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G. Ptak · SciRah

Researcher profile · Semantic Scholar

G. Ptak

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G. Ptak — researcher profile on SciRah

h-index: 29
Works: 103
Citations: 2,680

Most-cited papers

The effect of interspecific oocytes on demethylation of sperm DNA.
N. Beaujean, J. E. Taylor, Michelle McGarry, J. Gardner +8 more
2004Proceedings of the National Academy of Sciences of the United States of America128 citations Open access
Semantic Scholar
Embryonic Diapause Is Conserved across Mammals
G. Ptak, E. Tacconi, M. Czernik, P. Toschi +2 more
2012PLoS ONE122 citations Open access
Semantic Scholar
Conservation of IGF2-H19 and IGF2R imprinting in sheep: effects of somatic cell nuclear transfer.
L. Young, A. Schnieke, K. McCreath, Sébastien Wieckowski +7 more
2003Mechanisms of Development122 citations Open access
Semantic Scholar
Freeze-Dried Somatic Cells Direct Embryonic Development after Nuclear Transfer
P. Loi, K. Matsukawa, G. Ptak, M. Clinton +3 more
2008PLoS ONE100 citations Open access
Semantic Scholar
Placental abnormalities associated with post-natal mortality in sheep somatic cell clones.
P. Loi, M. Clinton, I. Vackova, J. Fulka +4 more
2006Theriogenology97 citations
Semantic Scholar
Preservation of the Wild European Mouflon: The First Example of Genetic Management Using a Complete Program of Reproductive Biotechnologies
G. Ptak, M. Clinton, B. Barboni, M. Muzzeddu +3 more
2002Biology of Reproduction89 citations
Semantic Scholar
Interspecies somatic cell nuclear transfer: a salvage tool seeking first aid.
P. Loi, J. Modliński, G. Ptak
2011Theriogenology85 citations
Semantic Scholar
Review Paper: A Review of the Pathology of Abnormal Placentae of Somatic Cell Nuclear Transfer Clone Pregnancies in Cattle, Sheep, and Mice
Chiara Palmieri, P. Loi, G. Ptak, L. Della Salda
2008Veterinary Pathology-Supplement75 citations Open access
Semantic Scholar
Lipid droplets in mammalian eggs are utilized during embryonic diapause
R. Arena, S. Bisogno, Ł. Gąsior, J. Rudnicka +13 more
2021Proceedings of the National Academy of Sciences of the United States of America72 citations Open access
Semantic Scholar
Nucleus transfer in mammals: noninvasive approaches for the preparation of cytoplasts.
J. Fulka, P. Loi, H. Fulka, G. Ptak +1 more
2004Trends in Biotechnology51 citations
Semantic Scholar
Towards storage of cells and gametes in dry form.
Pasqualino Loi, D. Iuso, M. Czernik, F. Zacchini +1 more
2013Trends in Biotechnology50 citations
Semantic Scholar
The effects of assisted reproduction technologies on metabolic health and disease
M. F. Heber, G. Ptak
2020Biology of Reproduction49 citations Open access
Semantic Scholar
Leukaemia inhibitory factor enhances sheep fertilization in vitro via an influence on the oocyte.
G. Ptak, F. Lopes, K. Matsukawa, M. Tischner +1 more
2006Theriogenology49 citations
Semantic Scholar
Improving Delivery and Offspring Viability of In Vitro-Produced and Cloned Sheep Embryos1
G. Ptak, M. Clinton, M. Tischner, B. Barboni +2 more
2002Biology of Reproduction46 citations Open access
Semantic Scholar
Developmental and functional evidence of nuclear immaturity in prepubertal oocytes.
G. Ptak, K. Matsukawa, C. Palmieri, L. Della Salda +2 more
2006Human Reproduction44 citations
Semantic Scholar
Exogenous Expression of Human Protamine 1 (hPrm1) Remodels Fibroblast Nuclei into Spermatid-like Structures
D. Iuso, M. Czernik, P. Toschi, A. Fidanza +8 more
2015Cell Reports40 citations Open access
Semantic Scholar
Increasing methylation of sperm rDNA and other repetitive elements in the aging male mammalian germline
