Does DNA provide the evidence of an intelligent design by GOD or an occurrence of nature and evolution? According to Theodosius Grygorovych Dobzhansky “Nothing in biology makes sense except in the light of evolution.”
Role of Introns
Role of introns: Left over’s of evolution or evidence of intelligent design
Often genes are composed of coding regions called exons and internal non-coding regions called introns. The genes in higher eukaryotes interrupted by intragenic non-coding sequences called introns are loosely called “nonsense genes”. The role of introns is a topic of great interest in gene research and evolutionary circles. There are several theories and suggestion of the role of introns or “junk” DNA as to why they use a vast amount of cell resources and almost all cases not transcribed into protein and if it does; show non-protein functions or has no functions.
Evolutional theory suggests that there existed DNA with no coding regions that later evolved to some coding regions to produce cell structures and protein and hence the earliest form of single cell organisms. Evolutionists argue that the large sections of DNA that have no purpose are “junk” DNA and uses large amount of energy and resources by the cell and carries no function; cannot be a design of an intelligent designer. Hence the genome shows proof of evolution and subsequently no sign of design.
It is thought that introns were introduced during evolution by viruses into the human genome or by faulty DNA replication. To encourage genomic diversity, genes that undergo alternative splicing produce multiple copies of the same gene. It is also hypothesised that several genes were non functional but evolution and selection pressure allowed conversion into functional genes such as genes coding proteins to allow cell survival.
Another theory suggests that proteins from these introns where once harmful and hence made redundant to prevent harm to the cells and the organism. Alternatively, it is also possible that the whole human genome including introns were once functional and served a purpose for survival and now not required. The DNA also might have rearranged and reordered to create new sequences that code for novel proteins required for new functions.
Although the roles of all introns are not fully known, some preliminary research shows that not all introns are junk DNA and might have profound roles not yet known. For example, it might have been associated with creation of new genes during evolution (exon theory of genes), it may be important for the expression of some genes on which the intron exists and required for alternative splicing to create variations of mRNA of a gene.
