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Gene Review

ZBTB18  -  zinc finger and BTB domain containing 18

Homo sapiens

Synonyms: 58 kDa repressor protein, C2H2-171, MRD22, RP58, TAZ-1, ...
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Disease relevance of ZNF238

  • The purpose of this study was to design specific PCR primers for five phylotypes AP12, AP21, AP24, AP50, and RP58, which are deeply branched particularly in the phylogenetic tree, and determine the prevalence of these phylotypes in 45 patients with periodontitis and 18 healthy subjects [1].

High impact information on ZNF238

  • In the absence of Taz1, telomere clustering at the spindle pole bodies is disrupted, meiotic recombination is reduced, and both spore viability and the ability of zygotes to re-enter mitosis are impaired to a level that would be expected if chromosome segregation were occurring randomly [2].
  • Taz1p is required for the repression of telomere-adjacent gene expression and for normal meiosis or sporulation [3].
  • This protein, termed Ccq1p (coiled-coil protein quantitatively enriched), localizes with Taz1p to telomeres in normal vegetative cells [4].
  • Rap1 acts in a Taz1-dependent pathway to prevent chromosome end fusions and regulate telomeric 3' overhang formation, while Rif1 is dispensable for these functions [5].
  • Silencing of the tapetum-specific zinc finger gene TAZ1 causes premature degeneration of tapetum and pollen abortion in petunia [6].

Biological context of ZNF238

  • Such upregulated genes included those involved in nuclear structure and meiosis (SYCP2), DNA repair (RFC5), and transcription regulation (ZNF238) [7].
  • We suggest that RP58 may be involved in a molecular link between sequence-specific transcriptional repression and the organization of chromosomes in the nucleus [8].
  • RT-PCR analysis also demonstrated the existence of an alternatively spliced form of rp58 similar to the previously reported zinc-finger cDNA, C2H2-171 [9].
  • The gene encoding C2H2-171 is highly conserved in vertebrates, and maps to the terminus of human chromosome 1 (1q44-ter) [10].
  • Here, we report a functional characterization that includes analysis of spatial and temporal expression profiles and examination of anther phenotypes in TAZ1-silenced plants [6].

Anatomical context of ZNF238

  • RP58, a sequence-specific transcriptional repressor sharing homology with the POZ domain of a number of zinc-finger proteins, is highly synthesized in brain and localized in condensed chromatin regions, suggesting a role in transcriptional repression in the central nervous system [9].
  • C2H2-171 RNA was expressed at high levels in primary cerebellar granule cell neurons compared to astrocytes [10].
  • Using a cell-free system containing Taz1-enriched membrane fractions, we have examined the phosphorylation properties of Taz1 and the stimulatory effects of divalent and monovalent ions [11].

Associations of ZNF238 with chemical compounds

  • Unlike Taz1 (a similar hybrid with the Tar linker), Tez1 could not respond to Tar ligand, aspartate, whereas single Ala insertion at the transmembrane/linker junction, as seen in Tez1A1, restored the aspartate-regulatable phenotype [12].
  • Highest activation of Taz1 phosphorylation was observed with CaCl2, and its stimulation could be observed with as low as 60 microM of CaCl2 [11].

Physical interactions of ZNF238


Other interactions of ZNF238

  • At the N-terminus, C2H2-171 contains a POZ/tramtrack-like domain similar to that found in the tumor associated zinc finger proteins LAZ-3/BCL-6 and PLZ-F, as well as in non-zinc finger proteins [10].
  • The Myb-like domain of RTBP1 is very closely related to that of other telomere-binding proteins, including TRF1, TRF2, Taz1p, and Tbf1p, indicating that DNA-binding domains of telomere-binding proteins are well conserved among evolutionarily distant species [14].
  • This suggests that Taz1p and TRF2 share common features in telomere regulation [13].
  • Taz1p and Teb1p, two telobox proteins in Schizosaccharomyces pombe, recognize different telomere-related DNA sequences [15].

