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Likely pathogenic – de novo — RACP Paediatrics MCQ

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ModerateGeneticsLikely pathogenic – de novoRACP Paediatrics

Exome sequencing finds a novel de novo variant in a known disease gene relevant to the patient's phenotype. In-silico tools conflicting. How is it classified per ACMG?

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Correct answer: CLikely pathogenic – actionable

De novo variant (strong pathogenicity evidence PS2) in a known gene matching phenotype = likely pathogenic even if novel. Actionable for clinical decisions.

Reference: RACP Paediatric Curriculum – Genetics; ACMG – 2015