ArticleGenetics2026
Identification of a "new" crystal/Su(Ste) locus on the Drosophila melanogaster Y chromosome, resembling a piRNA cluster regulating Stellate repeats and transposons.
Article in Genetics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The crystal-Stellate interaction is the first known example of piRNA-mediated regulation between heterochromatin (the crystal/Suppressor of Stellate [Su(Ste)] locus on the Y chromosome) and euchromatin (the Stellate locus on the X chromosome) in Drosophila melanogaster. Here, we comprehensively annotate the Y-linked crystal/Su(Ste) sequences using Release 6 and heterochromatin-enriched scaffolds and contigs. In Release 6, we mapped 2 distinct crystal/Su(Ste) repeat regions with different molecular organizations. Beyond the ordered, tandem "classical" region, we identified a novel, disorganized region containing sequence fragments in both orientations derived from both crystal/Su(Ste) repeats and transposable elements. This disorganized locus displays structural features of a piRNA cluster that regulates both Stellate repeats and transposons. Furthermore, we identified at least 4 additional loci with organized crystal/Su(Ste)-like repeats within heterochromatin-enriched sequences not included in Release 6. We also conducted a detailed examination of the complex relationship between Release 6 sequences and more recent scaffolds and contigs. Alongside the classic crystal/Su(Ste) repeat containing hoppel/1360 fragments, we discovered 2 new repeat types structurally organized like crystal/Su(Ste) but carrying portions of HetA and gypsy12 transposons. Overall, these findings provide structural insights into the crystal-Stellate system, refining the Drosophila melanogaster Y chromosome map.
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