Notochord signals control the transcriptional cascade of myogenic bHLH genes in somites of quail embryos.
Notochord signals control the transcriptional cascade of myogenic bHLH genes in somites of quail embryos.
复制标题
脊索信号控制鹌鹑胚胎体节中生肌 bHLH 基因的转录级联。
作者:
M. Pownall;Karen E. Strunk;C. Emerson
Microsurgical, tissue grafting and in situ hybridization techniques have been used to investigate the role of the neural tube and notochord in the control of the myogenic bHLH genes, QmyoD, Qmyf5, Qmyogenin and the cardiac alpha-actin gene, during somite formation in stage 12 quail embryos. Our results reveal that signals from the axial neural tube/notochord complex control both the activation and the maintenance of expression of QmyoD and Qmyf5 in myotomal progenitor cells during the period immediately following somite formation and prior to myotome differentiation. QmyoD and Qmyf5 expression becomes independent of axial signals during myotome differentiation when somites activate expression of Qmyogenin and alpha-actin. Ablation studies reveal that the notochord controls QmyoD activation and the initiation of the transcriptional cascade of myogenic bHLH genes as epithelial somites condense from segmental plate mesoderm. The dorsal medial neural tube then contributes to the maintenance of myogenic bHLH gene expression in newly formed somites. Notochord grafts can activate ectopic QmyoD expression during somite formation, establishing that the notochord is a necessary and sufficient source of diffusible signals to initiate QmyoD expression. Myogenic bHLH gene expression is localized to dorsal medial cells of the somite by inhibitory signals produced by the lateral plate and ventral neural tube. Signaling models for the activation and maintenance of myogenic gene expression and the determination of myotomal muscle in somites are discussed.
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DOI:
10.1242/dev.120.6.1443
发表时间:
1994
期刊:
Development (Cambridge, England)
影响因子:
--
作者:
Buffinger,N;Stockdale,FE
通讯作者:
Stockdale,FE
影响因子:
10.5
作者:
MUNSTERBERG, AE;KITAJEWSKI, J;LASSAR, AB
通讯作者:
LASSAR, AB
DOI:
10.1006/dbio.1995.1130
发表时间:
1995
期刊:
Developmental biology.
影响因子:
--
作者:
Buffinger,N;Stockdale,FE
通讯作者:
Stockdale,FE
DOI:
10.1242/dev.120.4.957
发表时间:
1994
期刊:
Development (Cambridge, England)
影响因子:
--
作者:
Goulding,M;Lumsden,A;Paquette,AJ
通讯作者:
Paquette,AJ
DOI:
10.1006/dbio.1995.1192
发表时间:
1995
期刊:
Developmental biology.
影响因子:
--
作者:
Pinney,DF;delaBrousse,FC;Faerman,A;Shani,M;Maruyama,K;EmersonJr,CP
通讯作者:
EmersonJr,CP