Occlusion body evolution

We suspect that the manipulation with Baculo- and Entomopoxviruses within insects used as a bio-insecticide and it’s  over-use in the environment are the main causative agent of Morgellons Disease.

Global Warming, environmental contaminates, over-use of antibiotics, disinfectant solutions etc. in our modern world, air-pollution and the pollution of water and soil are additional components which should also be considered.

Surely, the reduction of natural enemies such as bats and/or frogs lead to an ‘explosion’, to an over population of insects.

Here are excerpts of an article:

In temperate climates and in many tropical areas where there are wet and dry seasons, insect populations are transitory and expand dramatically during warm, moist periods, and then collapse with the onset of colder temperatures or drought when food sources are reduced or eliminated.

In addition, even during seasons optimal for insect growth and reproduction, their populations are normally limited by predators, pathogens, normal temperature cycles, and food sources.

However, under certain circumstances, insect populations can expand dramatically when a combination of conditions greatly increases their food supply, facilitates high levels of reproduction, or eliminates predators and pathogens.

These cycles of population expansion are well documented for forest insects and may be separated by long periods of time.

For example, the Douglas fir tussock moth, a pest of forests in Western North America has cycles of 7 to 10 years, and other insect epizootics are separated by 5 to 40 years (reviewed in Ref (1).

Viruses often play a major role in causing the collapse of these large insect populations.

A major consequence of the cyclic nature of insect populations is that their pathogens are left without hosts either seasonally, or for much longer periods of time.

Viruses, in general, have developed several methods to insure their survival until their hosts reappear.

If their hosts are seasonal, such as those of insect pathogens, viruses could be present in the eggs or pupae of over wintering insects, or they might persist in alternate hosts, or some might remain stable outside their host.

Although there is some evidence for baculoviral persistence within host insects (see Chapter 3), stability outside their host mediated by their presence within occlusion bodies appears to be a common feature of all baculoviruses.

By immobilizing the virus within the crystalline protein lattice of the occlusion body, an environment is provided that allows virions to remain viable indefinitely as long as they are protected from extremes of heat and from uv light.

In addition, the stability provided by occlusion may be of such a selective advantage for insect viruses that it has apparently been incorporated into the life cycle of three different types of insect viruses; in Reoviridae (cypoviruses, double-stranded RNA viruses with segmented genomes), the Poxviridae (entomopox viruses-dsDNA viruses with cytoplasmic replication), and in the Baculoviridae.

source:

http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=bacvir&part=ch02

~ by k&k on September 7, 2009.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

 
%d bloggers like this: