Clinical Exome Sequencing

Clinical exome sequencing is a crucial tool in modern medicine, providing a detailed understanding of the genetic foundations of many diseases. Utilizing this technology for diagnosis and personalized treatment can greatly enhance the quality of healthcare. At IntroLab in Belgrade, patients have access to this advanced genetic analysis, along with expert genetic counseling, helping them better understand their health condition and make informed decisions about their treatment.

What is the exome?

The exome is the portion of the human genome that includes all the coding sequences of genes, known as exons. Exons are segments of DNA that are translated into proteins, the essential building blocks of cells and tissues. Although the exome comprises only about 1-2% of the entire genome, it contains approximately 85% of known mutations that cause monogenic diseases. The remainder of the genome, including introns and other non-coding regions, does not directly code for proteins but may have important regulatory functions.

Significance of the exome

The exome is especially important in genetic research and clinical diagnostics because most known inherited diseases are caused by mutations in the coding regions of genes. Analyzing the exome allows for the identification of potentially harmful mutations that may lead to diseases or increase a person’s susceptibility to certain conditions.

Clinical exome sequencing

Clinical exome sequencing (CES) is an advanced genetic analysis that focuses on identifying genetic variations in the exonic sequences of the human genome. This method utilizes Next Generation Sequencing (NGS) technology to analyze exons, allowing for the precise and rapid detection of clinically relevant genetic mutations. Exome sequencing offers insights into variations that affect protein coding, which can directly influence a patient’s clinical condition.

Exome analysis has become an essential tool in genetics, particularly in diagnosing rare diseases, as well as in children with developmental delays and autism spectrum disorders. Quickly identifying genetic causes enables more effective and personalized therapeutic approaches, greatly enhancing the quality of life for patients.

How does clinical exome sequencing work?

The clinical exome sequencing process involves the following steps:

• Sample collection: A blood or saliva sample is collected from the patient, and DNA is extracted.
• Exome enrichment: Specific exons are isolated from the entire DNA using probes that target exon sequences.
• Sequencing: The enriched exons are sequenced using NGS technology, providing a detailed reading of the genetic code.
• Data analysis: The sequenced data is analyzed with bioinformatics tools to identify mutations.
• Result interpretation: Geneticists interpret the results, identifying relevant mutations and assessing their potential impact on the patient’s health.

When is clinical exome sequencing used?

Clinical exome sequencing is utilized in various medical fields:

• Diagnosis of rare diseases: CES can help identify genetic causes when symptoms are complex and unclear.
• Neurology: To detect mutations responsible for neurological disorders such as epilepsy, autism, and intellectual disabilities.
• Cardiology: To identify genetic mutations linked to inherited heart diseases.
• Oncology: To uncover genetic predispositions to specific types of cancer.
• Metabolic disorders: CES aids in diagnosing inherited metabolic diseases.

Advantages and limitations of clinical exome sequencing

Clinical exome sequencing offers several advantages, including its comprehensiveness and efficiency. It allows for the simultaneous analysis of a large number of genes, which is particularly valuable for the rapid and accurate diagnosis of complex genetic disorders. Additionally, it supports personalized medicine by customizing treatment based on the patient’s specific genetic profile.

However, there are limitations. This method focuses solely on the coding regions of genes, potentially missing mutations in non-coding regions of DNA that may also be important. It can also identify variants of uncertain significance, which can complicate the interpretation of results. Moreover, ethical and privacy considerations must be carefully addressed when handling genetic information, and proper genetic counseling is essential.

Specialized genetic testing panels

IntroLab offers specialized genetic panels that provide detailed analysis of hereditary disorders using advanced NGS methods. The available panels include:

• Autoinflammatory diseases panel
• Cardiomyopathy panel
• Arrhythmia panel
• Marfan syndrome panel
• Epilepsy panel
• Molecular karyotyping

Prenatal genetic tests at IntroLab

In addition to these panels, we offer a variety of prenatal tests that allow for the early detection of genetic abnormalities during pregnancy. The available tests include:

• Prenatal BASIC Test
• Prenatal PLUS Test
• Prenatal EXPERT Test
• Prenatal PREMIUM Test
• Prenatal SPECIAL Test
• Prenatal SPECIAL + SMA Test

These tests are designed to provide essential information about the fetus’s health, which can be crucial for timely medical interventions.