Characterization of DNA methylation in the Flat tree oyster (Isognomon alatus) and its correlation with environmental abiotic factors

Organisms spanning numerous taxa have been shown to mediate stress responses by utilizing epigenetic mechanisms, notably DNA methylation. This study aimed to characterize the seasonal patterns in DNA methylation in the gill tissue of the flat tree oyster (Isognomon alatus) and its response to temperature, pH and salinity variations in Miami’s Northern Biscayne Bay. Flat tree oyster specimens attached to mangrove prop roots by their byssus were sampled from ten distinct sites across the bay that differed by their geographical and physicochemical characteristics. Quantification of DNA methylation from gill tissue show a sinusoidal-like seasonal pattern throughout time. Despite a clear seasonal trend, analyses revealed that there is no significant correlation between abiotic parameters (temperature, pH, salinity) and variations of DNA methylation. On the other hand, this report showed that methylation levels of oysters were highest at sites with the greatest potential sources of pollution. Further studies are required to determine if water pollutants or other chemical factors may be influencing seasonal patterns in DNA methylation and if observed seasonal trends are consistent throughout subsequent years

Entrée : Fédéralisme

International audienc

Entrée : Exécutif

International audienc

Apport des traceurs naturels à la compréhension des transferts au sein des formations argileuses compactées

ORSAY-PARIS 11-BU Sciences (914712101) / SudocSudocFranceF

Symmetry-adapted tensorial formalism to model rovibrational and rovibronic spectra of molecules pertaining to various point groups

International audienceWe present a short review on the tensorial formalism developed by the Dijon group to solve molecular spectroscopy problems. This approach, originally devoted to the rovibrational spectroscopy of highly symmetrical species (spherical tops) has been recently extended in several directions: quasi-spherical tops, some symmetric and asymmetric tops, and rovibronic spectroscopy of spherical tops in a degenerate electronic state. Despite its apparent complexity (heavy notations, quite complex mathematical tools), these group theoretical tensorial methods have a great advantage of flexibility: a systematic expansion of effective terms for any rovib- rational/rovibronic problem up to a given order is automatically generated. Inclusion of all possible interaction terms for any polyad scheme is therefore easy. This makes such an approach suitable for many types of molecular problems, not only the most symmetric ones