Evolutionary relationship between nonmammalian and mammalian peptides

Area of Science:

• Evolutionary biology
• Biochemistry
• Molecular biology

Background:

• Regulatory peptides are crucial signaling molecules involved in various physiological processes.
• Their evolutionary origins and conservation across diverse species remain areas of active research.
• Understanding peptide evolution sheds light on fundamental biological mechanisms.

Purpose of the Study:

• To propose a hypothesis for the evolution of regulatory peptides.
• To investigate the conservation of peptide sequences and functions throughout evolution.
• To explore the relationship between peptide regulators, their receptors, and processing enzymes.

Main Methods:

• Development of a hypothesis for peptide evolution.
• Comparative analysis of peptide sequences across different species (unicellular organisms, amphibians, mammals).
• Utilizing radioimmunoassays and antisera to identify conserved peptide sequences and functions.

Main Results:

• Peptides likely originated as proteolytic by-products of protein precursors, acquiring hormonal roles via natural selection.
• Specific peptide sequences have been conserved across evolutionarily distant species, indicating essential biological functions.
• Amphibian peptide sequences (physalaemin, bombesin) show significant homology and functional mimicry in mammals, confirmed by radioimmunoassays.

Conclusions:

• Regulatory peptides evolved from nutritional precursors and gained hormonal status through natural selection.
• Conserved peptide sequences underscore their fundamental importance for species survival.
• Radioimmunoassays are effective tools for identifying evolutionarily conserved peptide sequences and functions.