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Animal Breeding and Genetics
Asian-Australasian Journal of Animal Sciences 2005;18(12): 1684-1690.
https://doi.org/10.5713/ajas.2005.1684    Published online December 2, 2005.
Cloning and Characterization of Liver cDNAs That Are Differentially Expressed between Chicken Hybrids and Their Parents
Sun Dong-Xiao, Wang Dong, Yu Ying, Zhang Yuan
Using mRNA differential display technique, we investigated differential gene expression in hybrids relative to their parents in a diallel cross involving four chicken breeds in order to provide an insight into the molecular basis of heterosis in chicken. The results indicated that there was extensive differential gene expression between chicken F1 hybrids and their parents which was classified into four kinds of patterns as following: (1) bands only detected in hybrid F1; (2) bands only absent in hybrid F1; (3) bands only detected in parent P1 or P2; (4) bands absent in parent P1 or P2. Forty-two differentially expressed cDNAs were cloned and sequenced, and their expression patterns were confirmed by Reverse-Northern dot blot. Sequence analysis and database searches revealed that genes showed differential expression between hybrid and parents were regulatory and functional genes involved in metabolism, mRNA splicing, transcriptional regulation, cell cycles and protein modification. These results indicated that hybridization between two parents can cause changes in expression of a variety of genes. In conclusion, that the altered pattern of gene expression in hybrids may be responsible for heterosis in chickens.
Keywords: mRNA Differential Display; Differential Gene Expression; Heterosis; Chicken

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