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Mollusc metagenome

ABSTRACT: Reproductive mode is associated with the bacterial microbiome of Potamopyrgus antipodarum, a New Zealand freshwater snail Targeted Locus (Loci)

PROVIDER: PRJNA271685 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1752540.fastq.gz	Fastqsanger.gz
	SRR1752550.fastq.gz	Fastqsanger.gz
	SRR1752560.fastq.gz	Fastqsanger.gz
	SRR1752570.fastq.gz	Fastqsanger.gz
	SRR1752580.fastq.gz	Fastqsanger.gz

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Role of epigenetics in adaptive evolution of an asexual snail (Lake Lytle)

Project description:We examined adaptive morphological divergence and epigenetic variation in genetically impoverished asexual populations of a freshwater snail, Potamopyrgus antipodarum from distinct environments. These populations exhibit environment-specific adaptive divergence in shell shape and significant genome wide DNA methylation differences among differentially adapted lake and fast water flow river populations. The epigenetic variation correlated with adaptive phenotypic variation in rapidly adapting asexual animal populations. This provides one of the first examples of environmentally-driven differences in epigenetics that associates with adaptive phenotypic divergence.

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Project description:Epigenetic variation might play an important role in generating adaptive phenotypes by underpinning within-generation developmental plasticity, persistent maternal effects of the environment (e.g., trans-generational plasticity), or heritable epigenetically based polymorphism. These adaptive mechanisms should be most critical in organisms where sources of variation are limited. Consequently, using a clonally reproducing freshwater snail (Potamopyrgus antipodarum), we examined the plasticity of an adaptive phenotype (shell shape) and of DNA methylation between generations by experimentally manipulating the current-speed environment in the lab. By comparing three generations of lab-reared snails with reference field populations, we showed that habitat-specific adaptive shell shape is stable across one generation, and adaptively responds gradually over two subsequent generations. We also showed that DNA methylation specific to high-current environments was stable across one generation. Together these observations suggest that shell shape variation is at least in part determined by transgenerational plasticity and that DNA methylation provides a potential mechanism.

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Project description:Epigenetic variation has the potential to control environmentally dependent development and contribute to phenotypic responses to local environments. Environmental epigenetic studies of sexual organisms confirm the responsiveness of epigenetic variation, which should be even more important when genetic variation is lacking. A previous study of an asexual snail, Potamopyrgus antipodarum, demonstrated that different populations derived from a single clonal lineage differed in both shell phenotype and methylation signature when comparing lake versus river populations. Here, we examine methylation variation among lakes that differ in environmental disturbance and pollution histories. The differential DNA methylation regions (DMRs) identified among the different lake comparisons suggested a higher number of DMRs and variation between rural Lake 1 and one urban Lake 2 and between the two urban Lakes 2 and 3, but limited variation between the rural Lake 1 and urban Lake 3. DMR genomic characteristics and gene associations were investigated. Observations suggest there is no effect of geographic distance or any consistent pattern of DMRs between urban and rural lakes. Environmental factors may influence epigenetic response.

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