Applications of microsatellite markers in studies of genetics and breeding of fish

2006 ◽  
Vol 3 (2) ◽  
pp. 83-87 ◽  
Author(s):  
Zhang Xiao-Gu ◽  
Tong Jin-Gou ◽  
Xiong Bang-Xi
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Population Genetic ◽  
Germplasm Conservation ◽  
Genomic Mapping ◽  
Short Sequence ◽  
Sequence Repeat ◽  
Short Sequence Repeat ◽  
Food Fish ◽  
Polymorphic Microsatellite

AbstractThe microsatellite, or short sequence repeat (SSR), is a powerful genetic marker, useful in many areas of fish genetics and breeding. Polymorphic microsatellite loci have been frequently applied to the analysis of genetic diversity, population genetic structure, and genomic mapping. These co-dominant markers have also been applied to the classification and systematics, parentage identification, germplasm conservation, and breeding programme of food fish.

scholarly journals Isolation and characterization of polymorphic microsatellite loci for Pistacia chinensis Bunge (Anacardiaceae)

2019 ◽  
Vol 68 (1) ◽  
pp. 26-28 ◽  
Author(s):  
Zhaohong Ding ◽  
Jianbo Lu
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Microsatellite Loci ◽  
Population Genetic ◽  
Magnetic Beads ◽  
Genomic Library ◽  
Landscape Fragmentation ◽  
Isolation And Characterization ◽  
Bioenergy Plant ◽  
Polymorphic Microsatellite

Abstract Pistacia chinensis Bunge (Anacardiaceae) is a native, dioecious, perennial arbor, and an important bioenergy plant. Twelve microsatellite markers were developed for P. chinensis to evaluate genetic diversity and population genetic structure when this species was subject to landscape fragmentation. Twelve polymorphic microsatellite loci were developed in P. chinensis using a microsatellite-enriched genomic library based on magnetic beads. These loci were characterized in 24 individuals from three populations located on Thousand Island Lake, Zhejiang Province, China. The number of alleles per locus varied from three to sixteen. The observed and expected heterozygosity ranged from 0.1250 to 0.8750 and 0.2333 to 0.8917, respectively. These microsatellite loci will be applied in further studies on the population genetic diversity and genetic structure of P. chinensis. This study will improve understanding of the effects of landscape fragmentation, and help conserve and manage the species.

scholarly journals Genetic Diversity of a Natural Population of Akebia trifoliata (Thunb.) Koidz and Extraction of a Core Collection Using Simple Sequence Repeat Markers

2021 ◽  
Vol 12 ◽  
Author(s):  
Yicheng Zhong ◽  
Yue Wang ◽  
Zhimin Sun ◽  
Juan Niu ◽  
Yaliang Shi ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Simple Sequence Repeat ◽  
Core Collection ◽  
Polymorphic Information Content ◽  
Germplasm Conservation ◽  
Sequence Repeat ◽  
Information Index ◽  
Molecular Identity ◽  
Simple Sequence

Understand genetic diversity and genetic structure of germplasm is premise of germplasm conservation and utilization. And core collection can reduce the cost and difficulty of germplasm conservation. Akebia trifoliata (Thunb.) Koidz is an important medicinal, fruit and oil crop, particularly in China. In this study, 28 simple sequence repeat (SSR) markers were used to assess the genetic diversity and genetic structure of 955 A. trifoliata germplasms, determine their molecular identity and extract a core collection. The genetic diversity of the 955 germplasms was moderately polymorphic. The average number of alleles (Na), observed heterozygosity (HO), expected heterozygosity (HE), Shannon’s information index (I∗), and polymorphic information content (PIC) were 3.71, 0.24, 0.46, 0.81, and 0.41, respectively. Four subpopulations were identified, indicating a weak genetic structure. A 955 germplasms could be completely distinguished by the characters of s28, s25, s74, s89, s68, s30, s13, s100, s72, s77, and s3. And each germplasm’s molecular identity was made up of eleven characters. The core collection was composed of 164 germplasms (17.2% of 955 total germplasms in the population) and diversity parameters differed significantly from those of a random core collection. These results have implications for germplasm conservation. At the same time, based on the results, the 955 germplasm could be better used and managed.

scholarly journals Intraspecific divergences and phylogeography of Panzerina lanata (Lamiaceae) in Northwest China

2018 ◽  
Author(s):  
Yanfen Zhao ◽  
Hongxiang Zhang ◽  
Borong Pan ◽  
Mingli Zhang
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Population Genetic ◽  
Divergence Time ◽  
Northwest China ◽  
Northwestern China ◽  
Intraspecific Diversity ◽  
Early Pleistocene ◽  
Helan Mountains ◽  
The Impact

Climactic fluctuations during the Quaternary played a crucial role in genetic diversity and population genetic structure of many plant species in northwestern China. In order to understand the impact of climate change on herbaceous plants, we studied Panzerina lanata (Lamiaceae), a widely distributed species. Two chloroplast DNA intergenic spacers (trnH-psbA and rpoB-trnC) were used to sequence 269 individuals from 27 populations and seven haplotypes were identified. Genetic structure and demographic characteristics were estimated using AMOVA, neutrality tests, and mismatch distribution analyses. The divergence times between the seven haplotypes were estimated using Beast. Our results revealed high levels of total genetic diversity (HT = 0.673±0.0869) and low levels of average within-population genetic diversity (HS = 0.033±0.0214). The analysis of molecular variance indicated major genetic differentiation among the three groups: northern, central, and eastern group. The species distribution modeling and demographic analysis indicated that P. lanata has not experience a recent range expansion. The divergence time within P. lanata occurred between the early Pleistocene and the late Pleistocene, which coincides with aridification and the expansion of the deserts in northwestern China that resulted in species diversification and habitat fragmentation. In addition, we speculate that the deserts and the Helan Mountains acted as effective geographic barriers that led to intraspecific diversity.

scholarly journals Genomic epidemiology ofMycobacterium bovisinfection in sympatric badger and cattle populations in Northern Ireland

2021 ◽  
Author(s):  
Assel Akhmetova ◽  
Jimena Guerrero ◽  
Paul McAdam ◽  
Liliana C.M. Salvador ◽  
Joseph Crispell ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Spatial Distribution ◽  
Genetic Structure ◽  
Northern Ireland ◽  
Population Genetic Structure ◽  
Population Genetic ◽  
Transmission Dynamics ◽  
Data Set ◽  
Hair Samples ◽  
Disease Persistence

AbstractBackgroundBovine tuberculosis (bTB) is a costly epidemiologically complex, multi-host, endemic disease. Lack of understanding of transmission dynamics may undermine eradication efforts. Pathogen whole genome sequencing improves epidemiological inferences, providing a means to determine the relative importance of inter- and intra- species host transmission for disease persistence. We sequenced an exceptional data set of 619Mycobacterium bovisisolates from badgers and cattle in a 100km2bTB ‘hotspot’ in Northern Ireland. Historical molecular subtyping data permitted the targeting of an endemic pathogen lineage, whose long-term persistence provided a unique opportunity to study disease transmission dynamics in unparalleled detail. Additionally, to assess whether badger population genetic structure was associated with the spatial distribution of pathogen genetic diversity, we microsatellite genotyped hair samples from 769 badgers trapped in this area.ResultsGraph transmission tree methods and structured coalescent analyses indicated the majority of bacterial diversity was found in the local cattle population. Results pointed to transmission from cattle to badger being more common than badger to cattle. Furthermore, the presence of significant badger population genetic structure in the landscape was not associated with the spatial distribution ofM. bovisgenetic diversity, suggesting that badger-to-badger transmission may not be a key determinant of disease persistence.SignificanceOur data were consistent with badgers playing a smaller role in the maintenance ofM. bovisinfection in this study site, compared to cattle. Comparison to other areas suggests thatM. bovistransmission dynamics are likely to be context dependent, and the role of wildlife difficult to generalise.

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