Modulation of transcription burst amplitude underpins dosage compensation in the Drosophila embryo.
Cell Rep
; 42(4): 112382, 2023 04 25.
Article
in En
| MEDLINE
| ID: mdl-37060568
ABSTRACT
Dosage compensation, the balancing of X-linked gene expression between sexes and to the autosomes, is critical to an organism's fitness and survival. In Drosophila, dosage compensation involves hypertranscription of the male X chromosome. Here, we use quantitative live imaging and modeling at single-cell resolution to study X chromosome dosage compensation in Drosophila. We show that the four X chromosome genes studied undergo transcriptional bursting in male and female embryos. Mechanistically, our data reveal that transcriptional upregulation of male X chromosome genes is primarily mediated by a higher RNA polymerase II initiation rate and burst amplitude across the expression domain. In contrast, burst frequency is spatially modulated in nuclei within the expression domain in response to different transcription factor concentrations to tune the transcriptional response. Together, these data show how the local and global regulation of distinct burst parameters can establish the complex transcriptional outputs underpinning developmental patterning.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Drosophila Proteins
/
Drosophila
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Cell Rep
Year:
2023
Document type:
Article