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Baseline mRNA expression differs widely between common laboratory strains of zebrafish.
Scientific Reports 2018 March 20
Common strains of wildtype zebrafish (Danio rerio) have unique genomic features including SNPs and CNV, but strain information often goes unreported in the literature. As a result, the confounding effects of interstrain variation makes repetition of studies in zebrafish challenging. Here we analyze hepatic mRNA expression patterns between three common zebrafish strains (AB, Tuebingen (TU), and WIK) using Agilent 4 × 44 K gene expression microarrays to establish baseline mRNA expression across strains and between sexes. We observed wide variation in sex-specific gene expression within AB and WIK strains (141 genes in AB and 67 genes in WIK), but no significant variation between sexes within TU. After partitioning the dataset into male and female subsets, we detected 421 unique mRNA transcripts with statistically significant differential expression; 269 mRNA transcripts varied between males, 212 mRNA transcripts varied between females, and 59 mRNA transcripts varied across the three strains, regardless of sex. It is not surprising that mRNA expression profiles differ between sexes and strains, but it is imperative to characterize the differences. These results highlight the complexity of variation within zebrafish and underscore the value of this model system as a valid representation of normal variation present in other species, including humans.
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