Bizarre Sea Slug - Interesting

Discussion in 'Other Livestock' started by Albert Terego, 10 Jun 2013.

  1. Albert Terego

    Albert Terego

    Posts: 599
    19 May 2008
    Likes Received:
    Randburg, Johannesburg

    SEATTLE — It’s easy being green for a sea slug that has stolen enough genes to become the first animal shown to make chlorophyll like a plant.
    [​IMG]Shaped like a leaf itself, the slug Elysia chlorotica already has a reputation for kidnapping the photosynthesizing organelles and some genes from algae. Now it turns out that the slug has acquired enough stolen goods to make an entire plant chemical-making pathway work inside an animal body, says Sidney K. Pierce of the University of South Florida in Tampa.
    The slugs can manufacture the most common form of chlorophyll, the green pigment in plants that captures energy from sunlight, Pierce reported January 7 at the annual meeting of the Society for Integrative and Comparative Biology. Pierce used a radioactive tracer to show that the slugs were making the pigment, called chlorophyll a, themselves and not simply relying on chlorophyll reserves stolen from the algae the slugs dine on.
    “This could be a fusion of a plant and an animal — that’s just cool,” said invertebrate zoologist John Zardus of The Citadel in Charleston, S.C.

    Microbes swap genes readily, but Zardus said he couldn’t think of another natural example of genes flowing between multicellular kingdoms.
    Pierce emphasized that this green slug goes far beyond animals such as corals that host live-in microbes that share the bounties of their photosynthesis. Most of those hosts tuck in the partner cells whole in crevices or pockets among host cells. Pierce’s slug, however, takes just parts of cells, the little green photosynthetic organelles called chloroplasts, from the algae it eats. The slug’s highly branched gut network engulfs these stolen bits and holds them inside slug cells.
    Some related slugs also engulf chloroplasts but E. chlorotica alone preserves the organelles in working order for a whole slug lifetime of nearly a year. The slug readily sucks the innards out of algal filaments whenever they’re available, but in good light, multiple meals aren’t essential. Scientists have shown that once a young slug has slurped its first chloroplast meal from one of its few favored species of Vaucheria algae, the slug does not have to eat again for the rest of its life. All it has to do is sunbathe.
    But the chloroplasts need a continuous supply of chlorophyll and other compounds that get used up during photosynthesis. Back in their native algal cells, chloroplasts depended on algal cell nuclei for the fresh supplies. To function so long in exile, “chloroplasts might have taken a go-cup with them when they left the algae,” Pierce said.
    There have been previous hints, however, that the chloroplasts in the slug don’t run on stored-up supplies alone. Starting in 2007, Pierce and his colleagues, as well as another team, found several photosynthesis-related genes in the slugs apparently lifted directly from the algae. Even unhatched sea slugs, which have never encountered algae, carry “algal” photosynthetic genes.
    At the meeting, Pierce described finding more borrowed algal genes in the slug genome for enzymes in a chlorophyll-synthesizing pathway. Assembling the whole compound requires some 16 enzymes and the cooperation of multiple cell components. To see whether the slug could actually make new chlorophyll a to resupply the chloroplasts, Pierce and his colleagues turned to slugs that hadn’t fed for at least five months and had stopped releasing any digestive waste. The slugs still contained chloroplasts stripped from the algae, but any other part of the hairy algal mats should have been long digested, he said.
    After giving the slugs an amino acid labeled with radioactive carbon, Pierce and his colleagues identified a radioactive product as chlorophyll a. The radioactively tagged compound appeared after a session of slug sunbathing but not after letting slugs sit in the dark. A paper with details of the work is scheduled to appear in the journal Symbiosis.
    Zardus, who says that he tries to maintain healthy skepticism as a matter of principle, would like to hear more about how the team controlled for algal contamination. The possibilities for the borrowed photosynthesis are intriguing though, he says. Mixing the genomes of algae and animals could certainly complicate tracing out evolutionary history. In the tree of life, he said, the green sea slug “raises the possibility of branch tips touching.”
    “Bizarre,” said Gary Martin, a crustacean biologist at Occidental College in Los Angeles. “Steps in evolution can be more creative than I ever imagined.”
    tekkengal likes this.
  2. AdS Guest

    to hide all adverts.
  3. the fish

    the fish

    Posts: 2,074
    23 May 2012
    Likes Received:
    Florida Hills Jhb

  4. tekkengal

    tekkengal Moderator

    Posts: 2,306
    30 Mar 2010
    Likes Received:

    This is so cool!
    Thanks for posting!
  5. dallasg

    dallasg Moderator MASA Contributor

    Posts: 16,761
    14 Dec 2008
    Likes Received:

    i love nature, its a pity we has humans think this planet is only for us
  6. RiaanP

    RiaanP Moderator

    Posts: 22,976
    11 Aug 2008
    Likes Received:

    a girl I know done her second year varsity paper on these slugs a couple of weeks ago. Although it sounds the same as corals that have beneficial algae cells them. It is not the same. The algae in the corals are still an organism on its own and can be expelled under stress.
  7. JamesHunter


    Posts: 387
    31 Jan 2013
    Likes Received:

  8. LCornelius

    LCornelius Moderator

    Posts: 5,447
    5 Mar 2009
    Likes Received:
    Durbanville (CPT)

    Very interesting!
    Last edited: 10 Jun 2013
  9. Dorry

    Dorry dorry

    Posts: 1,699
    18 Jul 2012
    Likes Received:
    Mntunzini Kwazulu Natal

Recent Posts
Similar Threads - Bizarre Slug Interesting Forum Date
Barrelfish BIZARRE Marine Fish Discussions 6 Feb 2013
Odd slug ID Needed 30 Jun 2016
Slug ID Needed 9 Jul 2015
Sluggish fright. ID Needed 14 Jun 2015
ID slug/snail ID Needed 23 Mar 2015
Slug ID ID Needed 20 Mar 2015
Local Nudibranch / Sea Slug ID - Friend or Foe? ID Needed 14 Mar 2015