Leech embryogenesis

Source: Wikipedia, the free encyclopedia.

Leech embryogenesis is the process by which the embryo of the

actomyosin,[3] and by the end of stage 3 the AB cell divides. On stage 4 of development, the micromeres and teloblast stem cells are formed and subsequently, the D quadrant divides to form the DM and the DNOPQ teloblast precursor cells. By the end stage 6, the zygote contains a set of 25 micromeres, 3 macromeres (A, B and C) and 10 teloblasts derived from the D quadrant.[4]

The teloblasts are pairs of five different types (M, N, O, P, and Q) of embryonic stem cells that form segmented columns of cells (germinal band) in the surface of the embryo.

epidermis than O.[2] The sludgeworm Tubifex, unlike the leech, specifies the O and P lineages early in development and therefore, these two cells are not equipotent.[6] Each segment of the body of the leech is generated from one M, O, P cell types and two N and two Q cells types.[2]

The ectoderm and mesoderm of the body trunk are exclusively derived from the teloblast cells in a region called the posterior progress zone.[7][8] The head of the leech that comes from an unsegmented region, is formed by the first set of micromeres derived from A, B, C and D cells, keeping the bilateral symmetry between the AD and BC cells.[8]

References

  1. PMID 2295361
    .
  2. ^
    PMID 2869529
    .
  3. PMID 19607823
    .
  4. S2CID 46511971
    .
  5. PMID 8907161
    .
  6. PMID 11245587
    .
  7. PMID 7915671
    .
  8. ^
    PMID 9924777
    .
Retrieved from "https://en.wikipedia.org/w/index.php?title=Leech_embryogenesis&oldid=1170972407"