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https://www.readbyqxmd.com/read/27832130/detecting-mechanisms-of-karyotype-evolution-in-heterotaxis-orchidaceae
#1
Ana Paula Moraes, André Olmos Simões, Dario Isidro Ojeda Alayon, Fábio de Barros, Eliana Regina Forni-Martins
The karyotype is shaped by different chromosome rearrangements during species evolution. However, determining which rearrangements are responsible for karyotype changes is a challenging task and the combination of a robust phylogeny with refined karyotype characterization, GS measurements and bioinformatic modelling is necessary. Here, this approach was applied in Heterotaxis to determine what chromosome rearrangements were responsible for the dysploidy variation. We used two datasets (nrDNA and cpDNA, both under MP and BI) to infer the phylogenetic relationships among Heterotaxis species and the closely related genera Nitidobulbon and Ornithidium...
2016: PloS One
https://www.readbyqxmd.com/read/27830045/karyotype-diversity-of-pseudoscorpions-of-the-genus-chthonius-pseudoscorpiones-chthoniidae-in-the-alps
#2
Jana Kotrbová, Vera Opatova, Giulio Gardini, František Šťáhlavský
Pseudoscorpions are found in almost all terrestrial habitats. However, their uniform appearance presents a challenge for morphology-based taxonomy, which may underestimate the diversity of this order. We performed cytogenetic analyses on 11 pseudoscorpion species of the genus Chthonius C. L. Koch, 1843 from the Alps, including three subgenera: Chthonius (Chthonius) C. L. Koch, 1843, Chthonius (Ephippiochthonius) Beier, 1930 and Chthonius (Globochthonius) Beier, 1931 inhabiting this region. The results show that the male diploid number of chromosomes ranges from 21-35...
2016: Comparative Cytogenetics
https://www.readbyqxmd.com/read/27797956/a-portrait-of-ribosomal-dna-contacts-with-hi-c-reveals-5s-and-45s-rdna-anchoring-points-in-the-folded-human-genome
#3
Shoukai Yu, Bernardo Lemos
Ribosomal rRNAs account for >60% of all RNAs in eukaryotic cells and are encoded in the ribosomal DNA (rDNA) arrays. The rRNAs are produced from two sets of loci: the 5S rDNA array resides exclusively on human chromosome 1, while the 45S rDNA array resides on the short arm of five human acrocentric chromosomes. The 45S rDNA gives origin to the nucleolus, the nuclear organelle that is the site of ribosome biogenesis. Intriguingly, 5S and 45S rDNA arrays exhibit correlated copy number variation in lymphoblastoid cells (LCLs)...
October 25, 2016: Genome Biology and Evolution
https://www.readbyqxmd.com/read/27785415/recurrent-increased-nuchal-translucency-a-first-trimester-presentation-of-familial-13p-satellite-deletion
#4
I Uzun, R Has, E Alici, M Ozdemir, C Inan, S Erzincan
Chromosome 13 is one of the acrocentric chromosomes of the human karyotype. Acrocentric chromosomes are the most variable chromosomes in the human karyotype and these variations appear to have no clinical consequences. To the best of our knowledge, this is the first reported case of a first trimester presentation of a 13 short arm satellite deletion with markedly increased nuchal translucency (NT). In this case, the 13p short arm satellite deletion was associated with increased NT in two pregnancies from the same couple...
July 1, 2016: Balkan Journal of Medical Genetics: BJMG
https://www.readbyqxmd.com/read/27784020/classical-and-molecular-cytogenetics-of-the-panther-genet-genetta-maculata-mammalia-carnivora-viverridae
#5
Raquel Matoso Silva, Filomena Adega, Helena J Kjöllerström, Kim Labuschagne, Antoinette Kotze, Carlos Fernandes, Raquel Chaves, Maria do Mar Oom
Genets (Genetta) are a genus of African mammalian carnivorans with 14 currently recognized species, although taxonomic uncertainties remain, particularly regarding the number of species within the large-spotted genet complex. This study presents the first banded karyotype and molecular cytogenetic analysis of a genetically identified panther genet, Genetta maculata, the most common and widespread taxon of the large-spotted genet complex, with a wide distribution in sub-Saharan Africa. Sampled in Gauteng Province, South Africa, it could be assigned to the subspecies G...
