndrome with unclear sex-based differences in underlying mechanisms.
- The hypothalamic paraventricular nucleus (PVN) plays a role in neurodevelopment and stress response, potentially influencing IS.
- Understanding sex-specific gene expression in the PVN could elucidate differential IS susceptibility and progression.
Purpose of the Study:
- To investigate sex-based dichotomies in neurotransmission genomic profiles within the PVN of a rat model of infantile spasms.
- To identify sex-specific transcriptomic features related to gene expression, regulation, and co-expression in the context of infantile spasms.
Main Methods:
- Utilized a standard rat model of infantile spasms induced by prenatal betamethasone and postnatal N-methyl-D-aspartic acid.
- Analyzed publicly available microarray data from male and female rat pups.
- Characterized gene expression using average expression levels, transcript abundance control, and inter-gene expression correlation.
Main Results:
- Identified significant sex differences in gene expression levels within the PVN.
- Observed substantial sex-based variations in the control of transcript abundance.
- Revealed notable sex disparities in the inter-coordination of gene expression.
Conclusions:
- Substantial sex differences exist in the genomic landscape of the hypothalamic PVN in infantile spasms.
- These transcriptomic variations provide a molecular basis for observed sex differences in infantile epilepsy spasm syndrome.
- The findings contribute to understanding the sex dichotomy in the development and presentation of infantile spasms.
Abstract:
We profiled the gene expressions in the hypothalamic paraventricular nuclei of 12 male and 12 female pups from a standard rat model of infantile spasms to determine the sex dichotomy of the neurotransmission genomic fabrics. Infantile spasms were triggered in rat pups prenatally primed with two doses of betamethasone followed by the postnatal repeated administration of N-methyl-D-aspartic acid to induce spasms. Publicly available microarray data were used to characterize each gene in each condition for both sexes by the independent transcriptomic features: average expression level, control of the transcript abundance, and expression correlation with every other gene. This study revealed substantial sex differences in the expression level, control, and inter-coordination of the investigated genes among the studied groups. The transcriptomic differences assist in providing a molecular explanation of the behavioral differences and development of infantile epilepsy spasm syndrome in the two sexes.
