New Proposal Suggests Life Emerged in a Slimy Gel Matrix

There are numerous theories proposed by scientists regarding how Earth’s raw materials evolved into living cells. However, a recent and intriguing proposal suggests that life may have originated within a sticky goo adhering to a rock long before the existence of true cells.

According to an international team of researchers, similar to the bacterial biofilms we witness today on various surfaces, a semi-solid gel matrix could have provided an ideal environment for life to initiate, not only on Earth but potentially on other planets as well. This unconventional theory challenges the conventional idea that the first organic chemistry occurred in water, rather than in a gel-like substance.

The primary focus of many origin-of-life theories revolves around the function of biomolecules and biopolymers. However, this new theory emphasizes the role of gels at the genesis of life. Astrobiologist Tony Jia from Hiroshima University states that while existing theories concentrate on biomolecules, their theory incorporates the significance of gels in the origin of life.

The concept of life emerging within a gel medium offers a plausible explanation for the transformation of simple molecules into complex entities like RNA and DNA without additional support. The gel environment could address multiple challenges faced by pre-life chemistry simultaneously.

During the early stages of Earth, the environment was harsh with intense ultraviolet radiation and extreme temperatures. The researchers suggest that prebiotic gels could have offered essential protection to the delicate chemistry of life before the development of membrane-bound cells.

Contrary to common belief, the theory proposes that protocells were not the initial phase in the origin of life but rather the result of chemical organization within the primordial goo. The researchers outline a prebiotic gel-first framework where early life could have emerged within surface-attached gel matrices.

The researchers suggest that in these early gels, the groundwork for metabolism could have been laid as chemicals engaged in electron exchange. Additionally, ultraviolet light penetrating the gel could have supplied extra energy for chemical reactions, akin to photosynthesis in plants.

Gels have the ability to concentrate monomers like activated nucleotides and amino acids and selectively retain and interact with specific chemicals, facilitating the formation of polymers. This shift in perspective broadens the scope of the search for extraterrestrial life, indicating that structures such as gels could be potential indicators of life beyond Earth.

The study was published in ChemSystemsChem.