Profiles of low complexity regions in Apicomplexa Genome evolution and evolutionary systems biology

Fabia U. Battistuzzi, Kristan A. Schneider, Matthew K. Spencer, David Fisher, Sophia Chaudhry, Ananias A. Escalante

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Background: Low complexity regions (LCRs) are a ubiquitous feature in genomes and yet their evolutionary history and functional roles are unclear. Previous studies have shown contrasting evidence in favor of both neutral and selective mechanisms of evolution for different sets of LCRs suggesting that modes of identification of these regions may play a role in our ability to discern their evolutionary history. To further investigate this issue, we used a multiple threshold approach to identify species-specific profiles of proteome complexity and, by comparing properties of these sets, determine the influence that starting parameters have on evolutionary inferences. Results: We find that, although qualitatively similar, quantitatively each species has a unique LCR profile which represents the frequency of these regions within each genome. Inferences based on these profiles are more accurate in comparative analyses of genome complexity as they allow to determine the relative complexity of multiple genomes as well as the type of repetitiveness that is most common in each. Based on the multiple threshold LCR sets obtained, we identified predominant evolutionary mechanisms at different complexity levels, which show neutral mechanisms acting on highly repetitive LCRs (e.g., homopolymers) and selective forces becoming more important as heterogeneity of the LCRs increases. Conclusions: Our results show how inferences based on LCRs are influenced by the parameters used to identify these regions. Sets of LCRs are heterogeneous aggregates of regions that include homo-and heteropolymers and, as such, evolve according to different mechanisms. LCR profiles provide a new way to investigate genome complexity across species and to determine the driving mechanism of their evolution.

Original languageEnglish (US)
Article number47
JournalBMC Evolutionary Biology
Issue number1
StatePublished - Feb 29 2016
Externally publishedYes


  • Apicomplexa
  • Complexity threshold
  • Composition bias
  • Homopolymers
  • Low complexity regions
  • Plasmodium falciparum
  • Repetitive regions

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics


Dive into the research topics of 'Profiles of low complexity regions in Apicomplexa Genome evolution and evolutionary systems biology'. Together they form a unique fingerprint.

Cite this