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Molecular Biology Reports

, Volume 41, Issue 6, pp 3859–3866 | Cite as

Evolution of primate α and θ defensins revealed by analysis of genomes

  • Diyan Li
  • Long Zhang
  • Huadong Yin
  • Huailiang Xu
  • Jessica Satkoski Trask
  • David Glenn Smith
  • Ying Li
  • Mingyao YangEmail author
  • Qing ZhuEmail author
Article

Abstract

Defensins are endogenous peptides with cysteine-rich antimicrobial ability that contribute to host defence against bacterial, fungal and viral infections. There are three subfamilies of defensins in primates: α, β and θ-defensins. α-defensins are most present in neutrophils and Paneth cells; β-defensins are involved in protecting the skin and the mucous membranes of the respiratory, genitourinary and gastrointestinal tracts; and θ-defensins are physically distinguished as the only known fully-cyclic peptides of animal origin, which are first isolated from rhesus macaques. All three kinds of defensins have six conserved cysteines, three intramolecular disulfide bonds, a net positive charge, and β-sheet regions. α and θ-defensins are closely related, comparative amino acid sequences showed that the difference between them is that θ-defensins have an additional stop codon limits the initial defensin domain peptides to 12 residues. Humans, chimpanzees and gorillas do not produce θ-defensin peptides due to a premature stop codon present in the signal sequence of all θ-defensin pseudogenes. By using comprehensive computational searches, here we report the discovery of complete repertoires of the α and θ-defensin gene family in ten primate species. Consistent with previous studies, our phylogenetic analyses showed all primate θ-defensins evident formed one distinct clusters evolved from α-defensins. β-defensins are ancestors of both α and θ-defensins. Human has two copies of DEFA1 and DEFT1P, and two extra DEFA3 and DEFA10P genes compared with gorilla. As different primates inhabit in quite different ecological niches, the production of species-specific α and θ-defensins and these highly evolved θ-defensins in old world monkeys would presumably allow them to better respond to the specific microbial challenges that they face.

Keywords

α Defensin θ Defensin Primates Genome evolution 

Notes

Acknowledgments

This work was supported by China Agriculture Research System (CARS-41), and the Program from Sichuan Province (2011NZ0099-7 and 2011NZ0073).

Supplementary material

11033_2014_3253_MOESM1_ESM.file (35 kb)
Supplementary material 1 (FILE 34 kb)
11033_2014_3253_MOESM2_ESM.file (13 kb)
Supplementary material 2 (FILE 12 kb)
11033_2014_3253_MOESM3_ESM.xls (28 kb)
Supplementary material 3 (XLS 27 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Diyan Li
    • 1
  • Long Zhang
    • 1
  • Huadong Yin
    • 1
  • Huailiang Xu
    • 2
  • Jessica Satkoski Trask
    • 3
  • David Glenn Smith
    • 3
  • Ying Li
    • 1
  • Mingyao Yang
    • 1
    Email author
  • Qing Zhu
    • 1
    Email author
  1. 1.Institute of Animal Genetics and BreedingSichuan Agricultural UniversityYa’anPeople’s Republic of China
  2. 2.College of Animal Science and TechnologySichuan Agricultural UniversityYa’anPeople’s Republic of China
  3. 3.Department of Anthropology and California National Primate Research CenterUniversity of California, DavisDavisUSA

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