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. 2014 Jun 18;15:491. doi: 10.1186/1471-2164-15-491

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© Teaniniuraitemoana et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Heat map of contigs differentially expressed between the ten different gonadic categories of P. margaritifera . Clusters of the 1,993 differentially expressed contigs (rows) were obtained with K-means clustering using Spearman’s correlation. Contigs showing similar expression profiles on all samples (columns) clustered together. (M/F)E: male/female at early stage; (M/F)I: male/female at intermediate stage; (M/F)M: male/female at mature stage; (M/F)R: male/female at stage of regression; Inv: gonads in sexual inversion; and Und: gonad sex is undetermined. Four main expression profiles are identified: Males and Females (genes expressed in both sexes with expression changing over the course of gametogenesis, 561 contigs); Males (genes highly expressed in males with expression increasing over the course of spermatogenesis, 815 contigs); Females (genes highly expressed in females with expression increasing over the course of oogenesis, 574 contigs); and genes more expressed in undetermined, early, regressed gonads and in gonads in sexual inversion (43 contigs). Color represents the normalized expression after variance-stabilizing transformation (DESeq). Expression levels are depicted with a color scale, in which shades of red represent higher expression and shades of green represent lower expression.