Based on limited published evidence, TTC23L encodes a tetratricopeptide repeat domain protein involved in protein binding and endoplasmic reticulum (ER) stress response. A genome-wide association study identified TTC23L as associated with 3-aminoisobutyrate urinary metabolite levels (rs36071744, P = 2.97 × 10⁻¹⁰) 1. Related studies suggest tetratricopeptide repeat proteins, including potential orthologs, may regulate ER stress chaperones and cellular stress responses 2. Further functional characterization is needed to establish TTC23L's specific molecular mechanisms.