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The Boston Globe

Health & wellness

The benefits, limits of DNA sequencing

One family’s quest to understand hearing loss gave them answers, but also questions they still wonder about

LANCASTER, N.H. — Jeanne and Andy Nadeau had one gnawing question about their large family: Would the hearing loss that affects half of their busy, boisterous household of 10 children worsen as the children grew older?

The Nadeaus could prepare for the future if they knew whether the children who whisper in shouting voices and sleep soundly through violent thunderstorms would eventually become deaf or develop other health issues. Jeanne could make sure they learned sign language.

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