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Gene Response to Photoperiod Changes in the Atlantic salmon during Parr-Smolt Transformation

1. Gene Response to Photoperiod Changes in the Atlantic salmon during Parr-Smolt Transformation. Marlene Lorgen 1 , Elisa Casadei 1 , David Hazlerigg 1 and Sam Martin 1 1 School of Biological Sciences, University of Aberdeen. 2. Atlantic Salmon Life Cycle. Fresh Water. EGG.

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Gene Response to Photoperiod Changes in the Atlantic salmon during Parr-Smolt Transformation

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  1. 1 Gene Response to Photoperiod Changes in the Atlantic salmon during Parr-Smolt Transformation Marlene Lorgen1, Elisa Casadei1, David Hazlerigg1 and Sam Martin1 1School of Biological Sciences, University of Aberdeen

  2. 2 Atlantic Salmon Life Cycle Fresh Water EGG • Parr-Smolt Transformation (PST) • Critical transformation from freshwater juvenile (PARR) to sea water adapted juvenile (SMOLT) • Controlled by active thyroid hormone (T3) • T3 availability determined by action of deiodinases (Dios) • Dios regulated by photoperiod in birds and mammals • Increased Dio2 causes increase in T3 ALEVIN FRY PARR SMOLT SPAWNING ADULTS RETURNING ADULT Salt Water Salt Water

  3. 3 Dio Response to External Environment Gill Brain S. salar Dio Gene Identification: Partial Dio Sequences Cloned Fresh Salt Photoperiod, h Photoperiod, h STAY TUNED! Thanks for your Attention The Next Question: How do these 2 very similar genes respond to different signals? Dio2a NO CHANGE BLAST Show Response to External Environment S. salar Genome SALMONID Dio1 Salinity Responsive Dio3a1 Dio3a2 Dio3b Dio2a Ancestral Dio2 Dio2a Dio2b Dio2b Photoperiod Responsive 2 DIFFERENTIAL FUNCTIONALIZATION

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