An international team of researchers from Adelaide and the United States has engineered bacteria capable of detecting mutated DNA released from colorectal cancer cells, opening the door to faster disease detection.
Led by Dr Dan Worthley, Associate Professor Susan Woods and Dr Josephine Wright from SAHMRI and the University of Adelaide, in partnership with Professor Jeff Hasty at the University of California San Diego (UCSD), the study was published today in the prestigious journal, Science.
The team engineered bacteria called Acinetobacter baylyi (A. baylyi), which is known for its ability to sample and integrate DNA from its environment. Researchers leveraged this natural competence to detect the mutated KRAS gene, an important driver of colorectal cancer.
A/Prof Woods says they dubbed this technology ‘CATCH’, which stands for, Cellular Assay of Targeted CRISPR-discriminated Horizontal gene transfer.
“CATCH has the potential to detect bowel cancer early with the aim of preventing more people from dying of this and other cancers,” she said.
“This study demonstrates how bacteria can be designed to detect specific DNA sequences to diagnose disease in hard-to-reach places.”
In preclinical testing, the team found that the sensor bacteria were 100% accurate in differentiating between models with and without colorectal cancer.
“We were thrilled to see transfer of DNA from the tumour to the sensor bacteria,” A/Prof Woods said.
“This shows that our biosensing system can be used to catch colorectal cancer DNA within a complex ecosystem.”
Dr Dan Worthley says potential applications of the technology extend beyond cancer.
“In the future we will detect and prevent many diseases, including bowel cancer, with cells, not drugs,” he said.
“We hope that this invention, of life detecting life, will be useful for clinicians, scientists and engineers to help the community wherever and whenever DNA detection is important.”.
While further studies are needed before progressing to clinical trials, researchers are confident this latest discovery represents a significant advance in the field of living diagnostics while setting the stage for the timely and accurate delivery of targeted treatments.
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Healthcare associated infection prevention
Professor Philip Russo is an internationally regarded expert in healthcare associated infection prevention, and led the recently completed the Australian National Healthcare Associated Infection Point Prevalence Survey, the first in Australia for 34 years. He is also Past President of the Australasian College for Infection Prevention and Control (ACIPC), the peak body for Infection Prevention and Control professionals in the Australasian region.
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Investigating the benefits of donor human milk for preterm infants
Together, SAHMRI and Lifeblood are leading a consortium to revolutionise the way human milk, and novel products made from human milk, are used as nutritional and medical interventions to improve health outcomes in vulnerable infants, but with potential application for a diverse range of medical indications.
Currently, babies who are born early preterm – before 32 weeks – are given donor milk when their own mother’s milk is not available or in short supply. Whether donor milk is beneficial for babies born just a few weeks early is unclear, as very little research has been undertaken with these babies.
The GIFT Trial will soon commence as an investigation between SAHMRI, the University of Adelaide, the Red Cross Lifeblood Milk Bank conducted at five sites across three states in Australia.
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Causal genes and pathogenic mechanisms underlying gastrointestinal diseases
Professor D’Amato has more than 25 years research experience in the field of human genetics and complex diseases, with activities most recently geared towards a translational application for therapeutic precision in gastroenterology. His team, the Gastrointestinal Genetics Laboratory, combine leading expertise in genomic, computational and pre-clinical research, and have contributed important breakthroughs linking specific genes and pathogenetic mechanisms to a number of gastrointestinal diseases like inflammatory bowel disease (IBD), microscopic colitis (MC) and irritable bowel syndrome (IBS).
