/ Nature & Wildlife

Are Human-Animal Hybrids Coming?

Published August 2, 2011 in Love For Earthlings |
Tags: , , , , ,

The Academy of Medical Sciences in Britain has released a report exploring the possibility of mixing human cells of genes into animals for research purposes. They say the value to research into human disease warrants discussion and further scrutiny.

In the report they say, “This report considers research that involves the introduction of human DNA sequence into animals, or the mixing of human and animal cells or tissues, to create entities we refer to as animals containing human material (ACHM).”

Specific examples they give are dramatic changes to an animal brain using human cells to evaluate what consciousness or sentience is, cross-fertilization between human and animal reproductive material such as sperm and eggs to see what develops, genetic modifications to animals to make them resemble humans more or increase their capacity for speech.

In their own words, “Breeding of animals that have, or may develop, human derived germ cells in their gonads, where this could lead to the production of human embryos or true hybrid embryos within an animal.” (Source: Academy of Medical Societies)

Splicing human genes into rats for research purposes has been done for some years. Still, some of the scenarios described above seem like science-fiction novels or movies. The film Blade Runner foresaw a future filled with biologically designed organisms, both animal and human. Maybe it is not that far away.

As one commenter put it, “Give it a decade or two, and humanity is going to genetically engineer some very human-like animals.” (Source: Singularityhub.com)

Note: the pigs pictured above contain no human genes, but were genetically modified to produce less environmentally-damaging waste. Image Credit: Cecil W. Forsberg

Adapted from an article by Jake R.


Modern Polar Bears Orginated in Ireland

Published July 25, 2011 in Love For Earthlings |
Tags: , , , , , , , , , , , ,

Brown Bears and Polar Bears Met Often during Last 100,000 Years
A team of scientists discovered that the female ancestor to all modern polar bears was actually a species of brown bear living in Britain and Ireland just before the last ice age. The hybridization occurred between 20,000 and 50,000 years ago, and the species of brown bear has been extinct for the last 9,000 years.

According to the press release, “Beth Shapiro, the Shaffer Associate Professor of Biology at Penn State University and one of the team’s leaders, explained that climate changes affecting the North Atlantic ice sheet probably gave rise to periodic overlaps in bear habitats. These overlaps then led to hybridization, or interbreeding — an event that caused maternal DNA from brown bears to be introduced into polar bears.”

Researchers once thought that the female ancestor of polar bears lived about 14,000 years ago on the Alaskan islands of Admiralty, Baranof, and Chichagof. However, the new evidence collected from studying 242 brown bear and polar bear mitochondrial lineages (tracing genetic history from the mother’s side) from the last 120,000 years shows it happened tens of thousands of years earlier, and on a different part of the planet.

Hybridization Could Help Polar Bears Survive Environmental Changes
While polar bears and brown bears are strikingly different in their physical appearance, their ancestry seems to be intricately linked — and could be intermingled again as melting ice brings brown bears and polar bears back into contact with one another, creating hybrids of grizzlies and polar bears called “growler bears” or “pizzly bears.”

Apparently the hybridization we’ve witnessed recently due to global climate change and a reduction of sea ice has happened often over the last 100,000 years as warming and cooling cycles brought the bears in and out of contact with one another.

Shapiro states that a thorough understanding of the genetic history of polar bears as well as previous responses to environmental changes could conservationists form strategies for keeping polar bears from disappearing altogether.