• A companion for the TK2d journey

    The information, insights and support you need every step of the way

    Find what you are looking for no matter where you or your child are on the TK2d journey. Get started today.

    TAKE THE PATIENT JOURNEY
  • Redefining a 'good day'

    The importance of rest for a child living with TK2d

    A day filled with rest, care and connection is not a lesser day; in the world of TK2d, it is a successful one, writes Aneesa Gracen.

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  • Honoring extraordinary work in TK2d

    TK2d expert wins MDA’s 2026 Legacy Award in Clinical Research

    Dr. Michio Hirano received the MDA 2026 Legacy Award for Achievement in Clinical Research.

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TK2d Basics

New to TK2d? Start here to find out about symptoms, diagnosis, treatment and more.

What is Thymidine Kinase 2 Deficiency (TK2d)?
TK2d basics