The common littoral shrimp Palaemon serratus is an economically important decapod resource in some European communities. Aquaculture practices prevent the genetic deterioration of wild stocks caused by overfishing and at same time enhance production. biotechnological manipulation sex-related genes has proved potential to improve aquaculture production but scarcity genomic data about P. hinders these applications. RNA-Seq analysis been performed on ovary testis samples generate a reference...

Abstract Novel genetic resources now make it possible to directly assess the effects of natural selection on specific regions salmonid genome. Natural loci will also affect variation in linked flanking through “hitchhiking” effects, causing greater differentiation between populations than would be expected from purely neutral processes. Here we identify candidate genomic for differential two closely related steelhead–rainbow trout Oncorhynchus mykiss separated last century following...

Histones are small basic nuclear proteins with critical structural and functional roles in eukaryotic genomes. The H1 multigene family constitutes a very interesting histone class gathering the greatest number of isoforms, many different arrangements genome, including clustered solitary genes, showing replication-dependent (RD) or replication-independent (RI) expression patterns. evolution histones has been classically explained by concerted through rapid process interlocus recombination...

The variability in trophic position and carbon isotopic signatures can provide information about their dietary flexibility its ability to adapt changing environmental conditions. impact of the invasive blue crab Callinectes sapidus was assessed by estimating niche using stable isotopes (δ

The DNA content of 10 species bivalve molluscs from British Columbia coast was determined by image analysis, and the karyotypes horse clam Tressus capax, bent-nose macoma Macoma nasuta, nuttall's mahogany Nuttallia nuttallii are described here for first time. We also have analyzed location rDNA loci using a 28S-5.8S-18S probe in four these species: Mytilus californianus, M. trossulus, nasuta N. nuttallii. Results obtained report new data about cytogenetic characteristics molluscs.Key words:...

Random amplified polymorphic DNA (RAPD) analysis has been applied to the identification of four mussels species: Mytilus edulis, chilensis, galloprovincialis, and Perna canaliculus. Amplifications from mussel were carried out using random primers. The most distinctive bands then isolated, cloned, sequenced design specific Finally, different was with these primers, results allow genetic M. galloprovincialis rest species. Keywords: Mussels; Mytilus; RAPD; species

The hexamer repeat sequence (TTAGGG)(n), found at the ends of all vertebrate chromosomes, was previously identified as main building element one member a HindIII satellite DNA family characterized in genome bivalve mollusc Donax trunculus. It also 22 perfect tandem repeats cloned junction region juxtaposed to proper sequence, from which tract encompassing clustered copies excised and subcloned. Here, chromosomal distribution (TTAGGG)(n) sequences studied by sensitivity Bal31 exonuclease...

Mitochondria are mostly inherited by maternal via, that is, only mitochondria from eggs retained in the embryos. However, this general assumption of uniparentally transmitted, homoplasmic and non-recombining mitochondrial genomes is becoming more controversial. The presence different sequences mtDNA within a cell or individual, known as heteroplasmy, increasingly reported several taxon animals, such molluscs, arthropods vertebrates. In work, considerable frequency heteroplasmy were detected...

Internal transcribed spacer 1 and 2 (ITS1 ITS2) sequences were analysed in Ensis razor shells (Mollusca: Bivalvia: Pharidae). We aimed to (1) test ITS1 ITS2 as molecular markers at the population level successful alien E. directus (Conrad, 1843); (2) these spacers species three other species, siliqua (L., 1758), macha (Molina, 1782), magnus (Schumacher, 1817); (3) analyse evolutionary processes that may be shaping extant variation. In directus, despite intragenomic divergence detected,...

Several reports on the characterization of 5S ribosomal DNA (5S rDNA) in various animal groups have been published to date, but there is a lack studies analyzing this gene family much broader context. Here, we studied rDNA variation several molluskan species, including bivalves, gastropods, and cephalopods. The degree conservation transcriptional regulatory regions was analyzed these lineages, revealing conserved TATA-like box upstream region. evolution 120 bp coding region (5S) also...

Abstract Background The 5S ribosomal DNA (5S rDNA) is organized in tandem arrays with repeat units that consist of a transcribing region (5S) and variable nontranscribed spacer (NTS), higher eukaryotes. Until recently the rDNA was thought to be subject concerted evolution, however, several taxa, sequence divergence levels between NTS were found than expected under this model. So, many studies have shown birth-and-death processes selection can drive evolution rDNA. In analyses types genome,...

Abstract The rockpool shrimp Palaemon elegans is an ecologically important crustacean species within the European coastline fauna. In present study, genetic diversity and population structure connectivity were assessed by examining 21 polymorphic microsatellite loci at 13 sampling sites located along natural distribution range. All localities showed similar levels of variability. Significant deficits heterozygosity recorded, most likely due to presence null alleles. Genetic analyses revealed...

Rock lizards of the genus <i>Iberolacerta</i> constitute a promising model to examine process sex chromosome evolution, as these closely related taxa exhibit remarkable diversity in degree differentiation with no clear phylogenetic segregation, ranging from cryptic highly heteromorphic ZW chromosomes and even multiple systems (Z<sub>1</sub>Z<sub>1</sub>Z<sub>2</sub>Z<sub>2</sub>/Z<sub>1</sub>Z<sub>2</sub>W)....

We report the characterization of three satellite DNAs in four species mussel: Mytilus edulis, galloprovincialis, trossulus, and californianus. The monomers Apa I were 173, 161, 166 bp long. These used to construct phylogenetic trees infer relationships among these species. topologies obtained clearly indicate that M. californianus is most divergent with respect other three. Furthermore, localization on metaphase chromosomes was performed using fluorescent situ hybridization (FISH)....

This study documents the introduction of European Baltic prawn, Palaemon adspersus Rathke, 1837 to coastal waters northeastern North America, specifically west coast Newfoundland and Magdalen Islands in Gulf St. Lawrence, Canada.Species identification was verified using morphological genetic criteria.In September 2011, first specimens P. were collected Lawrence near Stephenville Crossing, Newfoundland, Canada.In 2012, additional this area at Andrew's, located further south western 2013...

The maintenance of species and the promotion speciation are closely related to chromosomal rearrangements throughout evolution. Decapoda represents most species-rich order among crustaceans and, despite its ecological economic importance, little is known about decapod karyology. We aim at cytogenetically characterizing two sympatric prawn species. Analysis mitotic metaphases meiotic diakinesis common Palaemon serratus rockpool P. elegans, revealed considerable differences between their...