What is the key difference between Sanger sequencing and Next-Generation Sequencing (NGS)?

Question

BlackTom AI · Accepted Answer

To address the question, we need to compare the fundamental throughput difference between Sanger sequencing and Next-Generation Sequencing (NGS).
Option 1: 'Sanger uses RNA, NGS uses DNA.' This is incorrect because Sanger sequencing analyzes DNA templates (not RNA) after reverse transcription when needed, and NGS also sequences DNA (and can sequence cDNA in RNA workflows). The statement misstates the basic molecules involved.
Option 2: 'Sanger sequencing does not require primers.' This is false; Sanger sequencing relies on a primer to initiate DNA synthesis for each reaction. Primers are essential for directing the DNA polymerase to the correct start site, so the claim is inaccurate.
Option 3: 'Sanger is faster than NGS.' In practice, Sanger can be quick for a single, small DNA fragment, but when many fragments or whole genomes are involved, NGS vastly outpaces Sanger due to its parallel processing and higher throughput. Therefore this broad claim is misleading.
Option 4: 'Sanger sequences one DNA fragment at a time, while NGS sequences millions of fragments in parallel.' This statement captures the core distinction: Sanger reads a single DNA fragment per reaction, yielding long, individual reads, whereas NGS platforms perform massively parallel sequencing, generating millions or billions of short reads simultaneously. This difference in scale explains why NGS is preferred for large-scale projects, while Sanger remains useful for targeted, small-scale sequencing or validation.

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