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Biochemistry, cell biology, and genetics

Sequencing, variant interpretation, and genetic testing

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SAMPLE QUESTION

Sequencing in a child with unexplained weakness identifies a heterozygous base substitution. It is supported by 47 of 96 independent, high-quality reads and is reproduced by a second sequencing method on a new specimen. No disease association, functional study, or family result is available for this substitution.

Which conclusion is most directly strengthened by the second result?