The plasticity of the mammalian transcriptome

Area of Science:

• Molecular Biology
• Genomics
• Transcriptomics

Background:

• The traditional view of RNA's role in molecular biology is limited to information transfer between DNA and proteins.
• Recent technological advancements have uncovered significant complexity within the mammalian transcriptome.
• A substantial portion of the genome, beyond the ~1.2% encoding proteins, is transcribed.

Purpose of the Study:

• To review the plasticity and dynamics of the mammalian transcriptome.
• To discuss the implications of transcriptome complexity on species complexity.
• To highlight the emerging understanding of non-coding RNA functions.

Main Methods:

• Review of recent literature and technological advancements in transcriptomics.
• Analysis of deep sequencing data.
• Examination of genomic loci for transcription patterns.

Main Results:

• The majority of nucleotides in the mammalian genome are expressed, not just protein-coding regions.
• >50% of genomic loci exhibit antisense and interleaved transcription.
• Numerous non-coding RNA species with novel functions have been identified, with many more likely to be discovered.

Conclusions:

• The mammalian transcriptome is highly dynamic and complex, challenging the dogma of RNA's limited role.
• Non-coding RNAs play crucial, yet under-investigated, regulatory roles.
• Understanding transcriptome complexity is essential for comprehending species complexity.