Jason Z Stoller | PubMed Health

PubMed2005

Cardiac neural crest.

Neural crest cells (NCCs) contribute to many organs and tissues during embryonic development. Amongst these, the cardiovascular system represents a fascinating example. In this review, recent advances in our understanding of the developmental biology and molecular genetics regulating cardiac NCC maturation will be summarized. While the existence of a significant neural crest (NC) contribution to the developing heart has been appreciated for more than 20 years, only in the last few years have molecular pathways regulating this process been elucidated and the significant contribution of these mechanisms to the etiology of congenital heart disease in man become apparent. Emerging data suggest that ongoing studies will reveal complex inductive interactions between cardiac NC and a series of other cell types contributing to the developing cardiovascular system.

Animals↗

PubMed2005

Identification of a novel nuclear localization signal in Tbx1 that is deleted in DiGeorge syndrome patients harboring the 1223delC mutation.

DiGeorge syndrome (DGS) is the most common human chromosomal deletion syndrome and is frequently associated with deletions on chromosome 22q11. Approximately 17% of patients with the phenotypic features of this syndrome have no detectable genomic deletion. Animal studies using mouse models have implicated Tbx1 as a critical gene within the commonly deleted region, and several mutations in TBX1 have been identified recently in non-deleted patients, including missense and frameshift mutations. The mechanisms by which these mutations cause disease have remained unclear. We have identified a previously unrecognized and novel nuclear localization signal (NLS) at the C-terminus of Tbx1 that is deleted by the 1223delC mutation, thus explaining the mechanism of disease in these patients. This NLS is conserved across species, among a subfamily of T-box proteins including Brachyury and Tbx10, and among additional nuclear proteins. By providing functional data to indicate loss-of-function produced by the 1223delC TBX1 mutation, our results provide strong support for the conclusion that TBX1 mutations can cause DGS in humans.

Amino Acid Motifs↗