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“Synthetic human embryos” have been transported into orbit for the very first time. These pioneering structures, composed of living stem cells, reached China’s Tiangong space station on May 11 and are slated for return to Earth shortly thereafter.(Image credit: Main: CNSA; insert: Jim Dyson via Getty Images)Share this article 0Join the conversationFollow usAdd us as a preferred source on GoogleSubscribe to our newsletter
China has taken the lead in dispatching “synthetic human embryos” into space, aiming to gain a deeper understanding of how reduced gravity and cosmic radiation might impact human conception. The findings could significantly influence our prospects for establishing independent settlements on the moon and Mars.
These embryo-like formations, cultivated from viable human stem cells, arrived at the Tiangong (“Heavenly Palace”) space station in the early hours of May 11, as part of the Tianzhou-10 resupply mission, according to state authorities. The mission also supplied approximately 7 tons (6.3 metric tons) of provisions, including sustenance, propellant, protective suits, and additional scientific payloads, to the Chinese taikonauts currently residing on the station.
The Tianzhou-10 spacecraft, analogous to the cargo vessels servicing the International Space Station (ISS), departed from the Wenchang Space Launch Site roughly five hours earlier, at 8:14 p.m. EDT on May 10, as reported by Space.com, a sister publication to Live Science.
Stem cells in orbit
The artificial embryos are comprised of stem cell clusters possessing the capacity to replicate and proliferate akin to a natural embryo, yet lack the ability to mature into a fetus or infant, thereby enabling researchers to conduct their investigations with reduced ethical quandaries.
“This is not a genuine human embryo and lacks the potential for individual development,” stated Leqian Yu, a researcher at the Institute of Zoology, Chinese Academy of Sciences (CAS), who is spearheading the project, in a CAS press release on May 14. “Nevertheless, it can function as a model for examining early human gestation.”
For this research, two distinct categories of synthetic embryos were utilized, representing different developmental stages between 14 and 21 days post-fertilization. The initial type is a peri-implantation model, which simulates the crucial phase where an embryo anchors to the uterine lining. The subsequent type is a peri-gastrulation model, replicating the developmental point at which a single cell layer differentiates into distinct layers that will ultimately form various tissues and organs.
The Tianzhou-10 mission delivered over 200 distinct items to the Tiangong Space Station, according to Space.com.
(Image credit: CMSEO)
The synthetic embryos will be permitted to mature for five days before being cryogenically preserved and subsequently brought back to Earth for examination. “The experiment is progressing very favorably,” Yu remarked in the statement. (By this point, the embryos have likely already been placed on ice.)
Concurrently with the development of the embryos in space, researchers in China cultivated and froze identical synthetic embryos, which will serve as the baseline for comparison in the experiment. “Our objective is that by contrasting the development of space-borne and terrestrial samples, we can pinpoint the variables influencing early human embryonic growth within the space environment, and address the hazards and obstacles that humankind may encounter during prolonged space habitation,” Yu explained.
Comparable investigations involving zebrafish embryos and mouse embryos were also dispatched aboard Tianzhou-10.
Making babies in space
The capacity for reproduction in space will be indispensable for humanity to establish a lasting presence on the moon, Mars, and other celestial bodies. However, several hurdles must be surmounted before this becomes feasible, assuming it is achievable at all.
Scholars have cautioned that as space tourism gains wider acceptance, individuals other than professional astronauts might engage in sexual activity in space, potentially leading to conceptions off-world.
Prior studies have suggested that elevated radiation levels in space could imperil developing embryos, while the absence of gravity is also anticipated to pose a significant impediment.
Yu informed state-run media that the artificial embryos “were brought to space to explore whether life, which has evolved under gravity for hundreds of millions of years, is affected by its sudden absence.”
The Tianzhou-10 cargo vessel was launched from China’s Wenchang Space Launch Site atop a Long March 7 rocket on May 10.
(Image credit: Luo Yunfei/China News Service/VCG via Getty Images)
Investigating the earliest phases of embryonic development will be particularly vital in assessing the feasibility of natural procreation under these environmental conditions. This period represents “a critical window in early human development, during which the foundational elements for future organs begin to form, and the entire body axis — which dictates the head and the tail — is established,” Yu communicated to state-controlled media outlets.
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A recent study indicated that microgravity might disorient spermatozoa, thereby reducing the likelihood of egg fertilization. Furthermore, it has been recognized for some time that stem cells age considerably faster in space compared to Earth, which could also present a substantial issue.
Considering these difficulties, it may become necessary to resort to in vitro fertilization techniques to assist in the gestation of offspring in space, a concept already under exploration by several private space ventures.
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