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2018 ; 9
(ä): 17
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Expression of NK cluster genes in the onychophoran Euperipatoides rowelli:
implications for the evolution of NK family genes in nephrozoans
#MMPMID30026904
Treffkorn S
; Kahnke L
; Hering L
; Mayer G
Evodevo
2018[]; 9
(ä): 17
PMID30026904
show ga
BACKGROUND: Understanding the evolution and development of morphological traits
of the last common bilaterian ancestor is a major goal of the evo-devo
discipline. The reconstruction of this "urbilaterian" is mainly based on
comparative studies of common molecular patterning mechanisms in recent model
organisms. The NK homeobox genes are key players in many of these molecular
pathways, including processes regulating mesoderm, heart and neural development.
Shared features seen in the expression patterns of NK genes have been used to
determine the ancestral bilaterian characters. However, the commonly used model
organisms provide only a limited view on the evolution of these molecular
pathways. To further investigate the ancestral roles of NK cluster genes, we
analyzed their expression patterns in the onychophoran Euperipatoides rowelli.
RESULTS: We identified nine transcripts of NK cluster genes in E. rowelli,
including single copies of NK1, NK3, NK4, NK5, Msx, Lbx and Tlx, and two copies
of NK6. All of these genes except for NK6.1 and NK6.2 are expressed in different
mesodermal organs and tissues in embryos of E. rowelli, including the anlagen of
somatic musculature and the heart. Furthermore, we found distinct expression
patterns of NK3, NK5, NK6, Lbx and Msx in the developing nervous system. The same
holds true for the NKL gene NK2.2, which does not belong to the NK cluster but is
a related gene playing a role in neural patterning. Surprisingly, NK1, Msx and
Lbx are additionally expressed in a segment polarity-like pattern early in
development-a feature that has been otherwise reported only from annelids.
CONCLUSION: Our results indicate that the NK cluster genes were involved in
mesoderm and neural development in the last common ancestor of bilaterians or at
least nephrozoans (i.e., bilaterians to the exclusion of xenacoelomorphs). By
comparing our data from an onychophoran to those from other bilaterians, we
critically review the hypothesis of a complex "urbilaterian" with a segmented
body, a pulsatile organ or heart, and a condensed mediolaterally patterned nerve
cord.