Articles
- The Hand1 bHLH transcription
factor is essential for placentation and cardiac
morphogenesis.
Riley P, Anson-Cartwright L, Cross JC Nat Genet 1998 Mar
18:3 271-5
- Abstract The placenta and cardiovascular
system are the first organ systems to form during
mammalian embryogenesis. We show here that a single
gene is critical for development of both. The Hand1
gene, previously called Hxt, eHAND and Thing1, encodes
a basic helix-loop-helix (bHLH) transcription factor
that starts to be expressed during pre-implantation
development. After implantation, Hand1 expression is
restricted to placental trophoblast cells and later to
embryonic cardiac and neural crest cells. We generated
Hand1-null mutant mice by gene targetting. Homozygous
mutant embryos arrested by embryonic day (E) 7.5 of
gestation with defects in trophoblast giant cell
differentiation. This early mortality could be rescued
by aggregation of mutant embryos with wild-type
tetraploid embryos, which contribute wild-type cells
to the trophoblast, but not the embryo. By E10.5,
however, the Hand1-null fetuses derived from
tetraploid chimaeras died due to cardiac failure.
Their heart tubes showed abnormal looping and
ventricular myocardial differentiation. Therefore,
Hand1 is essential for differentiation of both
trophoblast and cardiomyocytes, which are
embryologically distinct cell lineages.
- A molecular pathway revealing a genetic basis for
human cardiac and craniofacial defects.
Science 1999 Feb 19;283(5405):1158-61 Yamagishi
H, Garg V, Matsuoka R, Thomas T, Srivastava D
- The allocation of epiblast cells to the embryonic
heart and other mesodermal lineages: the role of
ingression and tissue movement during gastrulation.
Development 124:1631-1642 (1997). Tam, P.P.L. et
al.
- Epiblast cells aquire a cardiogenic fate without
ingression through the primitive streak or movement
within the mesoderm. Allocation of epiblast cells to a
mesodermal lineage appears dependent upon the timing
of recruitment to the primitive streak. (Mouse)
- The effect of fetal lung inflation on fetal heart
rate. Am J Physiol 1994 Apr;266(4 Pt 2):H1395-400
Nail BS, Lumbers ER, Stevens AD School of Physiology and
Pharmacology, University of New South Wales, Sydney,
Australia. (Sheep)
- Development of the coronary
arteries in the embryonic human heart. Hutchins GM,
Kessler-Hanna A, Moore GW Circulation 1988
Jun;77(6):1250-7
- It is not known why the coronary arteries almost
always originate only from the right and left aortic
sinuses of Valsalva, since the structure and
conditions appear to be the same for all six sinuses
of the embryonic great arteries. We sought a possible
mechanical explanation for the phenomenon by studying
the development of the coronary vasculature in 351
staged, serially sectioned human embryos of Carnegie
stages 9 through 23 from the Carnegie Embryological
Collection. A plexus of blind epicardial capillaries
appears on the heart in Carnegie stage 14 or 15 and
acquires a coronary sinus connection in stage 15, 16,
or 17. The connection of the proximal coronary
arteries to the aorta does not appear until stage 18.
We found no histologic features of the cardiac nerves
or any other component of the tissues to account for
the consistent origin of coronary arteries from the
right and left aortic sinuses of Valsalva. However,
serial section reconstructions showed that the two
sinuses where coronary arteries develop acquire a
positive transverse curvature and a negative
longitudinal curvature, i.e., a catenoidal or
saddle-shaped configuration, before the appearance of
the coronary arteries. The four noncoronary sinuses
also have a positive transverse curvature, but
longitudinally, in contrast, they have a positive
curvature or are straight. The results suggest that
the coronary arteries originate from those sinuses of
Valsalva where wall tension is increased by a
catenoidal configuration. PMID: 3286038, UI:
88223706
Reviews
- Fashioning the vertebrate heart: earliest
embryonic decisions. Development 124:2099-2117
(1997) M.C. Fishman and M.C. Chien.
- Molecular pathways controlling heart development.
Science 1996 May 3;272(5262):671-6 Olson EN,
Srivastava D
- Heart development in Drosophila and vertebrates:
conservation of molecular mechanisms. Dev
Genet 1998;22(3):181-6 Bodmer R, Venkatesh TV
- Role of cardiac neural crest cells in
cardiovascular development. Annu Rev Physiol
1998;60:267-86 Creazzo TL, Godt RE, Leatherbury L, Conway
SJ, Kirby ML
- Homeobox genes in cardiovascular development.
Curr Top Dev Biol 1998;40:1-44 Patterson KD,
Cleaver O, Gerber WV, Grow MW, Newman CS, Krieg PA
Books
- Heart Development Richard P. Harvey and Nadia
Rosenthal, Eds. Academic, San Diego, 1999. 550 pp.
$US159.95. ISBN 0-12-329860-1. Richard P. Harvey and
Nadia Rosenthal, Eds.
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