A peer-reviewed mouse study links a cytoskeletal protein to the moving cell contacts that close the embryonic spinal neural tube. Closure slowed by about 30 per cent when early surface tissue lacked CFL1. Cellular protrusions became more persistent but less mobile, separating their abundance from their effectiveness in bringing the tissue edges together.
A single peer-reviewed experiment in mouse embryos found that CFL1, a protein involved in renewing the cell skeleton, contributes to spinal neural-tube closure. The neural tube develops from a flat sheet and gives rise to the brain and spinal cord. When early surface tissue lacked the protein, the advancing closure point moved about 30 per cent more slowly. Some embryos developed spina bifida, a defect in completing spinal closure.[1]
Live microscopy followed fine cellular projections as they explored the opposite tissue edge, touched it briefly and sometimes established more stable contacts. Without CFL1, these projections became more numerous and persisted longer, yet their angular movements decreased. Borders of certain cells at the joining point also narrowed less effectively. These observations distinguish the presence of protrusions from the changing movements and contacts that normally accompany progression of the embryonic zipper.[1]
The tissue still contained intercellular junction components and the cables that transmit force along its edge. Mechanical measurements did not identify a measurable loss of tension as the main explanation for slower closure. Researchers instead emphasized altered protrusion dynamics and cell-border constriction within an ordered sequence of behaviours. Imaging could not capture every step simultaneously, and closure differs between species. The findings concern mouse development and provide no clinically tested prevention for human neural-tube defects.[1]
