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Peng J.,Academy of Fishery science | Wei P.,Academy of Fishery science | Chen X.,Academy of Fishery science | Zeng D.,Academy of Fishery science
Gene | Year: 2015

The Pacific white shrimp (Litopenaeus vannamei) is one of the most widely cultured shrimp species in the world. Despite L. vannamei having tropical origins, it is being reared subtropically, with low temperature stress being one of the most severe threats to its growth, survival and distribution. To unravel the molecular basis of cold tolerance in L. vannamei, the suppression subtractive hybridization (SSH) platform was employed to identify cold responsive genes in the hepatopancreas of L. vannamei. Both forward and reverse cDNA libraries were constructed, followed by dot blot hybridization, cloning, sequence analysis and quantitative real-time PCR. These approaches identified 92 cold induced and 48 cold inhibited ESTs to give a total of 37 cold induced and 17 cold inhibited contigs. Some of the identified genes related to stress response or cell defense, such as tetraspanins (TSPANs), DEAD-box helicase, heat shock proteins (HSPs) and metallothionein (MT), which were more abundant in the forward SSH library than in the reverse SSH library. The most abundant Est was a tetraspanin-8 (TSPAN8) homolog dubbed LvTSPAN8. A multiple sequence alignment and transmembrane domain prediction was also performed for LvTSPAN8. LvTSPAN8 expression was also examined in the gills, muscle, heart and hepatopancreas following cold exposure and showed the highest expression levels in the hepatopancreas. Overall, this study was able to identify several known genes and novel genes via SSH that appear to be associated with cold stress and will help to provide further insights into the molecular mechanisms regulating cold tolerance in L. vannamei. © 2015. Source


Zou Z.,Academy of Fishery science | Li D.,Academy of Fishery science | Zhu J.,Academy of Fishery science | Han J.,Academy of Fishery science | And 2 more authors.
Mitochondrial DNA | Year: 2015

The hybrid between Nile tilapia (Oreochromis niloticus,♀) and blue tilapia (O. aureus,♂) is an important strain in Chinese aquaculture industry. Two populations named AF (O. aureus, 29 samples) and NF (O. niloticus, 22 samples) were gathered from Freshwater Fisheries Research Center (FFRC). The other two named AG (O. aureus, 29 samples) and NG (O. niloticus, 28 samples) from Guangxi Fisheries Research Institute (GFRI). GFRI introduced AG and NG from AF and NF. The mitochondrial DNA D-loop was sequenced to assess the genetic diversity among four populations. A 580bp fragment was sequenced. The 93 variable sites defined 39 haplotypes and three were shared. As a result, the genetic diversity of O. aureus AF and AG was much lower (H=0.497-0.532, K=0.69-0.714, π=0.0012-0.00124) than that of O. niloticus (H=0.849-0.866, K=24.286-24.807, π=0.04246-0.04337). Furthermore, the indices (H, K, π and D) was a slight increase between AF and AG, so did NF and NG. These results indicated that as the male parent, the AF and AG population was purebred and sustainable. And as the female parent, NF and NG had high genetic diversity. The conclusions might give reference to keep the germplasm diversity of tilapia and other introduced fishes. © 2014 Informa UK Ltd. All rights reserved: reproduction in whole or part not permitted. Source

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