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Related Experiment Videos

A double segment periodicity underlies segment generation in centipede development.

Ariel D Chipman1, Wallace Arthur, Michael Akam

  • 1University Museum of Zoology, Downing Street, Cambridge CB2 3EJ, United Kingdom. adc36@cam.ac.uk

Current Biology : CB
|July 23, 2004
PubMed
Summary
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Centipede segment number, always odd, arises from double segment periodicity. Gene expression reveals early double-segment patterns that resolve into single segments, explaining the "all-odd" phenomenon.

Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Genetics

Background:

  • Centipede leg-bearing segment numbers range from 15 to 191 but are always odd.
  • This
  • all-odd
  • pattern suggests a double segment periodicity during development, though evidence was lacking.

Purpose of the Study:

  • To investigate the genetic basis of centipede segmentation.
  • To identify early molecular markers for segment formation in geophilomorph centipedes.

Main Methods:

  • Studied gene expression patterns of an odd-skipped related gene (odr1) and a caudal homolog in Strigamia maritima.
  • Analyzed dynamic gene expression around the proctodaeum during embryonic development.

Related Experiment Videos

Main Results:

  • Observed dynamic odr1 expression forming concentric rings, indicating double segment periodicity in unsegmented tissue.
  • Caudal homolog expression initially mirrored double segment periodicity.
  • Intercalation of additional stripes before engrailed expression led to single segment periodicity.

Conclusions:

  • Provided the first molecular evidence for the causality of the
  • all-odd
  • segment number pattern in centipedes.
  • Findings offer insights into the evolution of arthropod segmentation mechanisms.