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- Title
Maternal effects in the inheritance of cold tolerance in blue tilapia ( Oreochromis aureus).
- Authors
Nitzan, Tali; Slosman, Tatiana; Gutkovich, Dina; Weller, Joel; Hulata, Gideon; Zak, Tatyana; Benet, Ayana; Cnaani, Avner
- Abstract
In accordance with their tropical origin, the optimal water temperature for most tilapia species is between 25 and 28 °C. The lethal temperature varies as a function of environmental effects, individual fish histories and genetic effects; however, the genetic basis of cold tolerance in tilapia has not been investigated in detail. Blue tilapia ( Oreochromis aureus) is considered as one of the most cold-tolerant tilapia species, and, in this study, we have used a fish from a three-generation selective breeding program for enhanced cold tolerance. Four crosses within and between resistant and sensitive fish were used in this study. Forty families were challenged for cold tolerance, and a strong maternal effect was observed in two consecutive experiments. Expression patterns of the mitochondrial ATP6 gene were strongly correlated with cold tolerance; however, an analysis that applied an individual animal model restricted maximum likelihood on a three-generation pedigree, implies that an epigenetic effect rather than mitochondrial inheritance is the main source of the observed maternal effect. This study demonstrates that maternal effects can play a significant role in the inheritance of cold tolerance and that maternally-transferred genetic components should be targeted when adaptation to low temperature is studied in tilapia.
- Subjects
OREOCHROMIS aureus; WATER temperature; FISH adaptation; GENOMIC imprinting; ANIMAL epigenetics; FISH breeding
- Publication
Environmental Biology of Fishes, 2016, Vol 99, Issue 12, p975
- ISSN
0378-1909
- Publication type
Article
- DOI
10.1007/s10641-016-0539-0