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28 March 2024
 
  » pubmed » pmid10385121

 Article overview


The SIL gene is required for mouse embryonic axial development and left-right specification
S Izraeli ; L A Lowe ; V L Bertness ; D J Good ; D W Dorward ; I R Kirsch ; M R Kuehn ;
Date 17 Jun 1999
Journal Nature, 399 (6737), 691-4
AbstractThe establishment of the main body axis and the determination of left-right asymmetry are fundamental aspects of vertebrate embryonic development. A link between these processes has been revealed by the frequent finding of midline defects in humans with left-right anomalies. This association is also seen in a number of mutations in mouse and zebrafish, and in experimentally manipulated Xenopus embryos. However, the severity of laterality defects accompanying abnormal midline development varies, and the molecular basis for this variation is unknown. Here we show that mouse embryos lacking the early-response gene SIL have axial midline defects, a block in midline Sonic hedgehog (Shh) signalling and randomized cardiac looping. Comparison with Shh mutant embryos, which have axial defects but normal cardiac looping, indicates that the consequences of abnormal midline development for left-right patterning depend on the time of onset, duration and severity of disruption of the normal asymmetric patterns of expression of nodal, lefty-2 and Pitx2.
Source PubMed, pmid10385121 doi: 10.1038/21429
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