A5063243705- Chromosomal and Genetic Variations
- Fish biology, ecology, and behavior
- Fish Biology and Ecology Studies
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Amphibian and Reptile Biology
- Genetic diversity and population structure
- Animal Genetics and Reproduction
- Turtle Biology and Conservation
- CRISPR and Genetic Engineering
- Fish Ecology and Management Studies
- Genomics and Phylogenetic Studies
- Identification and Quantification in Food
- Ichthyology and Marine Biology
- Evolution and Genetic Dynamics
- Evolution and Paleontology Studies
- Plant Virus Research Studies
- Marine animal studies overview
- Insect and Pesticide Research
- Reproductive biology and impacts on aquatic species
- Animal Behavior and Reproduction
- Venomous Animal Envenomation and Studies
- Marine Ecology and Invasive Species
- Adhesion, Friction, and Surface Interactions
- Paleontology and Evolutionary Biology
- Phytochemicals and Medicinal Plants
National Institute of Amazonian Research
2016-2025
University of Canberra
2019
Universidade de São Paulo
2018
Abstract Most of snakes exhibit a ZZ/ZW sex chromosome system, with different stages degeneration. However, undifferentiated chromosomes and unique Y sex-linked markers, suggest that an XY system has also evolved in ancestral lineages. Comparative cytogenetic mappings revealed several genes share ancestry among X, Z chromosomes, implying ZW may have undergone transitions during serpent’s evolution. In this study, we performed comparative analysis to identify homologies across (Henophidia)...
Abstract Centromochlus heckelii has the lowest diploid chromosome number (2n = 46) and only described heteromorphic sex system in Auchenipteridae. This study presents a population of C. from Central Amazon basin with subtle variations karyotype composition variant W distinct morphology increased C-positive heterochromatin content. In this population, is subtelocentric, whereas previous on reported metacentric chromosome. Constitutive (CH) accumulation microsatellite motifs have significantly...
Introduction: Needlefish (Belonidae family) comprises 44 known species distributed worldwide. These are predominantly marine but include estuarine representatives and 12 freshwater species. Among the recognized species, eight endemic to South American rivers. Cytogenetic studies of Belonidae scarce mostly limited describing diploid chromosome number (2n) karyotypic structure. Methods: We used classical molecular cytogenetic markers karyotypically characterize Pseudotylosurus microps...
Cytogenetic studies on Potamotrygon motoro (Müller & Henle, 1841) are limited to classical cytogenetic techniques, but they do reveal great karyotypic variation. The main differences related the formula and absence/presence of sex chromosome systems. Thus, this study aimed expand knowledge composition from different locations Central Amazon using Fluorescence in situ Hybridization investigate distribution ribosomal DNAs (rDNA) microsatellites sequences (SSRs). In addition, we used...
Abstract Sea-level changes during the Pleistocene and geomorphological history have largely molded intricate shaping of coastal drainages in Eastern South America. Therefore, freshwater fishes from this region are promising models to infer how riverine isolation reconnections affected their genetic diversification geographic distribution. In present study, we provided a detailed cytogenomic analysis Ancistrus multispinis brevipinnis, including physical mapping repetitive DNA classes, verify...
Although fishes have traditionally been the subject of comparative evolutionary studies, few reports concentrated on application multipronged modern molecular cytogenetic techniques (such as genomic hybridization = CGH and whole chromosome painting WCP) to analyze deeper karyotype evolution specific groups, especially historically neglected small-sized ones. Representatives family Lebiasinidae (Characiformes) are a notable example, where only investigations conducted thus far. Here, we aim...
Osteoglossiformes represents one of the most ancestral teleost lineages, currently widespread over almost all continents, except for Antarctica. However, data involving advanced molecular cytogenetics or comparative genomics are yet largely limited this fish group. Therefore, present investigations focus on osteoglossiform family Arapaimidae, studying a unique model group with cytogenetic genomic tools. The aim is to better explore and clarify certain events factors that had impact...
Arowanas (Osteoglossinae) are charismatic freshwater fishes with six species and two genera (Osteoglossum Scleropages) distributed in South America, Asia, Australia. In an attempt to provide a better assessment of the processes shaping their evolution, we employed set cytogenetic genomic approaches, including i) molecular analyses using C- CMA3/DAPI staining, repetitive DNA mapping, comparative hybridization (CGH), Zoo-FISH, along ii) genotypic single nucleotide polymorphisms (SNPs)...
Rineloricaria is the most diverse genus within freshwater fish subfamily Loricariinae, and it widely distributed in Neotropical region. Despite limited cytogenetic data, records from southern south-eastern Brazil suggest a high rate of chromosomal rearrangements this genus, mirrored remarkable inter- intraspecific karyotype variability. In present work, we investigated features teffeana, an endemic representative northern Brazil, using both conventional molecular techniques. We revealed...
Centromochlinae is a widely diverse subfamily with more than 50 species and several taxonomic conflicts due to morphological similarity between Tatia Centromochlus species. However, cytogenetic studies on this group have been limited only four so far. Therefore, here we present the karyotype of schultzi from Xingu River in Brazil using classic techniques, physical mapping 5S 18S rDNAs, telomeric sequences (TTAGGG)n. The had 58 chromosomes, simple NORs rDNA sites. Heterochromatic regions were...
