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Location and expression of ribosomal RNA genes in grasshoppers: Abundance of silent and cryptic loci
TLDR
The abundance of silent and cryptic loci might suggest that rDNA spreads through grasshopper genomes by the Dubcovsky and Dvorak mechanism—that is, the transposition of a few rRNA genes to new chromosome locations, their amplification giving rise to new NORs, and the elimination of the old NORs. Expand
POLYMORPHISM REGENERATION FOR A NEUTRALIZED SELFISH B CHROMOSOME
TLDR
The first empirical evidence for the substitution of a neutralized B variant by a new selfish B variant has recently taken place in a natural population of the grasshopper Eyprepocnemis plorans. Expand
Meiotic behaviour of the holocentric chromosomes of Nezara viridula (Insecta, Heteroptera) analysed by C-banding and silver impregnation
TLDR
From cytological analysis, it is deduced that centromeric activity is preferentially located at the two telomeric ends and that the presence of chiasmata at an end excludes such activity. Expand
High-throughput analysis of the satellitome illuminates satellite DNA evolution
TLDR
The high-throughput analysis of satellite DNA content in the migratory locust by means of the bioinformatic analysis of Illumina reads with the RepeatExplorer and RepeatMasker programs is shown and the term “satellitome” is proposed for the whole collection of different satDNA families in a genome. Expand
Population Dynamics of A Selfish B Chromosome Neutralized by the Standard Genome in the Grasshopper Eyprepocnemis Plorans
TLDR
Effects of the B chromosome polymorphism of the grasshopper Eyprepocnemis plorans were analyzed in two natural populations and suggested that the mean time to extinction is proportional to the two‐thirds power of the population size; it is much less affected by subpopulation size or the number of populations in a subdivided population. Expand
Chromosome mapping of H3 and H4 histone gene clusters in 35 species of acridid grasshoppers
TLDR
Chromosome location of H3-H4 histone gene clusters seem to be highly conservative in Acrididae grasshoppers, which is most parsimoniously explained by common ancestry. Expand
B chromosome ancestry revealed by histone genes in the migratory locust
TLDR
Strong evidence for B chromosome ancestry in the migratory locust is provided, based on the location of genes for the H3 and H4 histones in the B chromosome and a single A chromosome pair, showing the B-chromosome ability to persist in natural populations for long periods of time. Expand
Evolutionary dynamics of 5S rDNA location in acridid grasshoppers and its relationship with H3 histone gene and 45S rDNA location
TLDR
There was extensive variation among species for the number and location of 5S rDNA sites, and possible mechanisms of spread that led to the extensive variation in the number of clusters observed for both rDNA types in acridid grasshoppers are discussed. Expand
A WIDESPREAD B CHROMOSOME POLYMORPHISM MAINTAINED WITHOUT APPARENT DRIVE
TLDR
It is concluded that Bs are inherited in a random manner with no tendency toward accumulation or loss from either sex and the possible factors that might be responsible for this widespread polymorphism are discussed. Expand
Common origin of B chromosome variants in the grasshopper Eyprepocnemis plorans
Nine B chromosome variants, from seven different populations of Eyprepocnemis plorans collected at four localities in Spain and three in Morocco, have been shown to be mainly composed of two DNAExpand
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