Project description:Meiosis is generally a fair process: each chromosome has a 50% chance of being included into each gamete. However, meiosis can become aberrant with some chromosomes having a higher chance of making it into gametes than others. Yet, why and how such systems evolve remains unclear. Here, we study the unusual reproductive genetics of mealybugs, where only maternal-origin chromosomes are included in gametes during male meiosis, while paternal chromosomes are eliminated. One species-Pseudococcus viburni-has a segregating B chromosome that drives by escaping paternal genome elimination. We present whole genome and gene expression data from lines with and without B chromosomes. We identify B-linked sequences including 204 protein-coding genes and a satellite repeat that makes up a significant proportion of the chromosome. The few paralogs between the B and the core genome are distributed throughout the genome, arguing against a simple, or at least recent, chromosomal duplication of one of the autosomes to create the B. We do, however, find one 373 kb region containing 146 genes that appears to be a recent translocation. Finally, we show that while many B-linked genes are expressed during meiosis, most of these are encoded on the recently translocated region. Only a small number of B-exclusive genes are expressed during meiosis. Of these, only one was overexpressed during male meiosis, which is when the drive occurs: an acetyltransferase involved in H3K56Ac, which has a putative role in meiosis and is, therefore, a promising candidate for further studies.

| S-EPMC11776215 | biostudies-literature

Global Potential Distribution of Invasive Species <i>Pseudococcus viburni</i> (Hemiptera: Pseudococcidae) under Climate Change.

Project description:The potential distribution range and management strategies for P. viburni are poorly understood. Based on historical distribution data and environmental factors, the present study predicted the potentially suitable areas for P. viburni spread under different climate change scenarios using MaxEnt (maximum entropy). The results showed that precipitation of the coldest quarter (Bio19), precipitation seasonality (Bio15), and mean temperature of the wettest quarter (Bio8) were the most important environmental factors determining the distribution of P. viburni. Under the current climate conditions, its potential suitable areas are southern China, the whole of Japan, North America (especially the eastern part of the United States), the southwestern part of South America, the Mediterranean coast and most of Europe, the central part of Africa, i.e., the south of the Sahara Desert, and most of the southern coast of Australia. The total area of habitats suitable for this insect pest is predicted to be increased in the future. In order to prevent P. viburni transmission and spread, there is a need to strengthen the monitoring and quarantine measures against this pest at the Southern ports.

| S-EPMC10971524 | biostudies-literature

B chromosomes in Pseudococcus viburni

Project description:Analysis of a selfish chromosome in a scale insect

| PRJEB47083 | ENA

ihPseVibu

Project description:Pseudococcus viburni (obscure mealybug), genomic and transcriptomic data

| PRJEB69493 | ENA

Pseudomonas syringae pv. viburni strain:CFBP 1702

Project description:Pseudomonas syringae pv. viburni strain:CFBP 1702 Genome sequencing and assembly

| PRJNA274690 | ENA

ihPseVibu3.Tremblaya_sp_1

Project description:Candidatus Tremblaya endosymbiont of Pseudococcus viburni genome assembly, ihPseVibu3.Tremblaya_sp_1