Genetic diversity in goat breeds based on microsatellite analysis / 生物工程学报

Fluorescence PCR was applied to investigate the genetic diversities of 9 indigenous Chinese goat breeds and 1 exotic breed with 10 microsatellite DNA markers recommended by the Food and Agriculture Organization of the United Nations and the International Livestock Research Institute of Animal Genetics, which provide data for the preservation and utilization of indigenous goat breeds genetic resource. We found that the 7 breeds were high polymorphic while 3 breeds were moderate polymorphic. We also detected 119 alleles, and the effective allele number ranged from 1.4641 to 9.2911. The average heterozygosity of loci and breeds respectively varied from 0.2618 to 0.7672 and from 0.5196 to 0.7024. As well as SRCRSP23 site and Hexi cashmere goat had the highest average heterozygosity. Then we analyzed the phylogenetic trees (NJ and UPGMA), and found both of them were generally in accordance with their original breeding history and localities.

Effects of different culture system of isolating and passage of sheep embryonic stem-like cells / 生物工程学报

In this research, we use mouse embryonic fibroblasts as feeder layers. To eliminate the influence of serum and mouse embryonic stem cells (ESCs) conditioned medium (ESCCM) on self-renewal of sheep embryonic stem-like cells, knockout serum replacement (KSR) was used to replace serum, then supplanted with ESCCM for the isolation and cloning of sheep embryonic stem-like cells. We found when inner cell masses (ICMs) cultured in the control group with medium supplanted with fetal bovine serum (FBS), sheep ES-like cells could not survive for more than 3 passages. However, sheep embryonic stem-like cells could remain undifferentiated for 5 passages when cultured in the medium that FBS was substituted by KSR. The result indicates that KSR culture system was more suitable for the isolation and cloning of sheep embryonic stem-like cells compared to FBS culture system. Finally we applied medium with 15% KSR as basic medium supplanted with 40% ESCCM as a new culture system to isolate sheep embryonic stem-like cells, we found one embryonic stem-like cell line still maintained undifferentiating for 8 passages, which characterized with a normal and stable karyotype and high expression of alkaline phosphatase. These results suggest that it is suitable to culture sheep ICM in the new culture system with 15% KSR as basic medium and supplanted with 40% ESCCM, which indicated that mouse ES cells might secrete factors playing important roles in promoting sheep ES-like cells' self-renewal.

Establishment of fibroblast cell line and its biological characteristics in Matou goat / 生物工程学报

Taking Matou goat ear margin as the study material, we succeeded in established a fibroblast cell line by the method of explant culture directly. Observations on morphology, dynamic growth, determination of viability, analysis of karyotype, test of microorganism and other characteristics were detected. Results showed: Population Doubling Time (PDT) of cells was approximately 36 h; Cell viability was 96.7% after thawing; The status of cell After passage was constant; Analysis of chromosomal karyotyps indicated that diploid (2n=60) account for 98% in the cell line. Every index in the cell line met all the standard quality controls of ATCC in USA. The established of Matou goat ear fibroblast cell line has not only important genetic resources preserved at the cell level, but also valuable material for genome, postgenome and somatic cell nuclear transfer research.