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Early Distal‐less expression in a developing crustacean limb bud becomes restricted to setal‐forming cells
Author(s) -
Williams Terri A.
Publication year - 2008
Publication title -
evolution and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.651
H-Index - 78
eISSN - 1525-142X
pISSN - 1520-541X
DOI - 10.1111/j.1525-142x.2007.00218.x
Subject(s) - biology , limb development , limb bud , anatomy , juvenile , microbiology and biotechnology , crustacean , zoology , genetics , embryo
SUMMARY Distal‐less ( Dll ) plays a well‐known role in patterning the distal limb in arthropods. However, in some taxa, its expression even during early limb development is not always limited to the distal limb. Here, I trace the expression of Distal‐less in a crustacean ( Thamnocephalus platyurus ) from the early limb bud to later stages of limb development, a period that includes differentiation of juvenile and adult morphology. During early development, I find two distinct types of DLL expression: one correlated with proximal distal leg patterning and the other restricted to setal‐forming cells. Later in development, all the DLL expression is restricted to setal‐forming cells. Based on the particular cells expressing DLL, I hypothesize an ancestral role for Dll function in the formation accessory cells of sensilla.