Tbx1 haploinsufficieny in the DiGeorge syndrome region causes aortic arch defects in mice

Nature. 2001 Mar 1;410(6824):97-101. doi: 10.1038/35065105.

Abstract

DiGeorge syndrome is characterized by cardiovascular, thymus and parathyroid defects and craniofacial anomalies, and is usually caused by a heterozygous deletion of chromosomal region 22q11.2 (del22q11) (ref. 1). A targeted, heterozygous deletion, named Df(16)1, encompassing around 1 megabase of the homologous region in mouse causes cardiovascular abnormalities characteristic of the human disease. Here we have used a combination of chromosome engineering and P1 artificial chromosome transgenesis to localize the haploinsufficient gene in the region, Tbx1. We show that Tbx1, a member of the T-box transcription factor family, is required for normal development of the pharyngeal arch arteries in a gene dosage-dependent manner. Deletion of one copy of Tbx1 affects the development of the fourth pharyngeal arch arteries, whereas homozygous mutation severely disrupts the pharyngeal arch artery system. Our data show that haploinsufficiency of Tbx1 is sufficient to generate at least one important component of the DiGeorge syndrome phenotype in mice, and demonstrate the suitability of the mouse for the genetic dissection of microdeletion syndromes.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Aorta, Thoracic / embryology
  • Aorta, Thoracic / pathology*
  • Cell Line
  • DiGeorge Syndrome / embryology
  • DiGeorge Syndrome / pathology*
  • Gene Deletion
  • Gene Targeting
  • Haplotypes
  • Humans
  • Mice
  • Mice, Inbred C57BL
  • Mice, Transgenic
  • Molecular Sequence Data
  • Mutagenesis
  • T-Box Domain Proteins / genetics*
  • T-Box Domain Proteins / physiology

Substances

  • T-Box Domain Proteins
  • TBX1 protein, human
  • Tbx1 protein, mouse

Associated data

  • GENBANK/AC003066
  • GENBANK/AC008019
  • GENBANK/AF326960