retrovirus

Retrovirus

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) The Primate Research Institute of Kyoto University reported on its website on 11 november that the culprit was simian retrovirus-4 (SRV-4). The problem emerged

XMRV ruled out The retrovirus XMRV is linked not to chronic fatigue syndrome (CFS a definitive study that cost US$2. 3 Â million concluded on 18 Â September.

marking 30 Â years since the first reports of a retrovirus associated with AIDS. www. 30yearshiv. org

Turns out that these chickens have a high incidence of a particular retrovirus called EAV-HP. Retroviruses are a type of virus that integrates its own genetic data into the host in an unusual order.

and then into protein retroviruses operate backwards retroviruses have RNA which they use to make DNA

HIV is probably the best-known retrovirus. This EAV-HP retrovirus is responsible for inserting that weird gene the one that turns the chicken eggs blue.

Specifically it changes the chemistry of the eggshell so that it can take in biliverdin a bile pigment from the chicken's uterus.

which revealed the genetic cause of the blue coloured egg shell--surprisingly--an ancient harmless retrovirus in the domestic chicken.

A retrovirus is a virus that unlike most cellular organisms carries its genetic blueprint in the form of ribonucleic acid (RNA.

This makes it possible for genetic material from a retrovirus to become permanently incorporated into the DNA of an infected cell.

In this case the retrovirus'effect was to trigger an accumulation of a green-blue bile pigment called biliverdin in the eggshell as the egg develops in the hen.

An unexpected find was the unique integration sites for the retrovirus in South american/European and Asian chickens.

and diversity of species. It's quite remarkable--retroviruses are considered generally to integrate at random locations in the genome

and so the chance of a retrovirus integrating at more or less the same location in two chicken populations is extremely low.

It's therefore entirely possible that retroviruses could be playing a part in the diversity of egg colour