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Home / Archives for Marques CC

Prion protein 2 (dublet) gene (PRND): role in ovine semen capacitation, cryopreservation and fertility

  • Autores: Baptista MC, Barbas JP, Domingos A, Ferreira LM, Garcia-Herreros M, Horta AEM, Marques CC, Mesquita P, Pereira RMLN, Pimenta J, Prates JAM
  • Ano de Publicação: 2016
  • Journal: Reproduction Fertility and Development
  • Link: http://www.publish.csiro.au/rd/RD15214

The aim of the present study was to examine the role of Doppel protein in the capacitation process and fertilising ability of both fresh and frozen-thawed (FT) spermatozoa from rams carrying different prion protein 2 (dublet) (PRND) gene polymorphisms. The detection efficacy of new anti-Doppel monoclonal antibodies and PRND mRNA quantification were also explored in […]
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Inhibition of ovine in vitro fertilization by anti-Prt antibody: Hypothetical model for Prt/ZP interaction

  • Autores: Baptista MC, Barbas JP, Cabrita E, Domingos A, Fontes CA, Horta EMA, Marques CC, Martins IC, Mesquita P, Pereira MLNR, Pessa P, Pimenta J, Prates AMJ, Sardinha J, Soares R, Viegas A
  • Journal: Reproductive Biology and Endocrinology
  • Link: http://www.rbej.com/content/11/1/25

The impact of prion proteins in the rules that dictate biological reproduction is still poorly understood. Likewise, the role of prnt gene, encoding the prion-like protein testis specific (Prt), in ram reproductive physiology remains largely unknown. In this study, we assessed the effect of Prt in ovine fertilization by using an anti-Prt antibody (APPA) in fertilization medium incubated with spermatozoa and oocytes. Moreover, a computational model was constructed to infer how the results obtained could be related to a hypothetical role for Prt in sperm-zona pellucida (ZP) binding.
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Is prnt a pseudogene? Identification of ram Prt in testis and ejaculated spermatozoa.

  • Autores: Baptista MC, Barbas JP, Cantante C, Fontes CA, Gonçalves J, Horta AE, Marques CC, Mesquita P, Pereira RM, Pimenta J, Prates JA, Santos A, Santos P, Viegas A
  • Journal: PLoS One
  • Link: http://www.ncbi.nlm.nih.gov/pubmed/?term=Is+prnt+a+Pseudogene%3F+Identification+of+Ram+Prt+in+Testis+and+Ejaculated+Spermatozoa.

A hallmark of prion diseases or transmissible spongiform encephalopaties is the conversion of the cellular prion protein (PrP(C)), expressed by the prion gene (prnp), into an abnormally folded isoform (PrP(Sc)) with amyloid-like features that causes scrapie in sheep among other diseases. prnp together with prnd (which encodes a prion-like protein designated as Doppel), and prnt (that encodes the prion protein testis specific–Prt) with sprn (shadow of prion protein gene, that encodes Shadoo or Sho) genes, constitute the “prion gene complex”.
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About GHTM

GHTM is a R&D Center that brings together researchers from IHMT with a track record in Tropical Medicine and International/Global Health. It aims at strengthening Portugal's role as a leading partner in the development and implementation of a global health research agenda. Our evidence-based interventions contribute to the promotion of equity in health and to improve the health of populations.

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