TAILIEUCHUNG - Báo cáo sinh học: "Combining two Meishan F2 crosses improves the detection of QTL on pig chromosomes 2, 4 and 6"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học quốc tế đề tài: Combining two Meishan F2 crosses improves the detection of QTL on pig chromosomes 2, 4 and 6 | Tortereau et al. Genetics Selection Evolution 2010 42 42 http content 42 1 42 GSE Ge n et i cs Selection Evolution RESEARCH Open Access Combining two Meishan F2 crosses improves the detection of QTL on pig chromosomes 2 4 and 6 2 3 2 3 Flavie Tortereau Hélène Gilbert Henri CM Heuven Jean-Pierre Bidanel Martien AM Groenen Juliette Riquet1 Abstract Background In pig a number of experiments have been set up to identify QTL and a multitude of chromosomal regions harbouring genes influencing traits of interest have been identified. However the mapping resolution remains limited in most cases and the detected QTL are rather inaccurately located. Mapping accuracy can be improved by increasing the number of phenotyped and genotyped individuals and or the number of informative markers. An alternative approach to overcome the limited power of individual studies is to combine data from two or more independent designs. Methods In the present study we report a combined analysis of two independent design a French and a Dutch F2 experimental designs with 2000 F2 individuals. The purpose was to further map QTL for growth and fatness on pig chromosomes 2 4 and 6. Using QTL-map software uni- and multiple-QTL detection analyses were applied separately on the two pedigrees and then on the combination of the two pedigrees. Results Joint analyses of the combined pedigree provided 1 greater significance of shared QTL 2 exclusion of false suggestive QTL and 3 greater mapping precision for shared QTL. Conclusions Combining two Meishan x European breeds F2 pedigrees improved the mapping of QTL compared to analysing pedigrees separately. Our work was facilitated by the access to raw phenotypic data and DNA of animals from both pedigrees and the combination of the two designs with the addition of new markers allowed us to fine map QTL without phenotyping additional animals. Background Over the past fifteen years the construction of genetic maps in livestock species has

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