Regressive evolution of the arthropod tritocerebral segment linked to functional divergence of the Hox gene labial
Regressive evolution of the arthropod tritocerebral segment linked to functional divergence of the Hox gene labial
复制标题
节肢动物三脑节的回归进化与Hox基因唇部的功能分化有关
DOI:
10.1098/rspb.2015.1162
复制
发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Prpic NM
中科院分区:
文献类型:
--
作者:
Pechmann M;Schwager EE;Turetzek N;Prpic NM
The intercalary segment is a limbless version of the tritocerebral segment and is present in the head of all insects, whereas other extant arthropods have retained limbs on their tritocerebral segment (e.g. the pedipalp limbs in spiders). The evolutionary origin of limb loss on the intercalary segment has puzzled zoologists for over a century. Here we show that an intercalary segment-like phenotype can be created in spiders by interfering with the function of the Hox genelabial. This links the origin of the intercalary segment to a functional change inlabial. We show that in the spiderParasteatoda tepidariorumthelabialgene has two functions: one function in head tissue maintenance that is conserved between spiders and insects, and a second function in pedipalp limb promotion and specification, which is only present in spiders. These results imply thatlabialwas originally crucial for limb formation on the tritocerebral segment, but that it has lost this particular subfunction in the insect ancestor, resulting in limb loss on the intercalary segment. Such loss of a subfunction is a way to avoid adverse pleiotropic effects normally associated with mutations in developmental genes, and may thus be a common mechanism to accelerate regressive evolution.
登录
查看更多内容
影响因子:
--
作者:
Nikola;M. Schoppmeier;W. Damen
通讯作者:
W. Damen
影响因子:
16.6
作者:
通讯作者:
--
影响因子:
2.7
作者:
Nico Posnien;Gregor Bucher
通讯作者:
Gregor Bucher
影响因子:
3.3
作者:
S. Klaus;J. C. Mendoza;J. H. Liew;M. Plath;R. Meier;D. Yeo
通讯作者:
D. Yeo
影响因子:
2.5
作者:
Nikola;W. Damen
通讯作者:
W. Damen