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Sex differences in gene expression of developing fetal brain in pig

ABSTRACT: Sex differences in gene expression of developing fetal brain in pig

PROVIDER: PRJNA741772 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR14924058_1.fastq.gz	Fastqsanger.gz
	SRR14924058_2.fastq.gz	Fastqsanger.gz
	SRR14924059_1.fastq.gz	Fastqsanger.gz
	SRR14924059_2.fastq.gz	Fastqsanger.gz
	SRR14924060_1.fastq.gz	Fastqsanger.gz

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Sex differences in gene expression of developing fetal brain in pig

Project description:In this study, gene expression was profiled by RNA-seq to examine whole transcriptome of the male and female fetal brain of domesticated pig on the three gestation days 45, 60 and 90. Gene expression in fetal brain was distinct on day 90 compared to days 45 and 60. The homeobox genes were consistently upregulated in the brain of females compared to males during development. The sex of adjacent fetuses influenced gene expression of fetal brain. Extensive exon-level expression changes in the developing brains was observed. Pathway enrichment analysis showed that the ionotropic glutamate receptor pathway and p53 pathway were enriched in female brain only whereas receptor mediated signaling pathways were enriched in the male brain alone. Genes that are known markers of neurons and astrocytes were differentially regulated in male and female brain during development. The study further suggests that regulation of ion transportation via placental matrotrophy may play a role in fetal brain development.

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Project description:DNA methylation plays crucial roles during fetal development as well as aging. Whether the aging of the brain is programmed at the fetal stage remains untested. To test this hypothesis, mouse epigenetic clock (epiclock) was profiled in fetal (gestation day 15), postnatal (day 5), and aging (week 70) brain of male and female C57BL/6J inbred mice. Data analysis showed that on week 70, the female brain was epigenetically younger than the male brain. Predictive modeling by neural network identified specific methylations in the brain at the developing stages that were predictive of epigenetic state of the brain during aging. Transcriptomic analysis showed coordinated changes in the expression of epiclock genes in the fetal brain relative to the placenta. Whole-genome bisulfite sequencing identified sites that were methylated both in the placenta and fetal brain in a sex-specific manner. Epiclock genes and genes associated with specific signaling pathways, primarily the gonadotropin-releasing hormone receptor (GnRHR) pathway, were associated with the sex-bias methylations in the placenta as well as the fetal brain. Transcriptional crosstalk among the epiclock and GnRHR pathway genes was evident in the placenta that was maintained in the brain during development as well as aging. Collectively, these findings suggest that sex differences in the aging of the brain are of fetal origin and epigenetically linked to the placenta.

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