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Evolutionary history of the extant amphioxus lineage with shallow-branching diversification

, 6061 Aitsu, Kami-Amakusa, Kumamoto, 861-6102, JapanYasuhisa Henmi AuthorsSearch for Takeshi Igawa in:Nature Research journals • PubMed • Google Scholar Search for Masafumi Nozawa in:Nature Research

Different Endosymbiotic Interactions in Two Hydra Species Reflect the Evolutionary History of Endosymbiosis

Endosymbiosis is an important evolutionary event for organisms, and there is widespread interest in understanding the evolution of endosymbiosis establishment. Hydra is one of the most suitable organisms for studying the evolution of endosymbiosis. Within the genus Hydra, H. viridissima and H. vulgaris show endosymbiosis with green algae. Previous studies suggested that the...

Evolutionary Transitions of MicroRNA-Target Pairs

How newly generated microRNA (miRNA) genes are integrated into gene regulatory networks during evolution is fundamental in understanding the molecular and evolutionary bases of robustness and plasticity in gene regulation. A recent model proposed that after the birth of a miRNA, the miRNA is generally integrated into the network by decreasing the number of target genes during...

Tissue- and Stage-Dependent Dosage Compensation on the Neo-X Chromosome in Drosophila pseudoobscura

Sex chromosome dosage compensation (DC) is widely accepted in various organisms. This concept is mostly supported by comparisons of gene expression between chromosomes and between sexes. However, genes on the X chromosome and autosomes are mostly not homologous, and the average gene expression level on these chromosomes may not be the same even under DC, which complicates...

Experimental Approach Reveals the Role of alx1 in the Evolution of the Echinoderm Larval Skeleton

Over the course of evolution, the acquisition of novel structures has ultimately led to wide variation in morphology among extant multicellular organisms. Thus, the origins of genetic systems for new morphological structures are a subject of great interest in evolutionary biology. The larval skeleton is a novel structure acquired in some echinoderm lineages via the activation of...

Origins and Evolution of MicroRNA Genes in Plant Species

MicroRNAs (miRNAs) are among the most important regulatory elements of gene expression in animals and plants. However, their origin and evolutionary dynamics have not been studied systematically. In this paper, we identified putative miRNA genes in 11 plant species using the bioinformatic technique and examined their evolutionary changes. Our homology search indicated that no...

Roles of Mutation and Selection in Speciation: From Hugo de Vries to the Modern Genomic Era

Masatoshi Nei 0 Masafumi Nozawa 0 0 Institute of Molecular Evolutionary Genetics and Department of Biology, Pennsylvania State University One of the most important problems in evolutionary biology

Evolutionary Changes of the Target Sites of Two MicroRNAs Encoded in the Hox Gene Cluster of Drosophila and Other Insect Species

Sayaka Miura 0 Masafumi Nozawa 0 Masatoshi Nei 0 0 Institute of Molecular Evolutionary Genetics, Department of Biology, Pennsylvania State University MicroRNAs (miRs) are noncoding RNAs that

Unusual Evolution of Interspersed Repeat Sequences in the Drosophila ananassae Subgroup

New repeat sequences were found in the Drosophila ananassae genome sequence. They accounted for approximately 1.2% of the D. ananassae genome and were estimated to be more abundant in genomes of its closely related species belonging to the Drosophila bipectinata complex, whereas it was entirely absent in the Drosophila melanogaster genome. They were interspersed throughout...

The draft genomes of soft-shell turtle and green sea turtle yield insights into the development and evolution of the turtle-specific body plan

Masafumi Nozawa in:Nature Research journals • PubMed • Google ScholarSearch for Qiye Li in:Nature Research journals • PubMed • Google ScholarSearch for Juan Wang in:Nature Research journals • PubMed • Google