Related Experiment Video
Updated: Jun 14, 2026

Single Nucleotide Polymorphism-sensitive FISH Detection of Locus-specific Ribosomal RNA Transcription in Drosophila melanogaster
Published on: March 28, 2025
Evolutionary relationships in the Drosophila ananassae species cluster based on introns of multiple nuclear loci
Kyoichi Sawamura1, Koichi Kamiya, Hajime Sato
1Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan. sawamura@biol.tsukuba.ac.jp
Abstract:
The Drosophila ananassae species cluster includes D. ananassae, D. pallidosa, D. parapallidosa, and the cryptic species "pallidosa-like", "pallidosa-like Wau" and "papuensis-like" Some of the taxa are sympatric in the South Pacific, Papua New Guinea, and Southeast Asia, and gene flow between different taxa has been suspected for a handful of genes. In the present analysis, we examined DNA sequences of introns in four loci: alpha actinin (Actn) on XL, white (w) on XR, CG7785 on 2L, and zinc ion transmembrane transporter 63C (ZnT63C) on 2R. Phylogenetic trees (neighbor-joining and haplotype network) were inconsistent among these loci. Some haplotypes shared between taxa were found for w, CG7785, and ZnT63C, suggesting recent gene flow. However, no haplotypes were shared, for example, between D. ananassae and D. pallidosa for CG7785, which is close to the proximal breakpoint of In(2L)D. This suggests that taxon-specific inversions prevent gene flow, as predicted by the chromosomal speciation hypothesis.
Related Concept Videos
Evolutionary Relationships through Genome Comparisons
Exon Recombination
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Gene Evolution - Fast or Slow?
In contrast, regions which code...
Synteny and Evolution
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...
Position-effect Variegation
Cis-regulatory Sequences

