THO complex subunit 1 is a protein that in humans is encoded by the THOC1 gene.[5][6]
HPR1 is part of the TREX (transcription/export) complex, which includes TEX1 (MIM 606929), THO2 (MIM 300395), ALY (MIM 604171), and UAP56 (MIM 606390).[supplied by OMIM][6]
THOC1 has been shown to interact with Retinoblastoma protein.[7]