October 27, 2016: Cytogenetic and Genome Research
https://www.readbyqxmd.com/read/27710958/karyotype-and-mapping-of-repetitive-dnas-in-the-african-butterfly-fish-pantodon-buchholzi-the-sole-species-of-the-family-pantodontidae
#6
Petr Ráb, Cassia F Yano, Sébastien Lavoué, Oladele I Jegede, Luiz A C Bertollo, Tariq Ezaz, Zuzana Majtánová, Ezequiel A de Oliveira, Marcelo B Cioffi
The monophyletic order Osteoglossiformes represents one of the most ancestral groups of teleosts and has at least 1 representative in all continents of the southern hemisphere, with the exception of Antarctica. However, despite its phylogenetic and biogeographical importance, cytogenetic data in Osteoglossiformes are scarce. Here, karyotype and chromosomal characteristics of the lower Niger River population of the African butterfly fish Pantodon buchholzi, the sole species of the family Pantodontidae (Osteoglossiformes), were examined using conventional and molecular cytogenetic approaches...
October 7, 2016: Cytogenetic and Genome Research
https://www.readbyqxmd.com/read/27698378/characterization-of-a-very-rare-case-of-living-ewe-buck-hybrid-using-classical-and-molecular-cytogenetics
#7
Alfredo Pauciullo, Christoph Knorr, Angela Perucatti, Alessandra Iannuzzi, Leopoldo Iannuzzi, Georg Erhardt
The natural occurrence of live hybrid offsprings between sheep and goats has been documented in literature, however all the studies have reported the mating of goats with rams, whereas the reciprocal cross was never documented. This study reports on a very rare case of interspecies hybridization occurred between a ewe (2n = 54, XX) and a buck (2n = 60, XY). The hybrid, born in a German flock under natural conditions, is characterised by an intermediate karyotype (2n = 57, XX). The CBA-banding has shown 3 metacentric and 54 acrocentric chromosomes, whereas the GTG- and RBA-banding have revealed that the autosomes involved in the hybrid combination were CHI1, 3; CHI2, 8 and CHI5, 11 corresponding to the metacentric chromosomes OAR1, OAR2 and OAR3...
October 4, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27676413/first-report-of-sex-chromosomes-in-achiridae-teleostei-pleuronectiformes-with-inferences-about-the-origin-of-the-multiple-x1x1x2x2-x1x2y-system-and-dispersal-of-ribosomal-genes-in-achirus-achirus
#8
Jamille A Bitencourt, Iracilda Sampaio, Robson T C Ramos, Marcelo Ricardo Vicari, Paulo Roberto A de M Affonso
American soles (family Achiridae) have been characterized by remarkable chromosomal variation even though several species lack basic cytogenetic information. This trend indicates that chromosomal traits can be useful to taxonomy once the morphological identification of some taxa in this family (e.g., Achirus species) is controversial. In this work, we expand the cytogenetic data in Achiridae by providing the first karyotypic analysis of Achirus achirus. An unusual multiple sex chromosome system (X1X1X2X2/X1X2Y) was detected, once males presented 2n = 33 with three unpaired chromosomes (X1X2Y) while females presented 2n = 34 with two acrocentric pairs (X1X1 and X2X2) found in hemizygosis in males...
September 27, 2016: Zebrafish
https://www.readbyqxmd.com/read/27576706/the-relationship-between-human-nucleolar-organizer-regions-and-nucleoli-probed-by-3d-immunofish
#9
Marjolein van Sluis, Chelly van Vuuren, Brian McStay
3D-immunoFISH is a valuable technique to compare the localization of DNA sequences and proteins in cells where three-dimensional structure has been preserved. As nucleoli contain a multitude of protein factors dedicated to ribosome biogenesis and form around specific chromosomal loci, 3D-immunoFISH is a particularly relevant technique for their study. In human cells, nucleoli form around transcriptionally active ribosomal gene (rDNA) arrays termed nucleolar organizer regions (NORs) positioned on the p-arms of each of the acrocentric chromosomes...
2016: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27551348/chromosome-comparison-of-17-species-sub-species-of-african-goliathini-coleoptera-scarabaeidae-cetoniinae
#10
Anne-Marie Dutrillaux, Bernard Dutrillaux
The mitotic karyotypes of 17 species of African Goliathini (Cetoniinae) are described using various chromosome banding techniques. All but one are composed of 20 chromosomes, mostly metacentric, forming a karyotype assumed to be close to that of the Polyphaga ancestor. The most derived karyotypes are those of Goliathus goliatus Drury, 1770, with eight pairs of acrocentrics and Chlorocana africana Drury, 1773, with only14 chromosomes. In species of the genera Cyprolais Burmeister, 1842, Megalorhina Westwood, 1847, Stephanocrates Kolbe, 1894 and Stephanorrhina Burmeister, 1842, large additions of variable heterochromatin are observed on both some particular autosomes and the X chromosome...
