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Related Experiment Videos

Discontinuities and overlaps in patterning within single cells.

J Frankel, E M Nelsen

    Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
    |October 7, 1981
    PubMed
    Summary
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    Tetrahymena cell division involves longitudinal and equatorial growth. A study reveals two reference borders controlling cell positioning, potentially explaining pattern generation in both wild-type and mutant cells.

    Area of Science:

    • Cell Biology
    • Developmental Biology
    • Protozoology

    Background:

    • Ciliates like Tetrahymena exhibit complex cell division patterns.
    • Understanding cellular positioning is crucial for comprehending organismal development.
    • Existing models do not fully explain the longitudinal organization in Tetrahymena.

    Purpose of the Study:

    • To investigate the positional systems governing cell division in Tetrahymena.
    • To identify and characterize reference borders involved in cellular organization.
    • To explore the genetic basis of altered cell positioning in mutants.

    Main Methods:

    • Observation of wild-type and mutant (janus) Tetrahymena.
    • Analysis of contractile vacuole pore (c.v.p.) positioning.

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  • Comparative study of cell division and oral structure development.

    • Main Results:

    • Tetrahymena possesses a primary reference border associated with oral development.
    • A recessive mutant (janus) reveals a second, oppositely oriented reference border.
    • Changes in c.v.p. patterns precede morphological abnormalities in mutants.

    Conclusions:

    • Two overlapping, oppositely directed positional systems likely exist in Tetrahymena.
    • These systems may be present in both wild-type and mutant cells.
    • A model is proposed for how these systems generate cellular patterns.