Position-effect variegation in Drosophila melanogaster X chromosome inversion with a breakpoint in a satellite block and its suppression in a secondary rearrangement.
Chromosoma
; 106(8): 520-5, 1997 Dec.
Article
en En
| MEDLINE
| ID: mdl-9426284
ABSTRACT
In(1LR)pn2a is a pericentric inversion with a euchromatic breakpoint in the 2E polytene region and a heterochromatic breakpoint in the right arm of the X chromosome. It is associated with position-effect variegation (PEV) of the pn, wapl, Pgd and other vital loci of the 2E region, which are relocated near the bulk of the X heterochromatin. Cytological analysis showed that the rearrangement brings the 1A-2E euchromatic segment directly into contact with a major portion of the h34 block, a heterochromatic region that is positively stained by the N-banding technique and contains the AAGAG satellite sequences. Molecular cloning revealed the presence of a new junction between euchromatin and AAGAG satellite sequences and demonstrated that the euchromatic breakpoint of In(1LR)pn2a lies in the vinculin gene. In the X ray-induced secondary rearrangement In(1LR)r30, consisting of a pericentric inversion superimposed on In(1LR)pn2a, the h34 material remains associated with the 2E region but is separated from the rest of the X heterochromatin. In this case, the pn, wapl and Pgd loci no longer variegate, suggesting that the satellite-containing h34 region is not able per se to induce detectable PEV on the adjacent euchromatic genes.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Supresión Genética
/
Cromosoma X
/
ADN Satélite
/
Rotura Cromosómica
/
Drosophila melanogaster
/
Inversión Cromosómica
Límite:
Animals
Idioma:
En
Revista:
Chromosoma
Año:
1997
Tipo del documento:
Article
País de afiliación:
Rusia