2016: Comparative Cytogenetics
https://www.readbyqxmd.com/read/27488622/cryptic-caribbean-species-of-scorpaena-actinopterygii-scorpaeniformes-suggested-by-cytogenetic-and-molecular-data
#11
M Nirchio, C Oliveira, Z R Siccha-Ramirez, V F Sene, O R Sánchez-Romero, N R Ehemann, V Milana, A R Rossi, L Sola
Cytogenetic and molecular analyses enabled identification of two cytotypes among individuals of the spotted scorpion fish Scorpaena plumieri from Margarita Island, Venezuela. Cytotype 1 was characterized by 48 subtelo-acrocentric chromosomes and fundamental number (number of chromosome arms; FN) equalled 48, while cytotype 2 was characterized by two metacentric and 46 subtelo-acrocentric chromosomes and FN was 50. These cytotypes also differed in the location of the ribosomal gene clusters and in the distribution of the constitutive heterochromatin...
October 2016: Journal of Fish Biology
https://www.readbyqxmd.com/read/27478773/homozygosity-for-a-robertsonian-translocation-13q-14q-in-a-phenotypically-normal-44-xx-female-with-a-history-of-recurrent-abortion-and-a-normal-pregnancy-outcome
#12
Mohammad Miryounesi, Mehdi Diantpour, Elahe Motevaseli, Soudeh Ghafouri-Fard
BACKGROUND: Robertsonian translocations are structural chromosomal abnormalities caused by fusion of two acrocentric chromosomes. In carriers of such translocations, different modes of segregations would result in the formation of either balanced (alternate segregation mode) or unbalanced (adjacent 1, adjacent 2, and 3:1 segregation modes) gametes. In addition, there is an increased risk for imprinting disorders in their offspring. Although it has been estimated that 1/1000 healthy persons carry a Robertsonian translocation, homozygosity for this type of structural chromosomal abnormality has been reported rarely...
July 2016: Journal of Reproduction & Infertility
https://www.readbyqxmd.com/read/27454823/karyoevolutionary-inferences-in-enigmatic-taxon-astyanax-teleostei-characidae
#13
Luana Pereira Dos Santos, Carine Mendonça Francisco, Jonathan Pena Castro, Patrícia Barbosa, Sandra Morelli, Luiz Antonio de Oliveira, Roberto Ferreira Artoni
Accessing the taxonomy of fish is a basic condition for the conservation of species, and the understanding of their evolutionary relationships. Many Neotropical species of fishes of the order Characiformes are considered incertae sedis because of a lack of consistent evidence of monophyly, with the genus Astyanax among them. With a cytotaxonomic and evolutionary purpose, we compared the karyotype of two species of Astyanax: Astyanax paranae and Astyanax elachylepis. Conventional cytogenetic analyses revealed 2n = 50 chromosomes for the two species, with interspecific and interpopulation karyotype variations...
December 2016: Zebrafish
https://www.readbyqxmd.com/read/27454711/first-cytogenetic-description-of-microsternarchus-bilineatus-gymnotiformes-hypopomidae-from-negro-river-brazilian-amazon
#14
Isac Silva de Jesus, Milena Ferreira, Caroline Garcia, Leila Braga Ribeiro, José Antônio Alves-Gomes, Eliana Feldberg
Microsternarchus bilineatus is a neotropical electric fish species widely distributed in Amazonian ecosystems. This work reports the first karyotypic description of the species M. bilineatus, which presented 2n = 48 chromosomes, with a distinct karyotypic formula between the sexes: males with 21 metacentric (m)/submetacentric (sm) + 27 subtelocentric (st)/acrocentric (a) and fundamental number (FN) = 69 and females with 20 m/sm + 28 st/a and FN = 68. We found a probable recent sex system of XX/XY type...
December 2016: Zebrafish
https://www.readbyqxmd.com/read/27442252/a-ploidy-difference-represents-an-impassable-barrier-for-hybridisation-in-animals-is-there-an-exception-among-botiid-loaches-teleostei-botiidae
#15
Jörg Bohlen, Vendula Šlechtová, Vlastimil Šlechta, Vera Šlechtová, Alexandr Sember, Petr Ráb
One of the most efficient mechanisms to keep animal lineages separate is a difference in ploidy level (number of whole genome copies), since hybrid offspring from parents with different ploidy level are functionally sterile. In the freshwater fish family Botiidae, ploidy difference has been held responsible for the separation of its two subfamilies, the evolutionary tetraploid Botiinae and the diploid Leptobotiinae. Diploid and tetraploid species coexist in the upper Yangtze, the Pearl River and the Red River basins in China...
