Sonic hedgehog is not a limb morphogen but acts as a trigger to specify all digits in mice.
Sonic hedgehog is not a limb morphogen but acts as a trigger to specify all digits in mice.
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DOI:
10.1016/j.devcel.2022.07.016
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发表时间:
2022-09-12
影响因子:
11.8
通讯作者:
Mackem, Susan
中科院分区:
文献类型:
--
作者:
Zhu, Jianjian;Patel, Rashmi;Trofka, Anna;Harfe, Brian D.;Mackem, Susan
Limb patterning by Sonic hedgehog (Shh), via either graded spatial or temporal signal integration, is a paradigm for “morphogen” function. Yet how Shh instructs distinct digit identities remains controversial. Here, we bypassed the Shh-requirement in cell survival during outgrowth and demonstrate that a transient, early Shh pulse is both necessary and sufficient for normal mouse limb development. Shh-response is only short-range and limited to the Shh-expressing zone during this time window. Shh patterns digits 1–3, anterior to this zone, by an indirect mechanism, rather than direct spatial or temporal signal integration. Using a genetic relay-signaling assay, we discovered Shh also specifies digit 1/thumb (thought to be exclusively Shh-independent) indirectly, implicating Shh in a unique regulatory hierarchy for digit 1 evolutionary adaptations, such as opposable thumbs. This study illuminates Shh as a trigger for an indirect downstream network that becomes rapidly self-sustaining, with mechanistic relevance for limb development, regeneration, and evolution.
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DOI:
10.1073/pnas.1919470117
发表时间:
2020-01-14
影响因子:
11.1
作者:
Bastida, Maria Felix;Perez-Gomez, Rocio;Ros, Marian A.
通讯作者:
Ros, Marian A.
影响因子:
2.7
作者:
Chiang, C;Litingtung, Y;Fallon, JF
通讯作者:
Fallon, JF
影响因子:
4.6
作者:
Chen, YT;Knezevic, V;Mackem, S
通讯作者:
Mackem, S
影响因子:
56.9
作者:
Dahn, RD;Fallon, JF
通讯作者:
Fallon, JF
影响因子:
2.7
作者:
Lewandowski JP;Du F;Zhang S;Powell MB;Falkenstein KN;Ji H;Vokes SA
通讯作者:
Vokes SA