Genetic testing is a useful tool for determining the cause of health conditions in children by identifying genetic variations that may be associated with a specific disease. Understanding genetic test reports can be challenging, but having a grasp on the basics of genetics and types of genetic tests can make interpretation easier.
Genes are the body’s instruction manual, with approximately 20,000 genes that build the body and provide instructions to produce proteins. These genes are housed on chromosomes, with most people inheriting 46 chromosomes, or 23 pairs, from their parents. The Human Genome Project has helped scientists understand the correct “spelling” of genes, and deviations can result in medical problems, such as hyperinsulinism (HI).
Genetic testing aims to identify misspelled genes that could help understand a condition like HI. This information assists healthcare providers in deciding the best course of treatment and predicting health risks for other family members.
Various genetic tests are available, including single gene testing, gene panel testing, and more comprehensive approaches like exome or genome sequencing. After testing, results fall into three categories: positive, negative, or variant of uncertain clinical significance (VUS).
A positive result indicates a change in a gene linked to HI, though its impact depends on whether the gene is dominant or recessive. A negative result shows no found genetic changes but does not eliminate the possibility of a genetic cause. VUS results indicate genetic changes where the impact is uncertain, requiring further study to determine their significance.
Examples of genetic test results include sections such as gene transcript, mode of inheritance, DNA variants, ClinVar ID, allele frequency, in silico predictions, and interpretation. Positive results include a detailed breakdown of findings, while VUS results point out changes with unclear implications.
For those who find genetic reports difficult to understand, it is advisable to consult with the healthcare provider or a genetic counselor for a more comprehensive explanation. Understanding some parts of these reports could still be tough, but the support of knowledgeable professionals can help navigate these intricacies.
