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Related Concept Videos

Ribosomal RNA Synthesis02:53

Ribosomal RNA Synthesis

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Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
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Related Experiment Video

Updated: Mar 26, 2026

Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis
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Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis

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The RNA World: 4,000,000,050 years old.

Niles Lehman1

  • 1Department of Chemistry, Portland State University, PO Box 751, Portland OR 97207, USA. niles@pdx.edu.

Life (Basel, Switzerland)
|January 22, 2016
PubMed
Summary

The RNA World hypothesis, proposed 50 years ago, suggests RNA preceded DNA and proteins. This theory explores early life

Area of Science:

  • Origin of Life studies
  • Biochemistry
  • Molecular Evolution

Background:

  • The RNA World hypothesis posits that RNA served as both genetic material and catalytic molecules before DNA and proteins.
  • Understanding the transition from an RNA-based to a DNA/protein-based system is crucial for comprehending early life evolution.

Purpose of the Study:

  • To explore the historical development and scientific validation of the RNA World hypothesis.
  • To discuss the implications of RNA's dual role in early biological systems.
  • To highlight recent advancements and ongoing research in RNA World studies.

Main Methods:

  • Review of historical scientific literature on the origins of life.
  • Analysis of experimental evidence supporting RNA's catalytic and genetic capabilities.

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  • Comparative genomics and bioinformatics to infer early molecular functions.

    • Main Results:

    • The RNA World hypothesis has been a cornerstone in origin of life research for five decades.
    • Experimental evidence increasingly supports RNA's potential for both information storage and enzymatic activity.
    • Ongoing research continues to refine our understanding of RNA's role and the subsequent emergence of DNA and proteins.

    Conclusions:

    • The RNA World remains a leading framework for understanding the emergence of life.
    • Further research is essential to fully elucidate the transition to the modern DNA/protein-based system.
    • The study of RNA's ancient functions provides critical insights into fundamental biological processes.