[ "Junk DNA"]

[ "Junk DNA"]

Yeast and worms like how simple biological evolution for birds and mammals such complex biological? A view of the extensive genome comparative study shows that the answer may be hidden in the garbage of deoxyribonucleic acid (DNA). American scientists found that the more complex biological, carrying the more junk DNA, and it is not coding these "useless" DNA help higher organisms evolved a complex organism.

Since the first eukaryotes - ranging from yeast to humans by the biological cell - the genome has been deciphered, scientists have wanted to know why the majority of DNA and has not formed a useful genes. From the chromosome mutation protection to the structure of support for this so-called junk DNA may explain many of the species. But last year from the human, mouse and rat are on the complete consensus on the junk DNA research, it showed that in this region may contain an important adjustment mechanism, which can control the basis of biochemical reactions and development process This will help the biological evolution of a more complex organism. And simple eukaryotes compared to more complex biological mutations in the gene will not doubt the fact that this has greatly strengthened found.

To this deeper understanding of the problem, by the United States at the University of California, Santa Cruz (UCSC) biologist David Haussler of the leadership of a research group, the five kinds of vertebrate animals - people, mice, rats , chicken and blowfish - junk DNA sequence and four kinds of insects, worms, and two of the seven kinds of junk DNA sequence of yeast were compared. Comparative results from the study received a shocking pattern: The more complex biological, junk DNA seems to be more important.

Among these is the possibility of implicit, if different types of biological have the same DNA, then the DNA must be used to solve some key problems. Yeast and vertebrates share a certain amount of DNA, after all, they all need to make proteins, but only 15% of the total DNA and gene irrelevant. Research Group in the July 14 "Genome Research" magazine online report that they will be more complex yeast and worms were compared, the latter is a multi-cell biology, found that 40% of the total DNA was not coding . Subsequently, the researchers will invertebrates and insects were compared, these organisms more complex than worms, the results showed that more than 66% of the total DNA contains no coding DNA.

Participate in the study of the work of the UCSC biologist Adam Siepel pointed out that the worm's findings needs to be cautiously treated, it is only because of these scientists of the two genomes were analyzed. Nevertheless, Siepel believes that the findings strongly support such a theory, that is, invertebrates and insects in the biological complexity of the increase is mainly due to the precise gene regulation patterns.