Distribution and molecular composition of heterochromatin in the holocentric chromosomes of the aphid Rhopalosiphum padi (Hemiptera: Aphididae).
In order to study the structure of holocentric chromosomes in aphids, the localization and the composition of Rhopalosiphum padi heterochromatin and rDNA genes have been evaluated at cytogenetic and molecular level. In particular, heterochromatin resulted located on all the chromosomes both in intercalary and telomeric positions. Moreover, enzymatic digestion of R. padi genome put in evidence a DraI satellite DNA which has been isolated, cloned and sequenced. FISH experiments showed that this satellite DNA clusters in an intercalary C-positive band on the two X chromosomes.
Monti
Valentina
V
Dipartimento di Biologia, Università di Modena e Reggio Emilia, Via Campi 213/D, 41125 Modena, Italy.
Manicardi
Gian Carlo
GC
Mandrioli
Mauro
M
D000818:Animals; D001042:Aphids / Q000235:genetics*; D001483:Base Sequence; D003582:Cytogenetics; D004275:DNA, Ribosomal / Q000032:analysis / Q000235:genetics; D004276:DNA, Satellite / Q000378:metabolism; D005260:Female; D006570:Heterochromatin / Q000737:chemistry*; D017404:In Situ Hybridization, Fluorescence; D008969:Molecular Sequence Data; D016415:Sequence Alignment; D014960:X Chromosome
D004275:DNA, Ribosomal; D004276:DNA, Satellite; D006570:Heterochromatin