Better low-cost DNA hair analysis for catching criminals

www.scienceknowledge.org


Better DNA hair analysis for catching criminals

A simple, lower-cost new method for DNA profiling of human hairs developed by the University of Adelaide should improve opportunities to link criminals to serious crimes. The researchers have modified existing laboratory methods and been able to produce accurate DNA profiles from trace amounts at a much higher success rate.

Forensic DNA
Evidence on Trial:
Science and Uncertainty
in the Courtroom

by Victoria Grace

Order new and used from
Powell's Books
"Technological advancements over the last 10 years have allowed police and forensic scientists to profile crime-scene DNA from ever smaller and more challenging samples collected from fingerprints, skin cells, saliva and hairs," says Associate Professor Jeremy Austin, Deputy Director with the University's Australian Centre for Ancient DNA.

"DNA profiling of human hairs is critical to solving many serious crimes but most hairs found at crime scenes contain very little DNA because it has been severely dehydrated as part of the hair growth process. This makes DNA testing of hairs a real challenge."

Through an Australian Research Council (ARC) Linkage Project , the researchers, in collaboration with colleagues at the University of Canberra, set out to develop a new method that could produce better results, published in the journal Forensic Science, Medicine and Pathology.

University of Adelaide post-graduate student Janette Edson carried out the detailed genetic analysis of hundreds of shed human hairs collected from volunteer donors.

"Existing methods to obtain and interpret DNA profiles from shed human hairs are expensive and often unsuccessful," says Associate Professor Austin, who leads the advanced human forensic identification program at the University of Adelaide.

"Our research shows that we can retrieve DNA profiles from shed human hairs that contain trace amounts of DNA without compromising the accuracy of our results. Previous methods required specialist and expensive laboratories."

Lead-author Assistant Professor Dennis McNevin, from the University of Canberra, says: "Our simple modifications will allow this trace DNA to be analysed in a standard forensic laboratory with improved success rates of DNA profiling and without increased error rates.

"This is very important in forensic science as false positive results can lead to incorrect identifications and poor outcomes in the judicial system."

Related stories:
Story Source:  Materials provided by University of Adelaide.  Dennis McNevin, Janette Edson, James Robertson, Jeremy J. Austin. Reduced reaction volumes and increased Taq DNA polymerase concentration improve STR profiling outcomes from a real-world low template DNA source: telogen hairs. Forensic Science, Medicine, and Pathology, 2015

Comments

Post a Comment

Popular posts from this blog

Workout supplements: An emerging eating disorder in men?

Image
therewontbeanydoves.wordpress.com When developing a fictional character, you may not think about the character using large amounts of over-the-counter dietary supplements.  Especially a man who uses large amounts of workout supplements. While there has been widespread publicity on the dangers of the non-prescribed use of anabolic steroids, not much is said about legal, over-the-counter supplements.  Are there risks?  And if so, what are they?  There are several things the writer should consider. Supplement use is becoming an eating disorder with many men who use them to prepare for and recover from a workout. There is growing evidence of a link between muscle-building supplements and testicular cancer. There is evidence that over-the counter medications and supplements are the most common causes of drug-induced liver failure (a rare event, but still a risk.)  There is even evidence that, “certain popular herbal and dietary supplements can also ...
Read more

Remember faces but not names? You got it wrong.

Image
Source:   Daily Excelsior So, you think you're good at remembering faces, but terrible with names? New research has revealed we are actually better at remembering names than faces The cringe-worthy experience of not being able to remember an acquaintance's name leads many of us to believe we are terrible with names. However, new research has revealed this intuition is misleading; we are actually better at remembering names than faces. With the Christmas party season fast approaching, there will be plenty of opportunity to re-live the familiar, and excruciatingly-awkward, social situation of not being able to remember an acquaintance's name. This cringe-worthy experience leads many of us to believe we are terrible at remembering names. However, new research has revealed this intuition is misleading; we are actually better at remembering names than faces. The authors of the study, from the University of York, suggest that when we castigate ourselves f...
Read more

Children's drawings during abuse investigations

Image
Source:  rutherfordcountytn.gov I llustrations by children can be a critical tool in forensic investigations of child abuse. A recent study compared the results when child abuse victims were offered the opportunity to draw during questioning with results when victims were not offered this opportunity. "The act of drawing was not only an empowering experience for these children," said Dr. Katz. "We also found it to be forensically more effective in eliciting richer testimonies in child abuse cases. We had no idea the gap would be so great between those who drew and those who weren't given this option." A chance to express themselves Some 125 alleged child victims of sexual abuse were randomly selected for the field study. The children, aged 5-14, were questioned by nine well-trained forensic interviewers about a single occurrence of alleged sexual abuse. The children were divided into two sets -- a control group, questioned and allowed to rest during t...
Read more

M.I.T. Research Explains How Will Rogers Observation Works

Image
Finally it appears that MIT has gotten involved in proving Will's syllogism, "There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." Read his statement carefully.   ONE learns by reading.   A FEW who learn by observation. Then there's the rest of us. The reason for this, it turns out, is a special circuit in the brain that you or I need to have a functioning version of to actually learn by observing others.  Based on how we all behave, it is a circuit most of us must be missing.   Or perhaps it shorted out the first time we peed on an electric fence and it has yet to grow back.   *  *  *  *  * Brain circuit helps us learn by watching others Scientists pinpoint neural interactions that are necessary for observational learning Researchers have identified a brain circuit requir...
Read more

Unhappy in a relationship? Why do you stay?

Image
Source:   Power of Positivity A story that may effect the development of your romantic comedies.  Why do people stay in unhappy relationships?  Simply put, it's concern for the partner of the unhappy person. This research doesn't offer solutions to this situation, but does help our understanding of why people behave the way they do. NOTE:  Within five minutes this post had 16 hits, the fastest hit rate of any story I've posted.  Might say something of how people feel. Here's the story: *  *  *  *  * When you are unhappy in a relationship, why do you stay?  The answer may surprise you. Study that finds it's not just the investment of time, resources and emotion Why do people stay in unsatisfying romantic relationships? A new study suggests it may be because they view leaving as bad for their partner. The study, being published in the November 2018 issue of the Journal of Personality and Social Psychology, e...
Read more