TBX1 Is Responsible for Cardiovascular Defects in Velo-Cardio-Facial/DiGeorge Syndrome
نویسندگان
چکیده
Velo-cardio-facial syndrome (VCFS)/DiGeorge syndrome (DGS) is a human disorder characterized by a number of phenotypic features including cardiovascular defects. Most VCFS/DGS patients are hemizygous for a 1.5-3.0 Mb region of 22q11. To investigate the etiology of this disorder, we used a cre-loxP strategy to generate mice that are hemizygous for a 1.5 Mb deletion corresponding to that on 22q11. These mice exhibit significant perinatal lethality and have conotruncal and parathyroid defects. The conotruncal defects can be partially rescued by a human BAC containing the TBX1 gene. Mice heterozygous for a null mutation in Tbx1 develop conotruncal defects. These results together with the expression patterns of Tbx1 suggest a major role for this gene in the molecular etiology of VCFS/DGS.
منابع مشابه
Mice overexpressing genes from the 22q11 region deleted in velo-cardio-facial syndrome/DiGeorge syndrome have middle and inner ear defects.
Velo-cardio-facial syndrome/DiGeorge syndrome (VCFS/DGS) is a congenital anomaly disorder associated with hemizygous 22q11 deletions. We previously showed that bacterial artificial chromosome (BAC) transgenic mice overexpressing four transgenes, PNUTL1, (CDCrel-1), GP1B beta, TBX1 and WDR14, had reduced viability, cardiovascular malformations and thymus gland hypoplasia. Since these are hallmar...
متن کاملFull spectrum of malformations in velo-cardio-facial syndrome/DiGeorge syndrome mouse models by altering Tbx1 dosage.
Velo-cardio-facial syndrome/DiGeorge syndrome (VCFS/DGS) is associated with de novo hemizygous 22q11.2 deletions and is characterized by malformations attributed to abnormal development of the pharyngeal arches and pouches. The main physical findings include aortic arch and outflow tract heart defects, thymus gland hypoplasia or aplasia and craniofacial anomalies. The disorder varies greatly in...
متن کامل22q11.2 Deletion Syndrome
In 1965 DiGeorge described a patient with hypoparathyroidism and cellular immune deficiency secondary to thymic hypoplasia. Soon the pattern of malformation included in this syndrome expanded to include other defects of third and fourth branchial arches as well as dysmorphic facial features. In 1978 Shprintzen reported a group of children with cleft palate or velopharyngeal incompetence, cardia...
متن کامل22q11.2 Deletion Syndrome
In 1965 DiGeorge described a patient with hypoparathyroidism and cellular immune deficiency secondary to thymic hypoplasia. Soon the pattern of malformation included in this syndrome expanded to include other defects of third and fourth branchial arches as well as dysmorphic facial features. In 1978 Shprintzen reported a group of children with cleft palate or velopharyngeal incompetence, cardia...
متن کاملInactivation of Tbx1 in the pharyngeal endoderm results in 22q11DS malformations.
The 22q11 deletion (22q11DS; velo-cardio-facial syndrome/DiGeorge syndrome) is characterized by defects in the derivatives of the pharyngeal apparatus. Mouse genetic studies have identified Tbx1, a member of the T-box family of transcription factors, as being responsible for the physical malformations of the syndrome. Mice heterozygous for a null mutation in Tbx1 have mild anomalies, whereas ho...
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ورودعنوان ژورنال:
- Cell
دوره 104 شماره
صفحات -
تاریخ انتشار 2001