Interrelationship between the states of chromosome compaction, replication and transcription patterns in the polytene-X chromosome ofDrosophila melanogaster View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1990-09

AUTHORS

D Mutsuddi, Mausumi Mutsuddi (Nee Das), A K Duttagupta

ABSTRACT

We studied by autoradiography the replication and transcription patterns of polytene X chromosomes in different segmental aneuploid and hyperploid conditions in a constant diploid autosomal background. In all karyotypes, the patterns of X chromosome compaction and DNA synthesis were observed to be set strictly either at a “male-level” or a “female-level”. Addition of X-fragments to 1X progeny exceeding a certain limit (62% with proximal duplication) changed the pattern of chromatin compaction and replication of X chromosomes from male to female level, while similar additional X-fragments had no comparable effect on 2X hyperdiploids. In contrast, different levels of X-transcription per segment were observed in these aneuploids with variable X-load and in consequence, an equivalent amount of total X-transcription (relative to autosomal transcription) was visualized. These findings while favour a positive correlation between the state of chromosome compaction and replication patterns, are at odds with the idea that for an altered level of transcription, a modulation in the state of chromosome compaction and replication is an obligatory pre-requisite. More... »

PAGES

377-386

Journal

TITLE

Proceedings: Animal Sciences

ISSUE

5

VOLUME

99

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf03191870

DOI

http://dx.doi.org/10.1007/bf03191870

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1011638181


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