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Stretch coding and block coding: two new strategies to represent questionably aligned DNA sequences.

Daniel L Geiger1

  • 1Santa Barbara Museum of Natural History, Santa Barbara, CA 93105, USA. dgeiger@usc.edu

Journal of Molecular Evolution
|February 1, 2002
PubMed
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Phylogenetic coding strategies often conflict with homology principles. New methods, block and stretch coding, avoid these issues and preserve phylogenetic information, aligning with morphological data practices.

Area of Science:

  • Bioinformatics
  • Computational Biology
  • Evolutionary Biology

Background:

  • Traditional coding strategies for sequence alignment issues like gaps and missing data often violate phylogenetic principles.
  • These conflicts can arise from failing the test of conjunction or leading to contradictory character-state optimizations.

Purpose of the Study:

  • To introduce novel coding strategies that resolve conflicts between sequence alignment and phylogenetic principles.
  • To present methods that maintain the integrity of homology and character observations.

Main Methods:

  • Introduced two new coding strategies: block coding and stretch coding.
  • Evaluated these methods against existing strategies like data exclusion and contraction.
  • Compared the new methods to morphological data coding practices, accounting for character and topographical identity.

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Main Results:

  • Block and stretch coding do not conflict with the test of conjunction or contradict original observations.
  • These methods are comparable to morphological data coding when intrinsic differences are considered.
  • They allow additional character states to represent information in highly dissimilar sequences.

Conclusions:

  • Block and stretch coding offer viable alternatives for handling problematic sequence alignments in phylogenetic analyses.
  • The selection of a recoding method should prioritize the preservation of maximum phylogenetic information, measured by the minimum steps required.