Evolutionary trends in animal ribosomal DNA loci: introduction to a new online database

Sochorová, Jana; Garcia, Sònia; Gálvez, Francisco; Symonová, Radka; Kovařı́k, Aleš

doi:10.1007/s00412-017-0651-8

Cited by 119 publications

(128 citation statements)

References 68 publications

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“…Its variation in size, among and within species, suggests polymorphism of the rDNA copy number. Natural polymorphism in the number of rDNA copies has been recorded in vertebrate and invertebrate animals, both among and within species [83]. Associations between the heterochromatin or rDNA variation and organismal phenotypes have also been demonstrated.…”

Section: Discussionmentioning

confidence: 97%

Structural Variation of the X Chromosome Heterochromatin in the Anopheles gambiae Complex

Sharma

Kinney

Timoshevskiy

et al. 2020

Genes

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Heterochromatin is identified as a potential factor driving diversification of species. To understand the magnitude of heterochromatin variation within the Anopheles gambiae complex of malaria mosquitoes, we analyzed metaphase chromosomes in An. arabiensis, An. coluzzii, An. gambiae, An. merus, and An. quadriannulatus. Using fluorescence in situ hybridization (FISH) with ribosomal DNA (rDNA), a highly repetitive fraction of DNA, and heterochromatic Bacterial Artificial Chromosome (BAC) clones, we established the correspondence of pericentric heterochromatin between the metaphase and polytene X chromosomes of An. gambiae. We then developed chromosome idiograms and demonstrated that the X chromosomes exhibit qualitative differences in their pattern of heterochromatic bands and position of satellite DNA (satDNA) repeats among the sibling species with postzygotic isolation, An. arabiensis, An. merus, An. quadriannulatus, and An. coluzzii or An. gambiae. The identified differences in the size and structure of the X chromosome heterochromatin point to a possible role of repetitive DNA in speciation of mosquitoes. We found that An. coluzzii and An. gambiae, incipient species with prezygotic isolation, share variations in the relative positions of the satDNA repeats and the proximal heterochromatin band on the X chromosomes. This previously unknown genetic polymorphism in malaria mosquitoes may be caused by a differential amplification of DNA repeats or an inversion in the sex chromosome heterochromatin.

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Section: Discussionmentioning

confidence: 97%

Structural Variation of the X Chromosome Heterochromatin in the Anopheles gambiae Complex

Sharma

Kinney

Timoshevskiy

et al. 2020

Genes

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“…[ 5 ] The peculiarity of subtelomeric gene content can also be exemplified by the fact that many species, including human, host ribosomal DNA arrays within subtelomeres. [ 33 ] The different gene content of the subtelomere might not be restricted to eukaryotes. For example, the subtelomeres of Streptomyces bacteria tend to be enriched in gene families involved in secondary metabolism relative to the core genome.…”

Section: Subtelomeres: Chromosome Domains Adjacent To Telomeres Sharementioning

confidence: 99%

Subtelomeres as Specialized Chromatin Domains

Hocher

Taddei

2020

BioEssays

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Specificities associated with chromosomal linearity are not restricted to telomeres. Here, recent results obtained on fission and budding yeast are summarized and an attempt is made to define subtelomeres using chromatin features extending beyond the heterochromatin emanating from telomeres. Subtelomeres, the chromosome domains adjacent to telomeres, differ from the rest of the genome by their gene content, rapid evolution, and chromatin features that together contribute to organism adaptation. However, current definitions of subtelomeres are generally based on synteny and are largely gene-centered. Taking into consideration both the peculiar gene content and dynamics as well as the chromatin properties of those domains, it is discussed how chromatin features can contribute to subtelomeric properties and functions, and play a pivotal role in the emergence of subtelomeres.

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“…2018; Sochorová et al, 2018;Perkins et al, 2019]. They also provide researchers with an overview of these studies, helping to identify gaps and the need for the application of new and complementary approaches.…”

mentioning

confidence: 99%

Introducing the Bird Chromosome Database: An Overview of Cytogenetic Studies in Birds

Degrandi

Barcellos

Costa

et al. 2020

Cytogenet Genome Res

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birdchromosomedatabase) we have compiled data on the chromosome numbers of 1,067 bird species and chromosome painting data on 96 species. We found considerable variation in the diploid numbers, which ranged from 40 to 142, although most (around 50%) of the species studied up to now have between 78 and 82 chromosomes. Despite its importance for cytogenetic research, chromosome painting has been applied to less than 1% of all bird species. The BCD will enable researchers to identify the main knowledge gaps in bird cytogenetics, including the most under-sampled groups, and make inferences on chromosomal homologies in phylogenetic studies. © 2020 S. Karger AG, BaselDatabases present a valuable source of information for research on a wide range of topics, including species inventories, cytogenetics of some key groups, chromosomal mapping of rDNA, and even complete genomic sequences [Peruzzi and Bedini, 2014;Jarvis et al., 2015;Cardoso et al., 2018;Gill and Donsker, 2018; Paresque et al., AbstractBird chromosomes, which have been investigated scientifically for more than a century, present a number of unique features. In general, bird karyotypes have a high diploid number (2n) of typically around 80 chromosomes that are divided into macro-and microchromosomes. In recent decades, FISH studies using whole chromosome painting probes have shown that the macrochromosomes evolved through both inter-and intrachromosomal rearrangements. However, chromosome painting data are available for only a few bird species, which hinders a more systematic approach to the understanding of the evolutionary history of the enigmatic bird karyotype. Thus, we decided to create an innovative database through compilation of the cytogenetic data available for birds, including chromosome numbers and the results of chromosome painting with chicken ( Gallus gallus ) probes. The data were obtained through an extensive literature review, which focused on cytogenetic studies published

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Evolutionary trends in animal ribosomal DNA loci: introduction to a new online database

Cited by 119 publications

References 68 publications

Structural Variation of the X Chromosome Heterochromatin in the Anopheles gambiae Complex

Structural Variation of the X Chromosome Heterochromatin in the Anopheles gambiae Complex

Subtelomeres as Specialized Chromatin Domains

Introducing the Bird Chromosome Database: An Overview of Cytogenetic Studies in Birds

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