R. Potabattula, F. Zacchini, G. Ptak, M. Dittrich +9 more
2020Aging Cell39 citations Open access
Semantic Scholar
Donor-Dependent Developmental Competence of Oocytes from Lambs Subjected to Repeated Hormonal Stimulation1
G. Ptak, M. Tischner, N. Bernabò, P. Loi
2003Biology of Reproduction38 citations Open access
Semantic Scholar
Effects of blastomere biopsy on post-natal growth and behavior in mice.
S. Sampino, F. Zacchini, A. Świergiel, A. Modlinski +2 more
2014Human Reproduction37 citations Open access
Semantic Scholar
Post-implantation mortality of in vitro produced embryos is associated with DNA methyltransferase 1 dysfunction in sheep placenta.
G. Ptak, A. d'Agostino, P. Toschi, A. Fidanza +4 more
2013Human Reproduction35 citations Open access
Semantic Scholar
Cloning of endangered mammalian species: any progress?
P. Loi, C. Galli, G. Ptak
2007Trends in Biotechnology35 citations
Semantic Scholar
Embryo biopsy and development: the known and the unknown.
F. Zacchini, R. Arena, Adam Abramik, G. Ptak
2017Reproduction34 citations Open access
Semantic Scholar
Nuclear transfer of freeze-dried somatic cells into enucleated sheep oocytes.
P. Loi, K. Matzukawa, G. Ptak, Y. Natan +2 more
2008Reproduction in domestic animals = Zuchthygiene34 citations
Semantic Scholar
Placental abnormalities in ovine somatic cell clones at term: a light and electron microscopic investigation.
C. Palmieri, P. Loi, L. P. Reynolds, G. Ptak +1 more
2007Placenta31 citations
Semantic Scholar
A short exposure to polychlorinated biphenyls deregulates cellular autophagy in mammalian blastocyst in vitro.
G. Ptak, F. Zacchini, M. Czernik, A. Fidanza +4 more
2012Human Reproduction30 citations Open access
Semantic Scholar
Pregnancy at Advanced Maternal Age Affects Behavior and Hippocampal Gene Expression in Mouse Offspring
S. Sampino, A. Stankiewicz, F. Zacchini, J. Gościk +5 more
2017The journals of gerontology. Series A, Biological sciences and medical sciences29 citations Open access
Semantic Scholar
Asymmetric nuclear reprogramming in somatic cell nuclear transfer?
P. Loi, N. Beaujean, S. Khochbin, J. Fulka +1 more
2008Bioessays29 citations Open access
Semantic Scholar
Embryonic diapause in humans: time to consider?
G. Ptak, J. Modliński, P. Loi
2013Reproductive Biology and Endocrinology27 citations Open access
Semantic Scholar
Plasma membrane and acrosome loss before ICSI is required for sheep embryonic development
D. Anzalone, D. Iuso, M. Czernik, G. Ptak +1 more
2016Journal of Assisted Reproduction and Genetics26 citations Open access
Semantic Scholar
Genomic Stability of Lyophilized Sheep Somatic Cells before and after Nuclear Transfer
D. Iuso, M. Czernik, F. di Egidio, S. Sampino +6 more
2013PLoS ONE26 citations Open access
Semantic Scholar
Oocyte Maturation and Fertilization: A long history for a short event
E. Tosti, R. Boni, S. Bilotto, Tiziana Al Brevini +20 more
201224 citations Open access
Semantic Scholar
A Simplified Approach for Oocyte Enucleation in Mammalian Cloning
D. Iuso, M. Czernik, F. Zacchini, G. Ptak +1 more
2013Cellular Reprogramming22 citations Open access
Semantic Scholar
High levels of anandamide, an endogenous cannabinoid, block the growth of sheep preimplantation embryos by inducing apoptosis and reversible arrest of cell proliferation.
M. Turco, K. Matsukawa, M. Czernik, V. Gasperi +6 more
2008Human Reproduction22 citations Open access
Semantic Scholar
DNA damage in preimplantation embryos and gametes: specification, clinical relevance and repair strategies
R. Musson, Ł. Gąsior, S. Bisogno, G. Ptak
