All articles tagged with #embryology
Canadian researchers show that Polycomb complexes PRC1 and PRC2 act as genetic brakes to silence early limb-formation genes at the right time, enabling later genetic programs to complete limb development; disrupting these systems in mice leads to improper gene expression and severe limb malformations, highlighting a fundamental principle of developmental regulation.
China sent stem-cell–derived embryo models (blastoids) to the Tiangong space station to study how the earliest stages of human development behave in microgravity. The experiment includes peri-implantation and peri-gastrulation models cultured for five days and then frozen for Earth-based analysis, with a ground-control batch for comparison. While it cannot prove humans can reproduce in space—blastoids are not real embryos and five days is a small window—it will provide concrete data on whether early development can tolerate off-Earth conditions and guide future research and engineering needs.
China’s Tianzhou‑10 cargo mission delivered roughly 7 tons of supplies to the Tiangong space station and carried two types of living stem‑cell–based “artificial embryos” to study early human development in microgravity. Representing 14–21 days after fertilization, the peri‑implantation and peri‑gastrulation embryos will be grown for about five days in orbit, then frozen and returned to Earth for analysis to assess how space radiation and zero gravity affect embryo development—an important step for potential off‑Earth reproduction—though the researchers emphasize these are embryo‑like and not viable human embryos.
A study using mosaic barcodes and cross-species experiments shows that sensory and sympathetic ganglia arise from distinct neural crest cells before they migrate, overturning decades of belief that cells decide their fate after leaving the neural tube. Most neural crest identities are pre-programmed inside the neural tube, with later migration following a tightly coordinated pattern. The findings have implications for congenital nerve disorders and childhood cancers, and emphasize the importance of early pregnancy health.
Scientists discovered large rectangular eggs of the Pacific white skate at about 3,500 meters beneath an active seafloor volcano off Vancouver Island. The geothermally heated water provides a gentle incubator that can accelerate embryo development in the cold, high-pressure deep sea, potentially shaving years from the lengthy incubation. The finding links volcanism to biodiversity, highlighting conservation needs for geothermal nurseries and offering new questions about how vent activity shapes reproductive success. Researchers used ROVs, high-def imagery, temperature readings, and geochemical data to map the thermal landscape where eggs cluster.
Researchers at a Windsor-area freshwater hatchery documented two Chinook salmon fry that are ventrally conjoined—sharing a single yolk sac and blood vessels while each having separate heads and tails—raising questions about the limits of twin development in fish. The finding underscores how tiny embryonic disruptions can produce such rare twins and highlights the need for careful hatchery monitoring to inform Great Lakes stocking and future research.
New research shows that growing tissues crack and reform through controlled, constructive fractures that sculpt embryos and organs—fluid-driven fractures between cells form cavities in mouse zygotes to create the blastocyst, fracture-guided formation of zebrafish heart trabeculae, and similar cracking patterns in elephant skin—revealing physics as a fundamental driver of development and evolution.
Using the European Synchrotron Radiation Facility's powerful X‑rays, researchers scanned a six‑egg clutch of Massospondylus carinatus embryos from 200‑million‑year‑old eggs found in South Africa, revealing tiny skulls and two distinct tooth generations—one temporary and shed before hatching, the other adult‑like—along with skeletal development consistent with two‑legged hatchlings and reptile–bird similarities.
Researchers studying sea anemones (cnidarians) show they use bilaterian-like bone morphogenetic protein (BMP) shuttling to set body axes, suggesting this developmental mechanism predates the cnidarian–bilaterian split 600–700 million years ago and may reflect an ancient shared blueprint for animal body plans.
This week in science news, a giant alligator weighing 920 pounds and measuring 30 feet in length was caught in Florida, while an asteroid called Dimorphos is behaving unexpectedly after being intentionally hit by a rocket during a NASA mission. Other highlights include the discovery of a gene variant that may guard against Alzheimer's and Parkinson's, the growth of human kidneys inside pig embryos, and the unveiling of mysterious "alien" bodies in Mexico's congress. In archaeology, a 4,000-year-old Canaanite arch in Israel and 7,000-year-old animal bones in Arabia were found, and divers recovered a U.S. airman's remains from a WWII bomber wreck near Malta. Additionally, the mysterious henon bamboo that flowers once every 120 years baffles scientists.