Is artificial life just a decade away?

In August 2007, an Associated Press article suggested that scientists were on the brink of creating artificial life, estimating it could happen within three to ten years. Is this feasible? Advances in decoding genomes, synthesizing DNA, and cloning have been remarkable, but creating functional artificial organisms represents a significant leap. However, researchers and companies pursuing this goal believe the 10-year timeline is achievable. They argue that the emergence of wet artificial life could profoundly reshape our understanding of biology and humanity's role in the universe.

While the claims about artificial life's imminent creation may seem bold, skeptics like Francis Collins, leader of the Human Genome Project, argue that a 10-year timeline is overly optimistic. Nevertheless, the idea of artificial life remains intriguing, and we delve into its possibilities in this article.

Wet artificial life refers to life forms constructed entirely from basic components, not modified or genetically engineered organisms. However, as discussed in our article on weird life, scientists lack a precise, universal definition of life. Despite this, biologists have identified key characteristics that artificial life must exhibit to be considered truly alive.

To qualify as artificial life, an organism must possess DNA or genetic material and the ability to reproduce, passing on its genetic code. It also requires a protective structure, like a cell wall, to house its genetic material and facilitate biological processes. This membrane must be permeable enough to absorb nutrients while blocking pathogens. Additionally, the organism must be self-sustaining, capable of consuming and metabolizing food, as well as repairing itself, adapting, and evolving over time.

Researchers face significant challenges in developing these traits. However, a Harvard scientist mentioned in the AP article predicted major breakthroughs in creating cell membranes by early 2007 [source: Associated Press]. Sustaining artificial life for more than a few hours remains difficult, but scientists aim to enhance these organisms once initial obstacles are addressed.

Some researchers propose assembling nucleotides, the building blocks of DNA, inside a cell casing to create genetic material. However, this process may require enzymes, potentially conflicting with the requirement of using only basic components to construct artificial life.

On the following page, we’ll explore additional challenges in creating artificial life and address a critical question: Could artificial life forms spiral out of control?

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Artificial Life Concerns and Challenges

Science fiction often portrays scenarios where machines, viruses, artificial organisms, or artificial intelligences spiral out of control. These fictional narratives highlight the potential risks of "playing God." However, some scientists argue that by the time artificial life is developed, robust control mechanisms will likely be established to manage such creations.

It's crucial to recognize that the diversity and complexity of life on Earth are the results of nearly four billion years of evolution. Even if artificial life is achieved within a decade, early synthetic organisms will likely be simple, consisting of just a few cells. The greater risk may lie in the misuse of genetic engineering to enhance the virulence or contagiousness of existing viruses.

Advocates of artificial life argue that creating synthetic organisms aligns with humanity's drive for progress and discovery. This research could provide valuable insights into fundamental biological processes. However, the negative portrayals of artificial life in science fiction have likely fueled public skepticism about its potential benefits.

Given the ongoing debate about what constitutes life and artificial life, we might encounter premature declarations of success from biologists. What truly counts as a breakthrough? Must it be a fully functional, complex, self-replicating organism, or would a basic piece of synthetic, self-replicating genetic material be enough? Additionally, how fundamental must the components used to create the organism be? Francis Collins argues that using enzymes, which originate from living organisms, would be "cheating" [source: PBS].

In a significant early achievement, researchers have successfully created artificial viruses. However, this was accomplished by replicating the DNA of existing viruses synthetically and introducing it into naturally occurring cells.

Once an artificial organism is developed, questions arise about its lifespan and survival conditions. Collins suggests that true artificial life should thrive in a basic environment, such as a simple sugar solution, without reliance on complex human-provided chemicals [source: PBS]. Others argue that even a short-lived microbe or organism, requiring extensive external control, could still be considered a milestone.

Initial claims about artificial life will undoubtedly face rigorous scrutiny. In the years ahead, the scientific community will continue to debate the definitions of both natural and synthetic life.