TBC1D3, a hominoid oncoprotein, is encoded by a cluster of paralogues located on chromosome 17q12

Genomics. 2006 Dec;88(6):731-736. doi: 10.1016/j.ygeno.2006.05.009. Epub 2006 Jul 24.


TBC1D3 is a member of the TBC1 domain family of proteins that stimulates the intrinsic GTPase activity of RAB5A, an essential actor in early endosome trafficking. Oncogenic properties of TBC1D3 have been demonstrated previously both in vitro and in mouse models. Although the oncogenic mechanism of TBC1D3 has yet to be elucidated, the TBC1D3 locus (chromosome 17q12) is amplified in 15% of primary prostate tumors. Here, we describe eight highly related TBC1D3 paralogues located within that genomic region, potentially encoding six variant TBC1D3 proteins. We found that human tissues display specific transcription patterns of these paralogues. Furthermore, that pattern was altered in several primary prostate tumors in comparison to healthy prostate tissues. Potential TBC1D3 oncogenic mechanisms are discussed in light of these results.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Chromosome Mapping
  • Chromosomes, Human, Pair 17 / genetics*
  • Female
  • GTPase-Activating Proteins / genetics*
  • GTPase-Activating Proteins / metabolism
  • Gene Dosage*
  • Genetic Variation*
  • Humans
  • Male
  • Oncogene Proteins / genetics*
  • Oncogene Proteins / metabolism
  • Oncogenes / genetics*
  • Organ Specificity
  • Placenta / metabolism
  • Prostate / metabolism
  • Prostatic Neoplasms / genetics
  • Proto-Oncogene Proteins
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism


  • GTPase-Activating Proteins
  • Oncogene Proteins
  • Proto-Oncogene Proteins
  • RNA, Messenger
  • TBC1D3 protein, human