Study: Single Gene, Plus Some "Junk" DNA Turned Ape Ancestors Into Modern Man
November 23, 2012 11:03 AM
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(Source: Matt Groening/Fox)
Crucial gene controls higher brain growth
To the uninformed observer it may seem baffling how geneticists, biochemists, paleontologists, and other researchers can claim that two creatures that look as different as a man and a monkey could not only be "related" but have been
produced by evolution
the last couple million years
I. It's All in the Genes
But the key to understanding evolution is to understand genetics: our body is driven by protein enzymes, which catalyze critical processes inside the body. Many proteins share common domains. And the blueprints to all the proteins a creature makes are stored in a special highly-ordered storage construct called DNA.
While living organisms go to great lengths to preserve their genetic code without errors like swapped sections or deletions, occassionally during the process of making sperm and eggs such an error is made. Most errors result in infertility or death of the offspring. But occasionally just the right combination of protein domains has accidentally been clumped together, producing something that fundamentally transforms the organism.
Researchers have finally found a gene -- perhaps
gene -- which separates humans from the ancestors they share with apes.
Humans and apes, both members of the order Primates, share
96 percent of their genetic code
. Most of the remaining 4 percent is so-called "junk" DNA; stretches of mostly inactive code.
Humans share 96 percent of their genetic code with primates, like this
[Image Source: Mark Snelson]
Of course, junk DNA is not useless geneticists and biochemists have recently discovered. It has been shown to in many cases play a key role in regulation of other genes' expression and other "epigenetic" effects.
But researchers had yet to discover a truly active gene that humans have that apes lack -- until now.
II. miR-941 May Hold the Key to How Mankind is so Crafty
Researchers at the University of Edinburgh in Scotland have discovered a gene called miR-941, which is only found in humans and is absent in their primate relatives.
The gene was absent not only in the gorilla and
, but also in the genomes of other non-primates, such as mice and rats. The gene, absent in all the other critters except for man, is mainly active in the brain; particularly in areas of the brain
associated with so-called "higher brain" functions
The gene was actively being transcribed in the regions of the brain responsiible for language learning and decision making. Researchers hypothesize that it may play a key role in abilities that are largely unique to humans, such as formulating, understanding, and preserving multiple complex communications codes (languages) and developing advanced tools (weapons, machinery).
The newly discovered human-unique gene is active in areas of the brain associated with higher thinking processes. [Image Source: Neuroimages Tumblr]
Some other creatures -- gorillas, parrots, dolphins, and whales -- show different levels of sign language or spoken/sung language skills. And chimpanzees, octupi, and other creatures have been shown to use basic implements, like sticks, as tools. However, only humans are known to manifest these helpful survival skills in more complex manners.
Now, modern genetics may have cracked a key mystery of human evolution and explained why.
The research was
in the prestigious peer-review journal
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RE: Religion and science.
11/27/2012 8:48:35 AM
I personally believe in a creator, and I believe that evolution and natural selection are simply the tools used to create life. The understanding of a divine act does not diminish its divinity.
The argument you are using is called “Irreducible Complexity” which basically states that even the sub-components of simple cells are too complex to have given evolutionary advantages. Everything that you mention as being too complex to have evolved has been researched and there are very good answers for all of them (many produced by chemists).
You seem to think that in order for evolution to be valid it must start with an entire modern, eukaryotic (meaning it has an enclosed nucleus) cell. This is simply not true. Most cells on this plant are prokaryotic (no enclosed nucleus) which are significantly simpler. Spontaneous formation of phospholipids has been shown in vitro and self-replicating RNA molecules and proteins have been created. All it takes if for one self-replicating molecule to find its way into a phospholipid bubble and you have a primitive cell. Very simple cells have been created in labs which are capable of performing one or two metabolic reactions.
The problem most people have is the inability to understand the magnitude and power of time. I completely agree that the odds of chemicals spontaneously forming self-replicating molecules is astronomical, but what you don’t understand is that the timeframes evolution deals with are astronomical. Our perspective is so limited that it is difficult to comprehend hundreds of years, but evolution works with millions and billions of years.
I could refute every one of your points, but so could any 101 biology text book. I suggest that you research what you are talking about a little more before you make assertions as to what is or isn’t impossible.
"A politician stumbles over himself... Then they pick it out. They edit it. He runs the clip, and then he makes a funny face, and the whole audience has a Pavlovian response." -- Joe Scarborough on John Stewart over Jim Cramer
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