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© Research
Publication : Developmental cell

Drosophila left/right asymmetry establishment is controlled by the Hox gene abdominal-B

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Developmental cell - 14 Jan 2013

Coutelis JB, Géminard C, Spéder P, Suzanne M, Petzoldt AG, Noselli S

Link to Pubmed [PMID] – 23328400

Dev. Cell 2013 Jan;24(1):89-97

In Drosophila, left/right (LR) asymmetry is apparent in the directional looping of the gut and male genitalia. The dextral orientation of the organs depends on the activity of a single gene, MyosinID (myoID), whose mutation leads to a fully inverted LR axis, thus revealing the activity of a recessive sinistral pathway. Here, we present the identification of the Hox gene Abdominal-B (Abd-B) as an upstream regulator of LR determination. This role appears distinct from its function in anteroposterior patterning. We show that the Abd-Bm isoform binds to regulatory sequences of myoID and controls MyoID expression in the organ LR organizer. Abd-Bm is also required for the sinistral pathway. Thus, when Abd-B activity is missing, no symmetry breaking occurs and flies develop symmetrically. These findings identify the Hox gene Abd-B as directing the earliest events of LR asymmetry establishment in Drosophila.

http://www.ncbi.nlm.nih.gov/pubmed/23328400