For The First Time, Scientists Say They've Built a Synthetic Cell From Scratch

Scientists from the University of Minnesota say they have created the first-ever synthetic cell built entirely from scratch, and seen it go through an entire 'life' cycle – including reproduction. "This is the most fascinating and important thing I've ever done in my work, and the realization that it's actually happening was rather slow to sink in," synthetic biologist Kate Adamala, a co-lead on the project told ScienceAlert. "We've replicated in chemistry what only used to be possible in biology: the complete set of behaviors of a cell. It proves that the most fundamental functions of life, like growth and replication, do not need a mysterious magical spark," she says. The project is called SpudCell, and it has a genome of just 90 kilobase pairs (kbp). For comparison, the human genome is about 3 million kpb, and biologists previously assumed that a living cell would require at least 113 kpb of genetic data to function properly. According to Adamala and her colleagues, SpudCell appears to stretch these limits, though their research is yet to be formally published and has not been peer-reviewed. But it has been shared on the website of a new nonprofit bioengineering institution Adamala has helped found, Biotic. When Adamala first saw the result, she was in shock. "I was very happy, relieved, and a bit suspicious because I'm always double- and triple-checking results," she told ScienceAlert. "By the time all the controls and their controls and additional controls were done, it wasn't a surprise anymore." According to Science magazine, SpudCell has met some hurdles in publication: apparently one reviewer at Cell, a prestigious science journal, said the project was not real biology. That might be partially because SpudCell doesn't quite meet the requirements for real 'life': it can't replicate itself over many generations, and so it also can't evolve. "I think biologists might not appreciate the significance of the chemical engineering simplicity of minimal cell," Adamala explained to ScienceAlert. 'SpudCell doesn't look like much if you're grading it on the scale of natural biological systems: it's a very slow growth and replication cycle, and high-demand metabolism." Each artificial SpudCell consists of a liposome – a sphere of fats that mimics the outer membrane of a real cell – wrapped around seven plasmids, small units of DNA (often found in bacteria) that are a bit different from the chromosomes you might be familiar with. Together, these seven plasmids make up the SpudCell genome, all 90 kbp of it. The 'cell' is also equipped with an in-built 'protein expression system', which translates the DNA's genetic instructions into action. That's what allows the 'cell' to turn the nutrients it absorbs from the surrounding liquid into useful materials, and enables cell division. According to the researchers, the SpudCell system is capable of "selection, genome replication, growth, resource acquisition via feeding, and genetically encoded division." You might be wondering, why do scientists want to make artificial cells from scratch in the first place? Aside from probing the fundamental question of where the threshold for life really sits, future synthetic cell-like systems could potentially be designed to act like mini biological factories, pumping out organic materials such as drugs, biomaterials, chemicals, and other useful stuff. Labs already use genetically modified bacteria and other microbes in this way, and it's also similar to how medical-grade insulin is produced. A fully synthetic cell may allow for efficiencies and specificities that surpass existing biotechnologies. They may also prove less helpful than nature's own designs. Currently, SpudCells don't last more than a few generations. They can't actually produce their own protein expression system, nor can they regulate their metabolism, so they rely entirely on substances and components in the liquid medium in which they float. The blobs also lack a cytoskeleton, the internal scaffolding that props up natural cells. This simplifies things, but it also means they can't shuttle materials around or clear waste. But this work does provide a proof of concept that other scientists can build on – and that we'll keep a close eye on in the coming years. Related: Scientists Have Just Created The Most Synthetic Life Form Ever "Our goal is to have full operational ability to engineer biology," Adamala told ScienceAlert. "To do that, we need to know where every building block goes, we need a full blueprint. That is what SpudCell gives, and no other currently known cell. We have complete schematics of it, so we can engineer on that chassis." "I hope others will expand on this chassis to add more robust division (somebody put in a cytoskeleton please!), and add more robust metabolic pathways," she added. "Then I'll take a year long vacation or something else crazy to celebrate." The research has not yet been peer-reviewed, but a preprint is available on Biotic's website. This article was fact-checked by Rebecca Dyer and edited by Clare Watson. While we pride ourselves on our process, we are only human. If you spot a mistake, please let us know.