Hand, J. M., K. Zhang, L. Wang, Prasanthi P. Koganti, K. Mastrantoni, S. K. Rajput, M. Ashry, G. W. Smith, and J. Yao, "Discovery of a novel oocyte-specific Krüppel-associated box domain-containing zinc finger protein required for early embryogenesis in cattle.", Mechanisms of development, vol. 144, pp. 103-112, 2017 Mar 02. Abstract

Zinc finger (ZNF) transcription factors interact with DNA through zinc finger motifs and play important roles in a variety of cellular functions including cell growth, proliferation, development, apoptosis, and intracellular signal transduction. One-third of ZNF proteins in metazoans contain a highly conserved N-terminal motif known as the Krüppel-associated box (KRAB) domain, which acts as a potent, DNA-binding dependent transcriptional repression module. Analysis of RNA-Seq data generated from a bovine oocyte cDNA library identified a novel transcript, which encodes a KRAB-containing ZNF transcription factor (named ZNFO). Characterization of ZNFO mRNA expression revealed that it is exclusively expressed in bovine oocytes and early embryos. A GFP reporter assay demonstrated that ZNFO protein localizes specifically to the nucleus, supporting its role in transcriptional regulation. To test the role of ZNFO in early embryonic development, zygotes were generated by in vitro maturation and fertilization of oocytes, and injected with small interfering RNA (siRNA) designed to knockdown ZNFO. Cleavage rates were not affected by ZNFO siRNA injection. However, embryonic development to 8- to 16-cell stage and blastocyst stage was significantly reduced relative to the uninjected and negative control siRNA-injected embryos. Further, interaction of ZNFO with the highly conserved co-factor, KRAB-associated protein-1 (KAP1), was demonstrated, and evidence supporting transcriptional repression by ZNFO was demonstrated using a GAL4-luciferase reporter system. Results of described studies demonstrate that ZNFO is a maternally-derived oocyte-specific nuclear factor required for early embryonic development in cattle, presumably functioning by repressing transcription.

Ashry, M., S. K. Rajput, J. K. Folger, J. G. Knott, and G. W. Smith, "Potential Link Between Follistatin Mediated Increase in CDX2 Expression and a Loss of Epigenetic Modifications of CDX2 Regulatory Region in Early Bovine Embryos.", 49th Annual Meeting of Society for the Study of Reproduction, San Diego, California, USA, July, 16-20, 2016.
Ashry, M., Influence of Some Molecular Markers of Oocyte Competence on Regulation of Early Embryonic Development in Bovine, , Giza, Egypt, Cairo University, 2015. Abstract

Brilliant cresyl blue (BCB) is a super vital stain that has been used to select competent oocytes in different species. The objectives of the first part of the present studies were to determine mRNA abundance for select TGFβ superfamily components, SMAD2/3 and SMAD1/5 phosphorylation levels and transcript abundance for other oocyte (JY1) and cumulus cell (CTSB, CTSK, CTSS and CTSZ) markers of oocyte quality in bovine oocytes and or adjacent cumulus cells classified based on developmental potential using BCB staining. The ability of exogenous FST, JY1, or cathepsin inhibitor treatment to rescue development of embryos derived from poor quality oocytes selected based on BCB staining was also determined. Cumulus oocyte complexes (COCs) from abattoir derived ovaries were subjected to BCB staining and GV stage oocytes and cumulus cells harvested from control, BCB+ and BCB- (poor oocyte quality) groups for real time PCR or Western blot analysis. Remaining COCs underwent in vitro maturation, in vitro fertilization and embryo culture in presence or absence of above described treatments. Levels of FST, JY1, BMP15 and SMAD1, 2, 3 and 5 transcripts were higher in BCB+ oocytes whereas abundance of CTSB, CTSK, CTSS and CTSZ mRNAs was higher in cumulus cells surrounding poor quality BCB- oocytes. Western blot analysis revealed SMAD1/5 and SMAD2/3 phosphorylation were higher in BCB+ than BCB- oocytes. Embryo culture studies demonstrated that follistatin and cathepsin inhibitor treatment but not JY-1 treatment can rescue developmental competence of BCB- oocytes. Results provide further understanding of molecular indices of oocyte competence. The focus of the second part of the present studies was d to elucidate the regulatory role of protein kinase B “AKT” in oocytes and embryo competence and potential link to the embryotrophic actions of FST. The objectives of these studies were to determine the relationship between AKT transcript abundance/signaling activity and oocyte competence determined by BCB staining, and characterize the temporal changes in AKT mRNA during oocyte maturation and early embryogenesis in vitro. Effects of AKT inhibition on early embryonic progression and effects of follistatin supplementation on developmental capacity of AKT inhibitor treated embryos and signaling activity of AKT and its downstream targets were also analyzed. In vitro embryo production model was utilized to study the effect of AKT inhibition and FST supplementation on early embryos, qRT-PCR and Western blot were used for analysis of mRNA transcript abundance and signaling activity of investigated pathways respectively. Both AKT mRNA and phosphorylation level were higher in BCB+ than BCB- oocytes. Abundance of mRNA for AKT was increased in pronuclear through 8-cell stage embryos relative to GV stage oocytes, then decreased at 16-cell stage and further decreased in morula and blastocyst stage embryos. AKT inhibition during the initial 72 h of embryo culture blocks early cleavage, reduces total cleavage, 8-16 cell stage and blastocyst formation rate. FST supplementation partly rescues the effects of AKT inhibition but didn’t affect the phosphorylation level of AKT despite the significant increase in p-AKT at 1 and 10 h after FST supplementation. Results suggest a positive relationship between AKT transcript abundance/ signaling activity and oocyte competence determined by BCB staining. Results also demonstrate a temporal regulation of AKT mRNA abundance during early embryogenesis and indicate that embryotrophic actions of exogenous FST may be mediated, at least in part, by modulation of AKT signaling pathway. Further studies are required to elucidate the functional role of AKT and mechanism of action of FST in regulation of early embryonic development in bovine.

