FuChi reveals cell division alongside movement in chicken embryos
Researchers developed FuChi, a fluorescent chicken line that distinguishes stages of the cell cycle while cells move through developing embryos. A single peer-reviewed experimental study tested the system in cells and living early embryos, adding a way to track proliferation alongside tissue formation. The tool also works in fixed tissue, although later developmental stages need further validation and some adult birds showed adverse effects.
Science··Morning
Fluorescent cells reveal movement and proliferation
FuChi, a chicken line carrying fluorescent cell-cycle markers, lets researchers follow proliferation while cells move through a developing embryo. In a single peer-reviewed experimental study, early migrating primordial germ cells—the precursors of reproductive cells—were predominantly in G1. During gastrulation, when the embryo establishes its tissue layers, cells leaving the primitive streak changed cycle stage as they migrated. The association leaves a causal link with cell fate unresolved.[1]
Colours separate the stages of division
The system links fluorescent tags to proteins degraded at different times. G1 cells carry a red marker and S-phase cells a green marker, while G2 and M carry both. A tag on histone H1.0, a chromosome-associated protein, reveals chromosome condensation during mitosis and helps identify M phase. Images taken every 8–10 minutes with light-sheet microscopy followed cells on the embryo surface; early tracked cells had cycles lasting about 10 hours.[1]
The reporter passes from cells into a chicken line
Researchers introduced the genetic construct into chicken cells using piggyBac, a gene-integration system. Recipient embryos received the modified primordial germ cells. The next breeding stage paired males from these embryos with wild-type hens. Reporter signals were checked by flow cytometry and live imaging. Poor body condition in some adult birds raised concerns about the biosensor and the position at which it entered the genome.[1]
The markers also worked in frozen sections and paraffin-embedded tissue. Early embryos supplied the extensive live tests; later stages and rapidly moving tissues require further validation. DNA damage can also affect reporter behaviour.[1]