2022Human Reproduction Update19 citations Open access
Semantic Scholar
Ribosomal DNA methylation in human and mouse oocytes increases with age
R. Potabattula, T. Trapphoff, M. Dittrich, K. Fic +3 more
2022Aging19 citations Open access
Semantic Scholar
Impaired Placental Vasculogenesis Compromises the Growth of Sheep Embryos Developed In Vitro1
A. Fidanza, P. Toschi, F. Zacchini, M. Czernik +5 more
2014Biology of Reproduction18 citations Open access
Semantic Scholar
Differentiation potential and GFP labeling of sheep bone marrow‐derived mesenchymal stem cells
M. Czernik, A. Fidanza, Martina Sardi, C. Galli +6 more
2013Journal of Cellular Biochemistry17 citations Open access
Semantic Scholar
Synergies between assisted reproduction technologies and functional genomics
P. Loi, P. Toschi, F. Zacchini, G. Ptak +5 more
2016Genetics Selection Evolution16 citations Open access
Semantic Scholar
Hope for the Mammoth?
J. Fulka, P. Loi, G. Ptak, H. Fulka +1 more
2009Cloning and Stem Cells16 citations
Semantic Scholar
Mouse single oocyte imaging by MALDI-TOF MS for lipidomics
A. Bodzon-Kulakowska, R. Arena, Przemysław Mielczarek, Kinga Hartman +7 more
2020Cytotechnology (Dordrecht)15 citations Open access
Semantic Scholar
Cobalamin supplementation during in vitro maturation improves developmental competence of sheep oocytes.
F. Zacchini, P. Toschi, G. Ptak
2017Theriogenology15 citations Open access
Semantic Scholar
Biological time machines: a realistic approach for cloning an extinct mammal
P. Loi, T. Wakayama, Joseph Saragustry, J. Fulka +1 more
201115 citations Open access
Semantic Scholar
Sheep (Ovis aries) Macrophage Migration Inhibitory Factor: molecular cloning, characterization, tissue distribution and expression in the ewe reproductive tract and in the placenta.
F. Lopes, Alessandro Vannoni, S. Sestini, A. Casciaro +6 more
2011Cytokine14 citations
Semantic Scholar
Polychlorinated biphenyls (PCBs) alter DNA methylation and genomic integrity of sheep fetal cells in a simplified in vitro model of pregnancy exposure.
D. Anzalone, S. Sampino, M. Czernik, D. Iuso +1 more
2018Toxicology in Vitro13 citations Open access
Semantic Scholar
Species-Specific Paternal Age Effects and Sperm Methylation Levels of Developmentally Important Genes
A. Prell, Mustafa Orkun Sen, R. Potabattula, Laura Bernhardt +7 more
2022Cells12 citations Open access
Semantic Scholar
Assessing the epigenetic risks of assisted reproductive technologies: a way forward.
F. Zacchini, S. Sampino, A. Stankiewicz, T. Haaf +1 more
2019International Journal of Developmental Biology12 citations Open access
Semantic Scholar
Evidence of Placental Autophagy during Early Pregnancy after Transfer of In Vitro Produced (IVP) Sheep Embryos
P. Toschi, M. Czernik, F. Zacchini, A. Fidanza +2 more
2016PLoS ONE12 citations Open access
Semantic Scholar
Efficient Production and Cellular Characterization of Sheep Androgenetic Embryos
F. Zacchini, M. Czernik, D. Iuso, P. Toschi +4 more
2011Cellular Reprogramming12 citations Open access
Semantic Scholar
Development of Sheep Androgenetic Embryos Is Boosted following Transfer of Male Pronuclei into Androgenetic Hemizygotes
K. Matsukawa, M. Turco, P. Scapolo, L. Reynolds +2 more
2007Cloning and Stem Cells10 citations
Semantic Scholar
Deregulated Expression of Mitochondrial Proteins Mfn2 and Bcnl3L in Placentae from Sheep Somatic Cell Nuclear Transfer (SCNT) Conceptuses
M. Czernik, P. Toschi, F. Zacchini, D. Iuso +1 more
2017PLoS ONE9 citations Open access
Semantic Scholar

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P. Loi×33
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