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Genome-based diagnostics – Methods & Applications

Genome-based diagnostics analyses a person's genetic material to detect diseases early, assess genetic risks, and enable personalised treatment strategies.

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Things worth knowing about "Genome-based diagnostics"

Genome-based diagnostics analyses a person's genetic material to detect diseases early, assess genetic risks, and enable personalised treatment strategies.

What is genome-based diagnostics?

Genome-based diagnostics is a modern medical approach in which the genome – the complete set of genetic information of a person – is examined. The goal is to identify disease-relevant changes in the genetic material, detect genetic risk factors at an early stage, and provide the basis for personalised treatment. The method is also referred to as genomic diagnostics and is a core element of precision medicine.

Methods of genome-based diagnostics

Modern genome-based diagnostics relies on several molecular genetic technologies:

Next-Generation Sequencing (NGS): A high-throughput sequencing technique that analyses large sections of the genome or the entire exome or genome in a short time.
Whole Genome Sequencing (WGS): Complete decoding of all approximately 3 billion base pairs of the human genome.
Whole Exome Sequencing (WES): Analysis of the protein-coding regions of the genome (exome), which account for around 85% of all known disease-causing mutations.
Targeted gene analyses (panel diagnostics): Examination of specific genes or gene panels associated with particular diseases.
Chromosomal microarray analysis (CMA): Detection of copy number variations (CNVs) in the genome that cannot be detected by classical methods.

Areas of application

Genome-based diagnostics is used across numerous medical specialties:

Rare diseases

For patients with unexplained symptoms or suspected rare genetic disorders, genomic diagnostics can often provide a diagnosis after years or even decades of a diagnostic odyssey. Many rare diseases are monogenic, meaning they are caused by variants in a single gene.

Oncology

In cancer medicine, genome-based diagnostics enables the precise characterisation of tumours at the molecular level. By analysing somatic mutations (alterations present only in tumour tissue), targeted therapies can be selected and resistance mechanisms identified.

Prenatal and preimplantation diagnostics

Genomic methods allow early detection of chromosomal abnormalities and genetic disorders in the unborn child, for example through non-invasive prenatal testing (NIPT) or preimplantation genetic diagnosis (PGD) in the context of assisted reproduction.

Pharmacogenomics

Pharmacogenomics investigates how genetic variants influence a person's response to medications. This enables individualised drug selection and dosing to minimise side effects and improve therapeutic efficacy.

Preventive medicine

By identifying genetic risk factors, targeted preventive measures can be initiated, for example in individuals with an elevated risk of breast or colorectal cancer due to variants in genes such as BRCA1/2 or Lynch syndrome-associated genes.

Diagnosis and procedure

The typical process of genome-based diagnostics involves the following steps:

Indication: A physician or human geneticist decides, based on the clinical presentation, which genomic investigation is appropriate.
Sample collection: A blood sample is usually taken; for tumour diagnostics, tissue may also be used.
Laboratory analysis: The sample is sequenced in a laboratory and evaluated using bioinformatics tools.
Result interpretation: Specialised human geneticists and bioinformaticians interpret the findings and classify genetic variants according to their clinical significance.
Genetic counselling: The results are explained in a consultation, and potential implications for the patient and their family are discussed.

Opportunities and limitations

Genome-based diagnostics offers enormous potential for modern medicine but also has limitations and raises ethical questions:

Opportunities

Early diagnosis of genetic conditions
Personalised and targeted therapy planning
Reduction of unnecessary diagnostic procedures
Improved quality of life through targeted treatment

Limitations and ethical aspects

Not every genetic variant can be clearly classified as disease-causing (variants of uncertain significance, VUS).
Incidental findings can cause psychological distress.
Data protection and the safeguarding of genetic information are key ethical challenges.
High costs and limited availability in some healthcare settings.

References

Metzker ML. Sequencing technologies – the next generation. Nature Reviews Genetics, 2010; 11(1): 31–46.
World Health Organization (WHO): Human Genomics in Global Health. WHO, Geneva, 2022.
Ginsburg GS, Phillips KA. Precision Medicine: From Science to Value. Health Affairs, 2018; 37(5): 694–701.

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