Abstract:
:Missing teeth (hypodontia and oligodontia) are a common developmental abnormality in humans and heterozygous mutations of PAX9 have recently been shown to underlie a number of familial, non-syndromic cases. Whereas PAX9 haploinsufficiency has been suggested as the underlying genetic mechanism, it is not known how this affects tooth development. Here we describe a novel, hypomorphic Pax9 mutant allele (Pax9neo) producing decreased levels of Pax9 wild-type mRNA and show that this causes oligodontia in mice. Homozygous Pax9neo mutants (Pax9neo/neo) exhibit hypoplastic or missing lower incisors and third molars, and when combined with the null allele Pax9lacZ, the compound mutants (Pax9neo/lacZ) develop severe forms of oligodontia. The missing molars are arrested at different developmental stages and posterior molars are consistently arrested at an earlier stage, suggesting that a reduction of Pax9 gene dosage affects the dental field as a whole. In addition, hypomorphic Pax9 mutants show defects in enamel formation of the continuously growing incisors, whereas molars exhibit increased attrition and reparative dentin formation. Together, we conclude that changes of Pax9 expression levels have a direct consequence for mammalian dental patterning and that a minimal Pax9 gene dosage is required for normal morphogenesis and differentiation throughout tooth development.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Kist R,Watson M,Wang X,Cairns P,Miles C,Reid DJ,Peters Hdoi
10.1093/hmg/ddi388subject
Has Abstractpub_date
2005-12-01 00:00:00pages
3605-17issue
23eissn
0964-6906issn
1460-2083pii
ddi388journal_volume
14pub_type
杂志文章abstract::During postnatal development, neuronal activity controls the remodeling of initially imprecise neuronal connections through the regulation of gene expression. MeCP2 binds to methylated DNA and modulates gene expression during neuronal development and MECP2 mutation causes the autistic disorder Rett syndrome. To invest...
journal_title:Human molecular genetics
pub_type: 杂志文章
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journal_title:Human molecular genetics
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更新日期:2011-12-15 00:00:00
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journal_title:Human molecular genetics
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更新日期:2010-08-15 00:00:00
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更新日期:2001-10-01 00:00:00
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更新日期:2017-10-01 00:00:00
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journal_title:Human molecular genetics
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更新日期:2016-12-01 00:00:00
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pub_type: 杂志文章,meta分析
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更新日期:1996-05-01 00:00:00
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pub_type: 杂志文章,meta分析
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