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"...Applying a molecular clock to extrapolate times of origin of more divergent HCV variants, such as subtypes and genotypes, is clearly pointless, as the number of neutral sites or the limitations on sequence change at variable sites is not known, so there is no denominator with which to calculate and correct for multiple substitutions. The constriction of sequence space of viruses such as HCV with GORS implies that many of the branches that are evident on phylogenetic analysis of contemporary sequences that define virus species, genotypes or genera occurred at remote times in the past. In making the molecular clock-based estimates above of 350–1000 years for the time of divergence of genotypes, we are therefore in danger of telescoping a much longer period of virus evolution into an unrealistically short time-frame.
A much longer time perspective on HCV evolution, provided by our understanding of GORS constraints, fits much better with the globally distributed nature of HCV and the concentration of specific genotypes with historically relatively isolated populations in sub-Saharan Africa and south Asia. As a potential comparison, GORS in the widely distributed human virus hepatitis G virus/GB virus C appears to have restricted sequence drift to 11–13 % nucleotide sequence divergence over the course of evolution of modern humans over the last 100 000–150 000 years (González-Pérez et al., 1997; Pavesi, 2001; Simmonds, 2001). The greater sequence diversity between HCV genotypes implies times of origin that occurred even further back in the evolution of humans..."
So, probably during a mammoth hunt.
http://www.biology-online.org/articles/origin-evolution-viruses-escapeddna-rna/origin-evolution-viruses.html
ML
fret
http://www.youtube.com/watch?v=mMEPV-NTeZs&feature=channel_page
http://www.ted.com SARS, avian flu, swine flu ... each virus outbreak raises the question: What can be done? A compelling answer from virus hunter Nathan Wolfe, who's outwitting the next pandemic
alijee, I am kidding but the chicken did bite me.
Denise
"...The stupid virus you speak of has plagued mankind for thousands of years, probably dating back to pre-civilization. This stupid virus, against all odds, has found ways to adapt, mutate, and survive within the heavily protected human body and to infect other organisms, spreading to all corners of the world colonized by human race, in an almost unprecedented way. It is interesting to think that, if the mode of transmission of hepatitis C is pretty much exclusively by blood transfusions, needles etc, how was it able to survive as a species before modern times (before blood transfusions, injectable drugs, surgical procedure etc even existed)? Some speculate that there is one answer: war. Through wounds that occurred in battle, warriors from all cultures would pass on the virus to their surviving enemies."
With the blood to blood transmission being required, I wonder if hep c isn't just a mutation of one of the other viral heps. I share the same curiosity as Granitekonig's letter writer. How the heck did the virus even survive without medical treatments, transfusions and injections, all only existing for the last century. Seems like a pretty poor survival method for an organism
ML
I have stated quite a few times that HCV had to be self-replicating at one time and that most likely it had origins from some self-replicating life form. (This is theory #1 in the article. Once the original organism learned to enter cells and hijack the replication machinery of the host cell it no longer needed to self-replicate so it 'shed' those parts of the organism used for self-replication that were no longer needed to exist. HCV is in a nearly perfect free energy state as over time it has evolved to become more and more efficient and has 'shed' everything else that it no longer needs to exist. To me, logic dictates viruses had to first be an organism that was self-replicating. How could HCV for example, infect the human body and already have the ability to enter hepatocytes, and use the host cell's replicative system to generate viral copies ?
Its theorized that HCV has become an entity that does not fit the definition of life as we know it through this process of descension. Some take the fencesitting approach that viruses exist somewhere between the living and the dead. Until someone can create a new category with defined attributes to support this I will continue to view viruses as non-living entities. Viruses have no brain nor nervous system, it needs no sustenance to survive, cannot replicate by itself, does not need water (its said that all living things need water) etc,etc. Thanks for the post and I hope my explanation makes my position more coherent.
ML
This has been a fun topic. Reminds me that if one is an addict, they can spend a lot of time trying to figure out why they are an addict or they can just accept that they are and that the only way to beat it is to not use anymore.
Joey
Are you my Daaaadddyy?