Ashry, M., Ultrasonographic pregnancy diagnosis in dogs, , Giza, Egypt, Cairo University, 2009. Abstract

Dogs have become an important household pet in Egypt beside their valuable part in the community, police and army forces and rescue organizations. The current study aimed at utilizing some important diagnostic techniques such as vaginal cytology and ultrasonography evaluation and improvement of canine reproduction.The current study was conducted on 45 out-patient bitches admitted to the Theriogenology Clinic from November 2008 to June 2009 for pregnancy diagnosis. These bitches were assigned into 2 groups, pregnant (28) and non pregnant (17). Based on vaginal cytology and ultrasonography, the non pregnant group bitches were evaluated and assigned into 7 bitches in anestrus,3 bitches in proestrus, 3 in estrus and 4 bitches in diestrus.Ultrasound examinations of pregnant group revealed that pregnancy was first detected 18 – 24 days post mating, 24 – 25 days from LH surge.Characterization of normal prenatal development was described and used to estimate fetal age. Fetal viability via heart beats was first assessed at 25 – 27days and via fetal movement at 34 – 36 days. Estimation of litter size was accurately done between 25 and 35 days. Parturition date was predicted and used to apply elective cesarean section with delivery of viable healthy puppies.In conclusion, we inferred that vaginal cytology is a simple, rapid and inexpensive test to confirm estrus and help an owner to determine the proper time to breed a bitch. Ultrasonography is a very valuable diagnostic tool to diagnose early pregnancy, estimate litter size, monitor fetal viability and predict parturition date; in addition, to differentiate between pregnancy and pyometra and other abnormalities.

Ashry, M., K. B. Lee, M. Mondal, T. Datta, J. K. Folger, S. K. Rajput, K. Zhang, N. A. Hemeida, and G. W. Smith, "Expression of TGF β superfamily components and other markers of oocyte quality in oocytes selected by brilliant cresyl blue staining: Relevance to early embryonic development", Molecular Reproduction and Development, vol. 82, issue 3, pp. 251-264, 2015.
Ashry, M., and G. W. Smith, "Application of embryo transfer using in vitro produced embryos: intrinsic factors affecting efficiency", Cattle practice, vol. 23, issue 1, pp. 1-8, 2015. abstract.pdf
Ashry, M., S. K. Rajput, J. K. Folger, J. G. Knott, N. A. Hemeida, O. M. T. Kandil, R. S. A. Ragab, and G. W. Smith, "Evidence support a potential role for the AKT signaling pathway in mediating embryotrophic actions of follistatin on bovine early embryonic development", 48th Annual Meeting of Society for the Study of Reproduction, San Juan, Puerto Rico, USA, June , 2015.
Ashry, M., S. K. Rajput, J. K. Folger, J. G. Knott, N. A. Hemeida, and G. W. Smith, "Regulation and potential regulatory role of AKT in bovine oocyte competence", 47th Annual Meeting - Society for the Study of Reproduction , Grand Rapids, Michigan, USA, 21 July, 2014. ssr_poster_2014.pdf
Smith, G. W., K. Zhang, K. B. Lee, J. K. Folger, S. Rajput, M. Ashry, and J. G. Knott, "Embryotropic actions of follistatin: Mechanisms and translational relevance", 47th Annual Meeting - Society for the Study of Reproduction, Grand Rapids, Michigan, USA, 21 July, 2014. ssr_abstract.pdf