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PhilKravitz
How much of "junk dna" is actually on/off switches for gene regulation?
PhilKravitz said:How much of "junk dna" is actually on/off switches for gene regulation?
Pythagorean said:[tex] \frac{d[tf-a mRNA]}{dt} = \frac{k_max [TF-A]^2}{[TF-A]^2 +K_d} - k_degR [tf-a mRNA] + R_bas [/tex]
is more interesting than on/off
mtc1973 said:Let me precede this by saying - i am no geneticist! but I always thought that there may be an evolutionary benefit from junk dna. Think about a lizards tail! Now think about the rate of mutation -if mutation is random - there is more likelyhood it occurs in a non essential area if we have junk dna. if every bit of dna were vital - then we would breakdown function quickly - so i always like to think of it as equivalent to the lizards tail - dna we can afford to loose/mutate - the stuff we can afford to mess with without having detrimental effect on our essential function. And with epigenetic phenomenon - who knows what 'junk' really means?
nobahar said:I think you're marvelous, but I have to give you points for esotericism.
I'm probably wrong but I do not understand this explanation. Each base has a certain probability of mutating. Having lots more bases does not alter the individual probability of any single base mutating, it just means there will be a greater number of absolute mutations in the genome. It will not decrease the chances of any particular base from mutating, or act as a 'buffer'. Apologies if I am wrong.
Junk DNA, also known as non-coding DNA, refers to segments of DNA that do not code for proteins and were once thought to have no function.
Scientists estimate that about 98% of our DNA is considered "junk DNA."
Recent research has shown that some portions of "junk DNA" do have functions, such as regulating gene expression and maintaining the stability of chromosomes.
"On/off switches" for gene regulation refer to specific segments of DNA that control the expression of genes. These switches can turn genes on or off by binding to certain proteins and activating or repressing their expression.
Scientists are currently working on various techniques to identify and study the functions of different segments of "junk DNA." These include epigenetic studies, which look at modifications to DNA and associated proteins, and CRISPR-Cas9 technology, which can target and manipulate specific segments of DNA.