Some people wonder what evolution is good for. Here is an example. For those of you who think evolution is wrong, do you think we should set these convicted criminals free?
Scientists reveal criminal virus spreaders using evolutionary forensics | Bioscience Technology Online
"The source of HIV infection in two separate criminal cases in which men were convicted of intentionally infecting their female sexual partners was confirmed by scientists from The University of Texas at Austin and Baylor College of Medicine using evolutionary forensics. ...
"HIV evolves rapidly within infected individuals over the course of a few months, so the viruses cannot be compared between a source and a newly infected individual for an exact match. It's not as easy as directly comparing two individuals' DNA to confirm paternity.
Even two samples of HIV from the same person, taken several months apart, will be different because the virus is evolving so quickly.
"Within a given person, there is not just one strain but a population of strains because HIV mutates all the time when it makes new virions (viral particles)," said Metzker, associate professor at Baylor. "During transmission, however, there is a genetic bottleneck in which only one or two viruses get transmitted to the recipient." ...
"
In order to understand the origins of the infections of the women victims, therefore, the scientists needed to reconstruct the evolutionary history of the viruses.
To do so, Metzker's lab at Baylor College of Medicine first isolated and sequenced the HIV genes from blind blood samples taken from the accused, from the victims and from other HIV positive individuals who lived in the same area as the victims and the accused.
Metzker sent the gene sequences (still blind to identity) to the Hillis lab at The University of Texas at Austin, where they constructed evolutionary histories for the viruses by performing the phylogenetic analysis.
In each of the cases, they identified the sample from the unknown individual that shared the subsets of HIV genes that were related to the other individuals in the case.
"This individual was the only person who could have infected the others," said Hillis.
In each case, the source individual was revealed at the trial to be the defendant when the blinded code numbers on the blood sample were revealed to the court.
"We didn't know that information until the trial," said Hillis. "We just new that we had identified the only person whose HIV population was consistent as the source of the multiple infections." "
Scientists reveal criminal virus spreaders using evolutionary forensics | Bioscience Technology Online
"The source of HIV infection in two separate criminal cases in which men were convicted of intentionally infecting their female sexual partners was confirmed by scientists from The University of Texas at Austin and Baylor College of Medicine using evolutionary forensics. ...
"HIV evolves rapidly within infected individuals over the course of a few months, so the viruses cannot be compared between a source and a newly infected individual for an exact match. It's not as easy as directly comparing two individuals' DNA to confirm paternity.
Even two samples of HIV from the same person, taken several months apart, will be different because the virus is evolving so quickly.
"Within a given person, there is not just one strain but a population of strains because HIV mutates all the time when it makes new virions (viral particles)," said Metzker, associate professor at Baylor. "During transmission, however, there is a genetic bottleneck in which only one or two viruses get transmitted to the recipient." ...
"
In order to understand the origins of the infections of the women victims, therefore, the scientists needed to reconstruct the evolutionary history of the viruses.
To do so, Metzker's lab at Baylor College of Medicine first isolated and sequenced the HIV genes from blind blood samples taken from the accused, from the victims and from other HIV positive individuals who lived in the same area as the victims and the accused.
Metzker sent the gene sequences (still blind to identity) to the Hillis lab at The University of Texas at Austin, where they constructed evolutionary histories for the viruses by performing the phylogenetic analysis.
In each of the cases, they identified the sample from the unknown individual that shared the subsets of HIV genes that were related to the other individuals in the case.
"This individual was the only person who could have infected the others," said Hillis.
In each case, the source individual was revealed at the trial to be the defendant when the blinded code numbers on the blood sample were revealed to the court.
"We didn't know that information until the trial," said Hillis. "We just new that we had identified the only person whose HIV population was consistent as the source of the multiple infections." "
