New DNA Test Could Transform Diagnosis of Rare Genetic Disorders
According to a recent study, a new DNA test could make it easier and faster to diagnose people with rare genetic disorders. This study was published in the New England Journal of Medicine. Researchers have believed that this test could eventually replace many of the separate genetic tests currently used in hospitals and become the first choice for diagnosing rare diseases.
Scientists from Radboud University Medical Center and Maastricht University Medical Center were leading the study in the Netherlands, and the team tested a technology called long-read genome sequencing on around 1000 patients who were suspected of having a rare genetic disorder.
There are so many people who are affected by rare diseases worldwide, but getting an accurate diagnosis is often a very long and tiring process and many patients spend years just undergoing multiple tests before identifying the cause of their condition. It is also said that in many cases, they never even receive a clear diagnosis.
However, the new DNA test aims to change that.
What Makes This New DNA Test Different?
To explain the difference between existing DNA tests and the new approach, the researchers used a jigsaw puzzle analogy. Traditional genetic testing reads DNA in small fragments, similar to trying to complete a large puzzle using thousands of tiny pieces.
Study Shows Higher Diagnostic Success
“We showed that the new DNA test yields 3% more diagnoses. It can also replace 15 other tests. We recommend using this test worldwide as the first choice,” said the Professor of Translational Genomics Lisenka Vissers.
While a 3% increase may sound small, researchers say it is highly significant for patients who have spent years searching for answers. For many families, receiving a diagnosis can provide clarity, guide treatment decisions, and help them understand the risk of the condition affecting other family members.
Detecting More Genetic Changes in a Single Test
“Therefore, it’s important that we measure those as well. With current diagnostics, this requires additional specialized tests, but with long reads we capture these modifications as a bonus – two in one”, explained Christian Gilissen, Professor of Genome Bioinformatics.
The researchers also found that the new DNA test could detect several different types of genetic variations in a single analysis. This means patients may no longer need to undergo multiple separate tests, reducing both the time and cost involved in reaching a diagnosis.
Could Long-Read Sequencing Become the New Standard?
According to the research team, long-read genome sequencing has the potential to replace as many as 15 existing genetic tests currently used in clinical practice. Because it provides a more complete view of a person’s DNA, it can uncover complex genetic changes that are difficult to identify using older technologies.
The findings have led researchers to suggest that long-read genome sequencing should be considered as a first-line diagnostic test for people with suspected rare genetic disorders. They believe wider adoption of the technology could improve diagnostic rates and shorten the diagnostic journey for many patients.
Although further work is needed before the DNA test becomes widely available in healthcare systems around the world, experts say the results are promising. As DNA sequencing technologies continue to improve and become more affordable, they could help thousands of families receive faster and more accurate answers about rare genetic conditions.
