Whole Genome Sequencing is a technique that enables the determination of the complete genetic material and can be used in the diagnosis of many genetic diseases.
What is Whole Genome Sequencing?
Whole Genome Sequencing (WGS) is a DNA sequencing technique that determines the entire DNA sequence of an individual or organism. The goal is to obtain the full sequence of the genome.
This technique is increasingly used in disease diagnosis and research to identify genetic variants. Since a significant proportion of disease-related variants occur in exons, 'Whole Exome Sequencing' is an effective clinical approach; our expertise in this area contributes to more accurate data interpretation and reporting.
However, in cases where diagnosis cannot be achieved through exome sequencing alone—such as those requiring haplotype analysis for drug sensitivity evaluation, or involving rearrangements or repeat expansions that are difficult to detect—whole-genome sequencing techniques are now required.
Key Steps of Whole Genome Sequencing
- Sample Collection: Appropriate samples such as blood, tissue biopsy, or cell culture are collected from the individual to obtain DNA.
- DNA Isolation: DNA is isolated from the collected material in the laboratory using suitable chemical and physical methods.
- DNA Fragmentation: The isolated DNA is fragmented into pieces of specific sizes.
- DNA Sequencing: The fragmented DNA is read by high-throughput sequencing devices, and the nucleotide sequence is determined.
- Data Analysis: The obtained sequences are analyzed using bioinformatics tools to identify genes, variants, and structural features.
- Interpretation of Results: The findings are evaluated by experts, and genetic risks and clinically significant alterations are reported.
In Which Situations is Whole Genome Sequencing Used?
- Single-Gene Disorders: It can assist in diagnosing conditions such as cystic fibrosis, Huntington’s disease, Duchenne muscular dystrophy, or congenital hypothyroidism.
- Cancer Genomic Analysis: Sequencing of tumor tissue can reveal actionable mutations and enable personalized treatment strategies.
- Identification of Genetic Variants: Population-based polymorphisms and risk factors can be uncovered.
- Carrier Status Evaluation: Useful for guidance in premarital or preconception genetic screening.
- Structural Variations and Rearrangements: Chromosomal alterations, translocations, and large-scale variations can be detected.
- Metabolic Disorders: It can be used to investigate genetic causes of metabolic diseases such as phenylketonuria.
- Rare Genetic Syndromes: Helps clarify the genetic basis of complex and rare clinical conditions.
- Pharmacogenomic Applications: Genetic factors influencing drug metabolism can be evaluated for personalized medicine.
Whole Genome Sequencing can be used for a wide range of clinical and research purposes. The following are primary examples:
Whole Genome Sequencing is a powerful tool that allows an in-depth understanding of an individual’s genetic profile. It can be applied in diagnosing genetic diseases, determining carrier status, discovering new variants, and implementing personalized medicine. As this comprehensive analysis generates large amounts of data, ethical principles, privacy, and personal data protection must be strictly observed.