2016: PloS One
https://www.readbyqxmd.com/read/27430641/clusters-of-alpha-satellite-on-human-chromosome-21-are-dispersed-far-onto-the-short-arm-and-lack-ancient-layers
#16
William Ziccardi, Chongjian Zhao, Valery Shepelev, Lev Uralsky, Ivan Alexandrov, Tatyana Andreeva, Evgeny Rogaev, Christopher Bun, Emily Miller, Catherine Putonti, Jeffrey Doering
Human alpha satellite (AS) sequence domains that currently function as centromeres are typically flanked by layers of evolutionarily older AS that presumably represent the remnants of earlier primate centromeres. Studies on several human chromosomes reveal that these older AS arrays are arranged in an age gradient, with the oldest arrays farthest from the functional centromere and arrays progressively closer to the centromere being progressively younger. The organization of AS on human chromosome 21 (HC21) has not been well-characterized...
September 2016: Chromosome Research
https://www.readbyqxmd.com/read/27388621/the-nuclear-dna-content-and-genetic-diversity-of-lampetra-morii
#17
Xinyu Yan, Wenbin Meng, Fenfang Wu, Anlong Xu, Shangwu Chen, Shengfeng Huang
We investigated the nuclear DNA content and genetic diversity of a river lamprey, the Korean lamprey Lampetra morii, which is distributed in the northeast of China. L. morii spends its whole life cycle in fresh water, and its adult size is relatively small (~160 mm long) compared with that of other lampreys. The haploid nuclear DNA content of L. morii is 1.618 pg (approximately 1.582 Gb) in germline cells, and there is ~15% germline DNA loss in somatic cells. These values are significantly smaller than those of Petromyzon marinus, a lamprey with a published draft genome...
2016: PloS One
https://www.readbyqxmd.com/read/27382241/a-rare-balanced-nonrobertsonian-translocation-involving-acrocentric-chromosomes-chromosome-abnormality-of-t-13-15-p11-2-q22-1
#18
Dalvi Rupa, Koppaka Neeraja, Chavan Deepak, Mandava Swarna
BACKGROUND: Balanced non-robertsonian translocation (RT), involving acrocentric chromosomes, is a rare event and only a few cases are reported. Most of the RTs are balanced involving acrocentric chromosomes with the breakpoints (q10;q10). MATERIALS AND METHODS: Chromosome analysis was performed as per standard procedure - Giemsa-trypsin banding with 500 band resolution was analyzed for chromosome identification. RESULTS: In the present study, we report a rare balanced non-RTs involving chromosomes 13 and 15 with cytogenetic finding of 46, XX, t(13;15) (p11...
April 2016: Journal of Human Reproductive Sciences
https://www.readbyqxmd.com/read/27186337/sex-chromosome-diversity-in-armenian-toad-grasshoppers-orthoptera-acridoidea-pamphagidae
#19
Alexander G Bugrov, Ilyas E Jetybayev, Gayane H Karagyan, Nicolay B Rubtsov
Although previous cytogenetic analysis of Pamphagidae grasshoppers pointed to considerable karyotype uniformity among most of the species in the family, our study of species from Armenia has discovered other, previously unknown karyotypes, differing from the standard for Pamphagidae mainly in having unusual sets of sex chromosomes. Asiotmethis turritus (Fischer von Waldheim, 1833), Paranocaracris rubripes (Fischer von Waldheim, 1846), and Nocaracris cyanipes (Fischer von Waldheim, 1846) were found to have the karyotype 2n♂=16+neo-XY and 2n♀=16+neo-XX, the neo-X chromosome being the result of centromeric fusion of an ancient acrocentric X chromosome and a large acrocentric autosome...
2016: Comparative Cytogenetics
https://www.readbyqxmd.com/read/27115519/meiotic-recombination-analysis-in-female-ducks-anas-platyrhynchos
#20
M I Pigozzi, L Del Priore
Meiotic recombination in female ducks was directly studied by immunolocalization of MLH1 protein, a mismatch repair protein of mature recombination nodules. In total, 6820 crossovers were scored along the autosomal synaptonemal complexes in 122 meiotic nuclei. From this analysis we predict that the female map length of the duck is 2845 cM, with a genome wide recombination rate of 2 cM/Mb. MLH1-focus mapping along the six largest bivalents shows regional variations of recombination frequencies that can be linked to differences in chromosome morphology...
June 2016: Genetica
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