Analytical, diagnostic and therapeutic context of ZNF238


  1. Detection of novel oral phylotypes associated with periodontitis. Sakamoto, M., Huang, Y., Umeda, M., Ishikawa, I., Benno, Y. FEMS Microbiol. Lett. (2002) [Pubmed]
  2. Fission yeast Taz1 protein is required for meiotic telomere clustering and recombination. Cooper, J.P., Watanabe, Y., Nurse, P. Nature (1998) [Pubmed]
  3. Regulation of telomere length and function by a Myb-domain protein in fission yeast. Cooper, J.P., Nimmo, E.R., Allshire, R.C., Cech, T.R. Nature (1997) [Pubmed]
  4. An SMC-domain protein in fission yeast links telomeres to the meiotic centrosome. Flory, M.R., Carson, A.R., Muller, E.G., Aebersold, R. Mol. Cell (2004) [Pubmed]
  5. Taz1, Rap1 and Rif1 act both interdependently and independently to maintain telomeres. Miller, K.M., Ferreira, M.G., Cooper, J.P. EMBO J. (2005) [Pubmed]
  6. Silencing of the tapetum-specific zinc finger gene TAZ1 causes premature degeneration of tapetum and pollen abortion in petunia. Kapoor, S., Kobayashi, A., Takatsuji, H. Plant Cell (2002) [Pubmed]
  7. Identification of differentially expressed genes in HPV-positive and HPV-negative oropharyngeal squamous cell carcinomas. Martinez, I., Wang, J., Hobson, K.F., Ferris, R.L., Khan, S.A. Eur. J. Cancer (2007) [Pubmed]
  8. RP58 associates with condensed chromatin and mediates a sequence-specific transcriptional repression. Aoki, K., Meng, G., Suzuki, K., Takashi, T., Kameoka, Y., Nakahara, K., Ishida, R., Kasai, M. J. Biol. Chem. (1998) [Pubmed]
  9. Structural analysis of the gene encoding RP58, a sequence-specific transrepressor associated with heterochromatin. Meng, G., Inazawa, J., Ishida, R., Tokura, K., Nakahara, K., Aoki, K., Kasai, M. Gene (2000) [Pubmed]
  10. C2H2-171: a novel human cDNA representing a developmentally regulated POZ domain/zinc finger protein preferentially expressed in brain. Becker, K.G., Lee, I.J., Nagle, J.W., Canning, R.D., Gado, A.M., Torres, R., Polymeropoulos, M.H., Massa, P.T., Biddison, W.E., Drew, P.D. Int. J. Dev. Neurosci. (1997) [Pubmed]
  11. Ca2(+)-enhanced phosphorylation of a chimeric protein kinase involved with bacterial signal transduction. Rampersaud, A., Utsumi, R., Delgado, J., Forst, S.A., Inouye, M. J. Biol. Chem. (1991) [Pubmed]
  12. Analysis of the role of the EnvZ linker region in signal transduction using a chimeric Tar/EnvZ receptor protein, Tez1. Zhu, Y., Inouye, M. J. Biol. Chem. (2003) [Pubmed]
  13. Fission yeast Rap1 homolog is a telomere-specific silencing factor and interacts with Taz1p. Park, M.J., Jang, Y.K., Choi, E.S., Kim, H.S., Park, S.D. Mol. Cells (2002) [Pubmed]
  14. Sequence-specific DNA recognition by the Myb-like domain of plant telomeric protein RTBP1. Yu, E.Y., Kim, S.E., Kim, J.H., Ko, J.H., Cho, M.H., Chung, I.K. J. Biol. Chem. (2000) [Pubmed]
  15. Taz1p and Teb1p, two telobox proteins in Schizosaccharomyces pombe, recognize different telomere-related DNA sequences. Vassetzky, N.S., Gaden, F., Brun, C., Gasser, S.M., Gilson, E. Nucleic Acids Res. (1999) [Pubmed]
  16. Semi-conservative DNA replication through telomeres requires Taz1. Miller, K.M., Rog, O., Cooper, J.P. Nature (2006) [Pubmed]
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