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Related Experiment Videos

Segmentation in leech development.

D A Weisblat1, D J Price, C J Wedeen

  • 1Department of Zoology, University of California, Berkeley 94720.

Development (Cambridge, England)
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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Leech development involves stereotyped cell lineages from embryonic stem cells called teloblasts. Segmental tissues arise from specific cell lines, but their clones interdigitate, showing no simple clonal basis for segments.

Area of Science:

  • Developmental biology
  • Cell lineage tracing
  • Annelid embryogenesis

Background:

  • Glossiphoniid leeches exhibit highly stereotyped cell lineages from the first cleavage.
  • Segmental tissues are derived from specific embryonic stem cells known as teloblasts.
  • Cell lines for prostomial and segmental tissues separate early in development.

Purpose of the Study:

  • To investigate the relationship between cell lineages and segment formation in Helobdella triserialis.
  • To determine if identifiable cell clones form the basis of defined leech segments.
  • To analyze the contribution of different cell lines (M, N, O, P, Q) to segmental development.

Main Methods:

  • Analysis of cell lineages using identified cells from first cleavage.

Related Experiment Videos

  • Tracking of blast cell clones derived from teloblasts.
  • Comparison of clonal distribution with segment morphology.

    • Main Results:

    • Five bilateral pairs of teloblasts generate longitudinal cell columns (bandlets) for segmental tissues.
    • Ectodermal cell lines (N, O, P, Q) and one mesodermal line (M) exist on each side.
    • While M, O, and P lines produce a segmental complement per blast cell, their clones interdigitate across segments.
    • N and Q lines require two alternating blast cells for a segmental complement, with shorter clonal extent.

    Conclusions:

    • There is no simple clonal basis for morphologically defined segments in Helobdella triserialis.
    • The interdigitation of clones across segments indicates a complex developmental process.
    • Understanding these cell lineages is crucial for deciphering annelid segment formation.