Transcriptome map of mouse isochores in embryonic and neonatal cortex

Area of Science:

• Genomics
• Developmental Biology
• Gene Expression Analysis

Background:

• Studies indicate genomic and genic base composition positively affect mammalian gene expression in adult tissues.
• Emerging research suggests GC-poor genomic regions play a preferential role during developmental processes.

Purpose of the Study:

• To investigate the relationship between isochore compositional properties and gene expression activity during mammalian development.
• To create a developmental-related transcriptome map of mouse isochores.
• To analyze the correlation between GC levels and expression activity across isochores and genes during development.

Main Methods:

• Utilized RNA-sequencing (RNA-seq) data from mouse cortex at embryonic day 18 (E18) and postnatal day 7 (P7).
• Established a developmental transcriptome map of mouse isochores.
• Estimated correlations between isochore GC levels, gene expression activity, and gene expression patterns within isochore families for each developmental stage.

Main Results:

• Confirmed that GC-poor isochores are preferentially implicated during developmental processes.
• Reaffirmed the positive correlation between a gene's GC level and its expression activity.
• Provided a novel developmental-related transcriptome map of mouse isochores.

Conclusions:

• Developmental processes in mammals show a preference for GC-poor genomic regions.
• Gene composition, specifically GC content, remains a significant positive predictor of gene expression during development.
• The study provides new insights into the genomic underpinnings of mammalian development.