Ahmed Mamoon Abd El Tawab

Scopus Publications

Gender-specific responses in gene expression of Nile tilapia (Oreochromis niloticus) to heavy metal pollution in different aquatic habitats
Simone T. Awad, Shabaan A. Hemeda, Abeer F. El Nahas, Eman M. Abbas, Mohamed A. S. Abdel-Razek, Mohamed Ismail, Ahmed Mamoon, and Fawzia S. Ali
Springer Science and Business Media LLC
AbstractMonitoring heavy metal accumulation is essential for assessing the viability of aquatic ecosystems. Our methodology involved integrating analysis of immunological, stress, inflammatory, and growth-related gene expression in male and female Nile tilapia with on-site recordings of physicochemical parameters. Additionally, we assessed the effect of different physicochemical parameters on heavy metal bioavailability and residual concentration in fish and water. Samples of fish and water were gathered from three different localities: Lake Brullus, a brackish lake sited in northern Egypt; Lake Nasser, an artificial freshwater reservoir located in southern Egypt; and El-Qanater El-Khayria, a middle-freshwater location belonging to the Rashid branch of the river Nile. The assessment of heavy metal residues (Fe, Cu, Zn, Mn, and Ni) revealed that their concentrations were higher in fish specimens compared to their counterparts in water (except for Ni). In addition, Lake Brullus emerges as the most polluted area, exhibiting elevated levels of heavy metals concentrations in water and fish specimens. In contrast, Lake Nasser showed the least degree of heavy metals pollution. Gene expression analysis revealed gender-specific responses to heavy metal exposure at the three investigated water bodies. The expression of hepatic antioxidant genes (GST and MT) and inflammatory-related genes (CC-chemokine and TNFα) increased in males compared to females. In females, the immune and pro-inflammatory-related genes (IgM and CXC2-chemokine) transcripts were upregulated. Additionally, growth-related genes were downregulated in both Lake Brullus and El-Qanater; on the contrary, fish samples from Lake Nasser exhibited a normal expression pattern of growth-related genes. Stress-related genes (HSP70 and HSP27) showed significant downregulation in gills of both genders from Lake Brullus. The minimal presence of heavy metal contaminants in Lake Nasser seems to endorse the normal patterns of gene expression across all gene categories. A potential gender-specific gene expression response towards pollution was noticed in genes associated with inflammation and antioxidant activities. This highlights the importance of considering gender-related responses in future environmental assessments.


Investigating Nuclear DNA Microsatellites in the Nile Tilapia (Oreochromis niloticus): Insights into Association Genetics
Ahmed Mamoon et al.
Egyptian Knowledge Bank
One of the key challenges in aquaculture is the selection of individuals with superior traits, including rapid growth rate, high flesh quality, and disease resistance. Marker-assisted selection (MAS) using molecular markers (e


Genetic Diversity Assessment and Association Analysis of Body Characters of the Nile tilapia (Oreochromis niloticus) using AFLP
Fawzia S. Ali et al.
Egyptian Knowledge Bank



The green microalga Scenedesmus quadricauda modulates the performance, immune indices, and disease resistance of Nile tilapia fingerlings
Mohsen Abdel-Tawwab, Ahmed G.A. Gewida, Mohamed F. Abdelghany, Mamdouh A.A. Mousa, Nashwa Abdel-Razek, Eman A.A. Abdel-Hamid, Sherien H.H. Shady, and Ahmed Mamoon
Elsevier BV



Dietary Chlorella vulgaris modulates the performance, antioxidant capacity, innate immunity, and disease resistance capability of Nile tilapia fingerlings fed on plant-based diets
Mohsen Abdel-Tawwab, Mamdouh A.A. Mousa, Ahmed Mamoon, Mohamed F. Abdelghany, Eman A.A. Abdel-Hamid, Nashwa Abdel-Razek, Fawzia S. Ali, Sherien H.H. Shady, and Ahmed G.A. Gewida
Elsevier BV



Impact of aqueous exposure to silver nanoparticles on growth performance, redox status, non-specific immunity, and histopathological changes of Nile Tilapia, Oreochromis niloticus, challenged with Aeromonas hydrophila
Mohamed M. Mabrouk, Abdallah Tageldein Mansour, Ahmed F. Abdelhamid, Khamael M. Abualnaja, Ahmed Mamoon, Walaa S. Gado, Aya F. Matter, and Hala F. Ayoub
Elsevier BV



The enhancement of the growth rate, intestinal health, expression of immune-related genes, and resistance against suboptimal water temperature in common carp (Cyprinus carpio) by dietary paraprobiotics
Taha Yassine, Malik Mohamed Khalafalla, Mohamed Mamdouh, Zizy I. Elbialy, Abdallah S. Salah, Aly Ahmedou, Ahmed Mamoon, Ahmed M. El-Shehawi, Hien Van Doan, and Mahmoud A.O. Dawood
Elsevier BV



Some reproductive aspects of the indian squid loligo duvauceli in the gulf of suez, egypt.
Ahmed G.A. Gewida et al.
Egypts Presidential Specialized Council for Education and Scientific Research



Mitochondrial-based phylogenetic inference of worldwide species of genus siganus
Fawzia S. Ali, Ahmed Mamoon, and Eman Abbas
Egypts Presidential Specialized Council for Education and Scientific Research



DNA Barcoding for Identification of Some Fish Species (Sparidae) in Mediterranean Sea Area
Shaimaa Eissa, Yosur Gamal Fiteha, Hagar Tarek Elhifnawy, Mahmoud Magdy, Ahmed Mamoon, Nadia Hussien, and Mohamed Abdel-Salam Rashed
Egypts Presidential Specialized Council for Education and Scientific Research
Background: DNA barcoding depend on a piece of the cytochrome C oxidase subunit I (COI) gene in the mitochondrial genome is broadly useful in species ID and biodiversity studies. The aim of this study is to create a complete barcoding reference database of some fishes in the Mediterranean Sea fall under the family Sparidae. . Materials and methods: Mitochondrial COI barcode sequences were demonstrated from 8 species of family Sparidae in the order Perciformes, the mean length of Mitochondrial COI sequences was 650 base pairs. Results: The results of the phylogenetic tree presented that monophyly of Sparidae species. The studied species displayed clades of conspecific sequences and showed a match between the present study and the GenBank (NCBI) database. All groups clustered with high bootstrap value, that showed next to each branch and the tree was rooted based on the out group of Rhincodon typus. Conclusion: We achieve that COI sequencing can be used to recognize different fish species, and also it is used to obtain high competence of species reorganization by DNA barcoding. We underline the power of DNA barcode and its tools to identify different species from Mediterranean Sea. Results give Species ID for each species under study by using DNA barcoding.


Population genetic studies of genus Dicentrarchus reveal loss of genetic diversity in Egyptian waters
Fawzia S. Ali and Ahmed Mamoon
Elsevier BV



Comparative molecular identification of genus dicentrarchus using mitochondrial genes and internal transcribed spacer region
Fawzia S. Ali, Mohamed Ismail, and Ahmed Mamoon
Egypts Presidential Specialized Council for Education and Scientific Research