The THO complex plays a role in coupling transcription elongation to mRNA export. It is composed of subunits THP2, HPR1, THO2 and MFT1 [1]. The THO complex is a nuclear complex that is required for transcription elongation through genes containing tandemly repeated DNA sequences. The THO complex is also part of the TREX (TRanscription EXport) complex that is involved in coupling transcription to export of mRNAs to the cytoplasm [2,3].

1: Human hHpr1/p84/Thoc1 regulates transcriptional elongation and physically links RNA polymerase II and RNA processing factors. Li Y, Wang X, Zhang X, Goodrich DW; Mol Cell Biol. 2005;25:4023-4033. PMID:15870275

2: A protein complex containing Tho2, Hpr1, Mft1 and a novel protein, Thp2, connects transcription elongation with mitotic recombination in Saccharomyces cerevisiae. Chavez S, Beilharz T, Rondon AG, Erdjument-Bromage H, Tempst P, Svejstrup JQ, Lithgow T, Aguilera A; EMBO J. 2000;19:5824-5834. PMID:11060033

3: The yeast THO complex and mRNA export factors link RNA metabolism with transcription and genome instability. Jimeno S, Rondon AG, Luna R, Aguilera A; EMBO J. 2002;21:3526-3535. PMID:12093753