期刊
DEVELOPMENTAL BIOLOGY
卷 382, 期 2, 页码 470-481出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ydbio.2013.07.025
关键词
Hand1; Basic helix-loop-helix; Transcription factor; Homodimer; Mouse development; Trophoblast
资金
- Canadian Institutes of Health Research Funding Source: Medline
Hand1 is a basic helix-loop-helix transcription factor that is essential for development of the placenta, yolk sac and heart during mouse development. While Hand1 is essential for trophoblast giant cell (TGC) differentiation, its potential heterodimer partners are not co-expressed in TGCs. To test the hypothesis that Hand1 functions as homodimer, we generated knock-in mice in which the Hand1 gene was altered to encode a tethered homodimer (TM). Some Hand 1m/- conceptuses in which the only form of Hand1 is Hand1 TH are viable and fertile, indicating that homodimer Hand1 is sufficient for mouse survival. --2/3 of Hand1mi- and all Hand1THMI mice died in utero and displayed severe placental defects and variable cardial and cranial-facial abnormalities, indicating a dosage-dependent effect of Hand1m Meanwhile, expression of the Hand1TH protein did not have negative effects on viability or fertility in all Hand1mh mice. These data imply that Hand1 homodimer plays a dominant role during development and its expression dosage is critical for survival, whereas Hand1 heterodimers can be either dispensable or play a regulatory role to modulate the activity of Hand1 homodimer in vivo. 0 2013 Elsevier Inc. All rights reserved.
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