Getting Misfolding Proteins to Shape Up

Transthyretin is a protein found in the blood. Its name reflects its function, which is to transport thyroxine and retinol. In the case of a number of rare conditions, the protein becomes unstable and misfold, causing it to accumulate as toxic protein deposits in the heart or peripheral nerves. Eidos Therapeutics, a subsidiary of BridgeBio, is developing an experimental small molecule drug that binds and stabilizes transthyretin in the blood. We spoke to Jonathan Fox, chief medical officer of Eidos, about the rare diseases it is targeting, the treatments available today, and how it may change the landscape for these conditions.