Genes Linked to Growth in Pacific Pearl Oysters

Jenn Hoskins
25th July, 2024

Genes Linked to Growth in Pacific Pearl Oysters

Black-lip Pearl Shell (Pinctada margaritifera)

Photo adapted from: Ульяна Лалак / CC BY (Source)

Key Findings

  • The study focused on pearl oysters (Pinctada margaritifera) from French Polynesia to understand growth variability
  • Researchers found 394 genes that were differentially expressed between fast-growing and slow-growing oysters
  • Fast-growing oysters showed up-regulation of genes related to cell growth, division, and tissue development, while slow-growing oysters had genes linked to immune response and stress
The growth rate of bivalves, such as the pearl oyster Pinctada margaritifera, is a crucial trait for their commercial production. Growth in these organisms is a complex, polygenic trait, meaning it is regulated by many genes with small to moderate effects. Understanding the genetic basis of growth variability in shellfish has been challenging. A recent study by Ifremer aimed to investigate the differential gene expression among spat (juvenile oysters) of Pinctada margaritifera with distinct growth phenotypes[1]. The study focused on identifying the genes that are differentially expressed between fast-growing and slow-growing spat. By analyzing the gene expression profiles of these oysters, researchers hoped to uncover the genetic mechanisms that contribute to growth variability. This knowledge could potentially lead to more effective breeding programs aimed at enhancing growth rates in commercial bivalve production. To achieve this, the researchers collected spat with varying growth rates and performed RNA sequencing to identify differences in gene expression. RNA sequencing is a technique that allows scientists to measure the expression levels of thousands of genes simultaneously. By comparing the gene expression profiles of fast-growing and slow-growing oysters, the researchers identified a set of genes that were differentially expressed between the two groups. The findings of this study are significant for several reasons. Firstly, they provide insights into the genetic basis of growth variability in Pinctada margaritifera. Understanding which genes are involved in regulating growth can help in the development of selective breeding programs aimed at enhancing growth rates. Secondly, the study highlights the importance of gene expression analysis in understanding complex traits like growth. By identifying the genes that are differentially expressed, researchers can gain a better understanding of the underlying genetic mechanisms. This study builds on previous research in the field of aquaculture genetics. For example, earlier studies have shown that genomic selection can improve prediction accuracies of breeding values for traits that are difficult or expensive to measure[2]. In the case of the Portuguese oyster (Crassostrea angulata), genomic selection has been used to improve traits such as shell length, shell width, and disease resistance[2]. The current study on Pinctada margaritifera takes a similar approach by focusing on the genetic basis of growth, a trait that is crucial for commercial production. Moreover, the study aligns with the broader trend of applying genomics in aquaculture to optimize selective breeding programs[3]. Advances in sequencing and bioinformatics have made it possible to analyze the genetic basis of complex traits in a wide range of aquaculture species. By combining genomic selection with biotechnological innovations, such as genome editing, it may be possible to further expedite genetic improvement in aquaculture[3]. The findings also complement research on the physiological responses of fish to different rations. For instance, a study on coho salmon demonstrated that insulin-like growth factor I (IGF-I) levels respond to changes in diet and are correlated with growth rates[4]. While the current study on Pinctada margaritifera focuses on gene expression rather than hormone levels, both studies highlight the importance of understanding the biological mechanisms that regulate growth in aquaculture species. In conclusion, the recent study by Ifremer provides valuable insights into the genetic basis of growth variability in Pinctada margaritifera. By identifying differentially expressed genes, the researchers have taken an important step towards understanding the complex genetic mechanisms that regulate growth in these bivalves. This knowledge can be used to develop more effective breeding programs, ultimately enhancing the commercial production of pearl oysters.

BiotechGeneticsMarine Biology

References

Main Study

1) Comparative transcriptomics identifies genes underlying growth performance of the Pacific black-lipped pearl oyster Pinctada margaritifera

Published 24th July, 2024

https://doi.org/10.1186/s12864-024-10636-0

Related Studies

2) Prediction Accuracies of Genomic Selection for Nine Commercially Important Traits in the Portuguese Oyster (Crassostrea angulata) Using DArT-Seq Technology.

https://doi.org/10.3390/genes12020210

3) Harnessing genomics to fast-track genetic improvement in aquaculture.

https://doi.org/10.1038/s41576-020-0227-y

4) Effects of ration on somatotropic hormones and growth in coho salmon.

Journal: Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology, Issue: Vol 128, Issue 2, Feb 2001


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