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Exome sequencing workflow: part 1. Exome sequencing, also known as whole exome sequencing (WES), is a genomic technique for sequencing all of the protein-coding regions of genes in a genome (known as the exome). [1] It consists of two steps: the first step is to select only the subset of DNA that encodes proteins.
Whole-exome sequencing is a recent technology that has led to the discovery of various genetic disorders and increased the rate of diagnoses of patients with rare genetic disorders. Overall, whole-exome sequencing has allowed healthcare providers to diagnose 30–50% of patients who were thought to have rare Mendelian disorders.
The DNA sequencing methods used in the 1970s and 1980s were manual; for example, Maxam–Gilbert sequencing and Sanger sequencing. Several whole bacteriophage and animal viral genomes were sequenced by these techniques, but the shift to more rapid, automated sequencing methods in the 1990s facilitated the sequencing of the larger bacterial and ...
Whereas the methods above describe various sequencing methods, separate related terms are used when a large portion of a genome is sequenced. Several platforms were developed to perform exome sequencing (a subset of all DNA across all chromosomes that encode genes) or whole genome sequencing (sequencing of the all nuclear DNA of a human).
The methods that are the most commonly used are whole exome sequencing and whole genome sequencing. Both approaches are used to identify genetic variations. Genome sequencing became more cost-effective over time, and made it applicable in the medical field, allowing scientists to understand which genes are attributed to specific diseases.
Exome sequencing utilizes exome capture to acquire the protein coding regions of the genome. It is unbiased, however, it will not yield off target mutations in the non-coding region of the genome. In case of whole genome sequencing, the entire genome is screened for off target mutations. Currently, this method is expensive and like exome ...
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