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# Finding genes and testing

How the gene behind a disease is found, and the techniques that read DNA.

5 pages

- [**How disease genes are found: linkage, association and sequencing** Three strategies find the genes behind diseases: tracking markers through families, comparing…](https://durgical.com/en/biochemistry/topics/how-disease-genes-are-found-linkage-association-and-sequencing/)
- [**DNA sequencing** Sequencing means reading the exact order of DNA bases; today you can read one gene, all exons…](https://durgical.com/en/biochemistry/topics/dna-sequencing/)
- [**Polymerase chain reaction (PCR)** PCR copies one chosen piece of DNA millions of times in a few hours; it underpins molecular…](https://durgical.com/en/biochemistry/topics/polymerase-chain-reaction/)
- [**Southern, Northern and Western blots** Blots separate molecules by size in a gel, move them to a membrane and detect them with a probe…](https://durgical.com/en/biochemistry/topics/southern-northern-and-western-blots/)
- [**Molecular pathology: PCR, FISH, sequencing and liquid biopsy** Molecular tests read the genes of a tumour or a microbe to confirm the diagnosis and choose the…](https://durgical.com/en/general-pathology/molecular-pathology-pcr-fish-sequencing-and-liquid-biopsy/)

[← Medical genetics](https://durgical.com/en/genetics/)

This section is an index: it gathers pages from Biochemistry, Pathology, Embryology and other sections without repeating them. Educational content; it does not replace a geneticist's assessment or genetic counselling.

Representative model, for educational purposes only.

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Source: https://durgical.com/en/genetics/testing/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/genetics/testing/