ABSTRACT
Insulin-like growth factor II [IGF-II] is a crucial factor in regulating cell proliferation, growth, migratioi differentiation and survival. The objective of this study was to investigate the association of polymorphisi in intron 3 and exon 3 of insulin like growth factor II [IGF-Il] gene and body weight trait in tilapia nilotic fish using restriction fragment length polymorphism [RFLP] and single nucleotide polymorphism [SN1 techniques. Thirty tilapia nilotica fish were precisely selected according to their body weight and ordere from the largest to the smallest body size. DNA was extracted from fish blood samples to amplify 397-bp of IGF-II gene. Amplified IGF-II gene was sequenced only in the seven large and five small size fish. Resul revealed that restriction analysis [RFLP] with MSP of the [IGF-II] gene [397-bp] do not produ restriction fragments. While, DNA sequencing showed fourteen single nucleotide polymorphisms [SNP' at different positions in large size fish as they were detected in more than one fish at nucleotides numb* 318 [C-"T], 319 [A->T], 320 [G-"A in three fish], 322 [C-"A and C-"G], 323 [G->C and G-"A], 32 [G-"A in three fish], 332 [A-"T in three fish], 333 [C-"A and C-"T], 334 [A-"C in two fish], 337 [C-" in two fish] and 340 [C-"T]. Hence, our results reveal the possibility to use these findings as marker for selection of high body weight trait in tilapia nilotica fish