Genetics first or metabolism first? The formamide clue.

Area of Science:

• Astrobiology and Origin of Life Research
• Prebiotic Chemistry and Molecular Evolution
• Biochemistry and Systems Chemistry

Background:

• Life's intricate processes arise from the interplay of metabolism and genetics, rooted in fundamental elements like carbon, hydrogen, oxygen, and nitrogen.
• The quest for life's origin has historically been divided between 'genetics-first' and 'metabolism-first' hypotheses.
• Recent advances integrate energetic, evolutionary, and environmental factors, but a simple, unitary chemical framework for both genetic and metabolic precursors is still needed.

Purpose of the Study:

• To propose a common chemical origin for both (pre)genetic and (pre)metabolic pathways.
• To identify a single, simple chemical system capable of generating precursors for RNA and central metabolic cycles.
• To explore the potential role of formamide in prebiotic synthesis.

Main Methods:

• Review and synthesis of existing theoretical and experimental data on prebiotic chemistry.
• Analysis of formamide's chemical properties and its capacity to yield diverse organic molecules.
• Conceptual framework integrating formamide's role within a unitary origin-of-life scenario.

Main Results:

• Formamide chemistry, under simple physical-chemical conditions, can generate a wide array of essential prebiotic molecules.
• These molecules include nucleic acid bases, acyclonucleosides, nucleotides, carboxylic acids, sugars, amino sugars, and amino acids.
• Formamide also yields condensing agents, crucial for polymerization reactions.

Conclusions:

• Formamide presents a plausible, single chemical framework that could have provided the foundational components for both early genetic and metabolic systems.
• This unified approach supports the hypothesis of a common origin for metabolism and genetics.
• While formamide chemistry explains the availability of organic substrates, further research is needed to address the systemic chemical level of origin-of-life processes.