Type

Journal Article

Authors

Daniel G Bradley
David J Lynn

Subjects

Microbiology

Topics
alpha defensins evolution molecular chemistry amino acid sequence animals metabolism molecular sequence data mammals

Discovery of alpha-defensins in basal mammals. (2006)

Abstract Alpha-defensins are essential molecules of the innate immune system that have broad spectrum antimicrobial activity against a range of bacteria and viruses. To date, alpha-defensins have only been identified in the Euarchontoglires branch of the mammals. This has led to speculation that alpha-defensins may be specific to this group, a somewhat surprising finding, given their importance in the immune system. The mammalian genome project provided us with the opportunity to search for alpha-defensins in previously unexamined mammalian superorders. Using hidden Markov model (HMM) profile searching, we report the discovery of alpha-defensins in the African savanna elephant, the lesser hedgehog tenrec, and the nine-banded armadillo genomes representing two of the most basal mammalian superorders, Afrotheria and Xenarthra. Furthermore, we identify an alpha-defensin-like gene in the gray short-tailed opossum, suggesting that alpha-defensins may have evolved much earlier than previously thought, before the divergence of placental mammals and marsupials approximately 130 mya.
Collections Ireland -> Trinity College Dublin -> PubMed

Full list of authors on original publication

Daniel G Bradley, David J Lynn

Experts in our system

1
Daniel Bradley
Trinity College Dublin
Total Publications: 84
 
2
David J Lynn
Teagasc
Total Publications: 37