ArticleDevelopment (Cambridge, England)2025
Compensatory action of different types of cis-regulatory elements buffers the striped expression of Drosophila pair-rule genes.
Article in Development (Cambridge, England), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The striped expression of pair-rule genes in Drosophila embryos is a paradigm for understanding transcriptional control of development. Pair-rule striped expression is regulated by two types of cis-regulatory elements: stripe-specific elements respond to non-periodic cues in different regions of the embryo to establish individual stripes while 7-stripe elements simultaneously regulate all stripes, responding to pair-rule genes expressed in stripes. Here, we assess roles of stripe-specific versus 7-stripe elements for the pair-rule gene ftz. We show that loss of a ftz stripe 2 element is compensated by 7-stripe elements, even though they respond to different spatiotemporal cues. We next investigate whether similar rules apply to the classic eve stripe2 element. Animals homozygous for a genomic deletion of eve stripe2 are viable and fertile; stripe 2 expression is perturbed early but re-establishes sufficiently to regulate downstream target genes. However, temperature or genetic stress decrease viability of ftz and eve stripe 2 deletion mutants. Thus, these stripe-specific elements contribute to robustness but are not absolutely required for segment formation. Two separate routes to establishing stripes, stripe-specific and 7-stripe elements, buffer each other, adding complexity to embryonic patterning.
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