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What can smiling bands in restriction digest gel indicate?

Answer and explanation

Correct answer: Uneven heating or high voltage

Direct answer: Option A, smiling bands can indicate uneven heating or an overly high voltage during gel electrophoresis. In a properly run gel, bands travel in reasonably straight, even paths. Excessive voltage can heat the buffer, and uneven temperature or conductivity can make migration faster near the edges than in the centre, bending bands upward like a smile. Check voltage, buffer volume and concentration, gel setup, and temperature; also ensure the gel is properly cast. Option A is correct. Option B is too narrow and unrelated: an enzyme-name error does not produce the characteristic migration shape. Option C is wrong because smiling is not evidence only of DNA methylation. Option D is wrong because no buffer is not the only explanation and a gel cannot run normally without buffer. Memory cue: smiling bands suggest a running-condition problem.

Related tags

Smiling BandsHigh VoltageGel Condition

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