Population Genetics of Nosema apis and Nosema ceranae: One Host (Apis mellifera) and
Results 1 to 3 of 3
  1. #1
    Join Date
    Jan 2010
    Location
    Alachua County, FL, USA
    Posts
    10,025

    Default Population Genetics of Nosema apis and Nosema ceranae: One Host (Apis mellifera) and

    Population Genetics of Nosema apis and Nosema ceranae: One Host (Apis mellifera) and Two Different Histories
    Two microsporidians are known to infect honey bees: Nosema apis and Nosema ceranae. Whereas population genetics data for the latter have been released in the last few years, such information is still missing for N. apis. Here we analyze the patterns of nucleotide polymorphism at three single-copy loci (PTP2, PTP3 and RPB1) in a collection of Apis mellifera isolates from all over the world, naturally infected either with N. apis (N = 22) or N. ceranae (N = 23), to provide new insights into the genetic diversity, demography and evolution of N. apis, as well as to compare them with evidence from N. ceranae. Neutral variation in N. apis and N. ceranae is of the order of 1%. This amount of diversity suggests that there is no substantial differentiation between the genetic content of the two nuclei present in these parasites, and evidence for genetic recombination provides a putative mechanism for the flow of genetic information between chromosomes. The analysis of the frequency spectrum of neutral variants reveals a significant surplus of low frequency variants, particularly in N. ceranae, and suggests that the populations of the two pathogens are not in mutation-drift equilibrium and that they have experienced a population expansion. Most of the variation in both species occurs within honey bee colonies (between 62%-90% of the total genetic variance), although in N. apis there is evidence for differentiation between parasites isolated from distinct A. mellifera lineages (20%-34% of the total variance), specifically between those collected from lineages A and C (or M). This scenario is consistent with a long-term host-parasite relationship and contrasts with the lack of differentiation observed among host-lineages in N. ceranae (< 4% of the variance), which suggests that the spread of this emergent pathogen throughout the A. mellifera worldwide population is a recent event.
    http://journals.plos.org/plosone/art...l.pone.0145609
    americasbeekeeper.com
    [email protected]

  2. Remove Advertisements
    BeeSource.com
    Advertisements
     

  3. #2
    Join Date
    Feb 2007
    Location
    Lincolnton, NC
    Posts
    1,467

    Default Re: Population Genetics of Nosema apis and Nosema ceranae: One Host (Apis mellifera)

    Thanks for posting this. I wish someone with a geneticist background will explain it to be sure I really understand it.
    Lawrence Heafner
    15 hives; 17 years; TF for 12; Zone 7B

  4. #3
    Join Date
    Dec 2008
    Location
    syracuse n.y.
    Posts
    5,402

    Default Re: Population Genetics of Nosema apis and Nosema ceranae: One Host (Apis mellifera)

    reveals a significant surplus of low frequency variants
    Ya really have to watch those low frequency variants, I've seen them sneaking around my apiaries, and I don't have a good feeling about them.
    mike syracuse ny
    Whatever you subsidize you get more of. Ronald Reagan

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •