title: Characterization and development of EST-SSR markers derived from transcriptome of yellow catfish.
abstract: Yellow catfish (Pelteobagrus fulvidraco) is one of the most important freshwater fish due to its delicious flesh and high nutritional value. However, lack of sufficient simple sequence repeat (SSR) markers has hampered the progress of genetic selection breeding and molecular research for yellow catfish. To this end, we aimed to develop and characterize polymorphic expressed sequence tag (EST)-SSRs from the 454 pyrosequencing transcriptome of yellow catfish. Totally, 82,794 potential EST-SSR markers were identified and distributed in the coding and non-coding regions. Di-nucleotide (53,933) is the most abundant motif type, and AC/GT, AAT/ATT, AAAT/ATTT are respective the most frequent di-, tri-, tetra-nucleotide repeats. We designed primer pairs for all of the identified EST-SSRs and randomly selected 300 of these pairs for further validation. Finally, 263 primer pairs were successfully amplified and 57 primer pairs were found to be consistently polymorphic when four populations of 48 individuals were tested. The number of alleles for the 57 loci ranged from 2 to 17, with an average of 8.23. The observed heterozygosity (HO), expected heterozygosity (HE), polymorphism information content (PIC) and fixation index (fis) values ranged from 0.04 to 1.00, 0.12 to 0.92, 0.12 to 0.91 and -0.83 to 0.93, respectively. These EST-SSR markers generated in this study could greatly facilitate future studies of genetic diversity and molecular breeding in yellow catfish.
authors.affiliation: Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Wenge
authors.initials: W
authors.lastname: Ma
authors.affiliation: Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Song
authors.affiliation: Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Qiaohong
authors.initials: Q
authors.lastname: Lin
authors.affiliation: Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China. jfgui@ihb.ac.cn.
authors.forename: Jian-Fang
authors.initials: JF
authors.lastname: Gui
authors.affiliation: Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China. jmei@mail.hzau.edu.cn.
authors.forename: Jie
authors.initials: J
authors.lastname: Mei
mesh_terms: D000818:Animals; D002397:Catfishes / Q000235:genetics*; D017931:DNA Primers / Q000032:analysis; D020224:Expressed Sequence Tags; D029941:Fish Proteins / Q000235:genetics*; D020869:Gene Expression Profiling / Q000379:methods*; D005819:Genetic Markers; D018895:Microsatellite Repeats; D012641:Selection, Genetic; D017423:Sequence Analysis, RNA
chemical_list: D017931:DNA Primers; D029941:Fish Proteins; D005819:Genetic Markers