Boids are primitive snakes from a basal lineage that is widely distributed in Neotropical region. Many of these species both morphologically and biogeographically divergent, the relationship among some remains uncertain even with evolutionary phylogenetic studies being proposed for group. For better understanding between snakes, we cytogenetically analysed 7 3 subspecies Boidae family using different chromosomal markers. The karyotypes Boa constrictor occidentalis, Corallus hortulanus,...
Lebiasinidae is a Neotropical freshwater family widely distributed throughout South and Central America. Due to their often very small body size, species are cytogenetically challenging hence largely underexplored. However, the available but limited karyotype data already suggested high interspecific variability in diploid chromosome number (2n), which pronounced speciose genus Nannostomus, popular taxon ornamental fish trade due its remarkable coloration. Aiming more deeply examine...
Lebiasinidae fishes have been historically neglected by cytogenetical studies. Here we present a genomic comparison in eleven species, addition to review of the ribosomal DNA sequences distribution this family. With that, develop ten sets experiments order hybridize representative species from genus Copeina, Copella, Nannostomus, and Pyrrhulina metaphase plates Lebiasina melanoguttata. Two major pathways on chromosomal evolution these can be recognized: (i) conservation 2n = 36 bi-armed...
This study provides new insight into the chromosomal diversification in Loricariinae. We analyzed nine species from different Brazilian hydrographic basins, using conventional and molecular cytogenetic methods, aiming to understand karyotypic diversification, contribute with cytotaxonomic markers this group considered one of most diverse Loricariidae. Our results evidenced a high variability diploid number (2n) ranging 2n = 54 (Loricariichthys platymetopon Loricariichthys anus), 60...
A remarkable morphological diversity and karyotype variability can be observed in the Neotropical armored catfish genus Harttia. These fishes offer a useful model to explore both evolution of karyotypes sex chromosomes, since many species possess male-heterogametic chromosome systems high rate repatterning. Based on organization, chromosomal distribution several repetitive DNA classes, rough estimates genomic divergences at intraspecific interspecific levels via Comparative Genomic...
Amazonian puffing snakes (Spilotes; Colubridae) are widely distributed in the Neotropical region. However, chromosomal data scarce this group and, when available, only limited to karyotype description using conventional staining. In paper, we focused on process of evolution and trends for sex chromosomes two Puffer Snakes (S. pulllatus S. sulphureus). We performed an extensive characterization molecular cytogenetic approaches. The sulphureus (presented here first time) exhibits a 2n = 36,...
The Neotropical region exhibits the greatest worldwide diversity and diversification history of several clades is related to puzzling geomorphologic climatic this region. freshwater Amazon ecoregion contains main hydrographic basins that are highly dendritic ecologically diverse. It a rich endemic fish fauna, including one its most iconic economically important representatives, bony‐tongue Arapaima gigas (Teleostei, Osteoglossiformes). Here, we evaluated projected distribution genus in...
Although crocodilians have attracted enormous attention in other research fields, from the cytogenetic point of view, this group remains understudied. Here, we analyzed karyotypes eight species formally described Alligatoridae family using differential staining, fluorescence situ hybridization with rDNA and repetitive motifs as a probe, whole chromosome painting (WCP), comparative genome hybridization. All Caimaninae diploid number (2n) 42 dominated by acrocentric chromosomes, contrast to...
Lebiasinidae is a small fish family composed by miniature to small-sized fishes with few cytogenetic data (most of them limited descriptions diploid chromosome numbers), thus preventing any evolutionary comparative studies at the chromosomal level. In present study, we are providing, first for red spotted tetra, Copeina guttata, including standard karyotype, C-banding, repetitive DNA mapping fluorescence in situ hybridization (FISH) and genomic (CGH), providing patterns novel insights into...
Currently, there are 38 valid species of freshwater stingrays, and these belong to the subfamily Potamotrygoninae. However, cytogenetic information about this group is limited, with studies mainly using classical techniques, Giemsa, C-banding.
Chatogekko amazonicus is a miniaturized gecko from northern South America and among the smallest of toe pad bearing lizards. The pads C. are miniscule, between 18% 27% plantar surface area. We aimed to investigate relationship adhesive morphology, body size, capabilities. Using scanning electron microscopy, we determine that exhibit branched setae similar those other geckos, but generally much smaller. When compared with taxa, show occupy range seta length: snout-vent length ratio aspect as...
Ctenoluciidae is a Neotropical freshwater fish family whose representatives are known as bicudas. The genus Boulengerella contains 5 species, and 4 of them (B. cuvieri, B. lateristriga, lucius, maculata) were cytogenetically analyzed in the present study by conventional molecular procedures. All species have very similar karyotype, with 2n = 36 chromosomes (14 metacentrics + 16 submetacentrics 6 subtelocentrics; FN 72). However, heterochromatin distribution pattern species-specific. In all...