Transcriptome of embryonic and neonatal mouse cortex by high-throughput RNA sequencing

Area of Science:

• Neuroscience
• Genomics
• Developmental Biology

Background:

• Early brain development involves significant structural and functional changes.
• Limited gene expression data exists for critical embryonic and early postnatal stages.
• Understanding gene expression is crucial for deciphering neural circuit formation and developmental disorders.

Purpose of the Study:

• To comprehensively profile mRNA expression in the mouse cortex during early development (embryonic day 18 vs. postnatal day 7).
• To identify differentially expressed genes and alternative splice variants critical for brain development.
• To provide a foundational transcriptome dataset for future research on neural development and disease.

Main Methods:

• High-throughput sequencing (RNA-Seq) to generate over 27 million reads.
• Analysis of gene expression in mouse cortex at embryonic day 18 (E18) and postnatal day 7 (P7).
• Development of strategies to detect alternative splicing and uncover splice variants.

Main Results:

• Identified expression patterns for over 16,000 genes.
• Observed differential expression in 3,758 genes between E18 and P7.
• Found neurogenesis genes (e.g., Sox4, Sox11) higher at E18, while synaptic genes (e.g., synaptotagmin) increased by P7.
• Detected elevated expression of several neurological disorder-related genes at E18.

Conclusions:

• The study provides a detailed transcriptome map of early mouse brain development.
• Differential gene expression highlights distinct molecular programs for neurogenesis and synaptogenesis.
• Findings offer valuable insights into gene functions during neural development and potential links to neurological disorders.