title: Ultrastructure of E1 + 2 + 9 + 12 inversion breakpoints in Drosophila subobscura.
abstract: The ultrastructure of the Drosophila subobscura chromosome regions around the breakpoints of the complex E1 + 2 + 9 + 12 gene arrangement was analyzed. This overlapping inversion is formed by the association of the E1, E2, E9, and E12 simple inversions. Ultrastructure of sections involving 58D/59A, 61C/D, 62D/63A, 64B/C, 67A/B, and 68B/C breakpoints on Est chromosomes were compared with the ultrastructure of sections involving chromosomes were compared with the ultrastructure of sections involving 58D/68B, 62D/64C, 59A/63A, 64B/68C, 67B/61C, and 67A/61B breakpoints on E1 + 2 + 9 + 12 chromosomes. No detectable changes of structural organization on banding patterns induced by the E1 + 2 + 9 + 12 inversion were found. Ultrastructural analysis of the two E12 breakpoints has, however, facilitated the analysis of the left boundary of E12 inversion. Accordingly, we propose 61B/C as a new breakpoint instead of 61C/D.
authors.affiliation: Departamento de Genética, Facultad de Ciencias Biológicas, Valencia, Spain.
authors.forename: J B
authors.initials: JB
authors.lastname: Cuenca
authors.forename: A O
authors.initials: AO
authors.lastname: Saura
authors.forename: V
authors.initials: V
authors.lastname: Sorsa
authors.forename: R
authors.initials: R
authors.lastname: de Frutos
mesh_terms: D000818:Animals; D002871:Chromosome Banding; D002875:Chromosomes / Q000648:ultrastructure*; D004330:Drosophila / Q000235:genetics* / Q000648:ultrastructure; D008854:Microscopy, Electron