Characterisation of genes transcriptionally upregulated in the liver of sand goby (Pomatoschistus minutus) by 17 alpha-ethinyloestradiol: Identification of distinct vitellogenin and zona radiata protein transcripts

JL Humble, E Hands, M Saaristo, Kai Lindström, KK Lehtonen, de Cerio OD, I Cancio, G Wilson, JA Craft

    Research output: Contribution to journalArticleScientificpeer-review

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    Abstract

    The sand goby (Pomatoschistus minutus), is a marine and estuarine teleost that is used in environmental, reproductive and behavioural studies of oestrogenic endocrine disruption. The xeno-oestrogen, 17 alpha-ethinyloestradiol (EE2), induces expression of egg proteins vitellogenin (VTG) and zona radiata protein (ZRP) in male fish and impairs reproduction. Multiple forms of VTG and ZRP genes are found in other teleost species, yet the characteristics of VTG and ZRP in the sand goby are unknown. In this investigation, Suppressive Subtractive Hybridization was used to isolate cDNA fragments from liver, identified as belonging to 11 distinct sand goby genes, suggesting that these genes are transcriptionally upregulated by EE2. Assembly of these fragments revealed three VTG genes which shared homology with VTG classes A, B and C in other fish and two ZRP genes sharing homology with ZRP classes Ba and Bb. RTqPCR of RNA from the sand goby liver was used to show that these VTGs and ZRPs were present in low levels in control males and high levels in mature females. Exposure of males to a concentration of 11 ng L-1 EE2 caused a significant increase in all VTG and ZRP transcript levels. The identification of these egg protein transcripts and the development of validated assays for their quantification will facilitate future work with this useful model species.
    Original languageUndefined/Unknown
    Pages (from-to)2722–2729
    Number of pages8
    JournalChemosphere
    Volume90
    Issue number11
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed

    Keywords

    • 17 alpha-ethinyloestradiol
    • Endocrine disruption
    • Sand goby
    • Vitellogenin
    • Zona radiata protein

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