Whole-exome resequencing reveals recessive mutations in TRAP1 in individuals with CAKUT and VACTERL association.

Abstract

Congenital abnormalities of the kidney and urinary tract (CAKUT) account for approximately half of children with chronic kidney disease and they are the most frequent cause of end-stage renal disease in children in the US. However, its genetic etiology remains mostly elusive. VACTERL association is a rare disorder that involves congenital abnormalities in multiple organs including the kidney and urinary tract in up to 60% of the cases. By homozygosity mapping and whole-exome resequencing combined with high-throughput mutation analysis by array-based multiplex PCR and next-generation sequencing, we identified recessive mutations in the gene TNF receptor-associated protein 1 (TRAP1) in two families with isolated CAKUT and three families with VACTERL association. TRAP1 is a heat-shock protein 90-related mitochondrial chaperone possibly involved in antiapoptotic and endoplasmic reticulum stress signaling. Trap1 is expressed in renal epithelia of developing mouse kidney E13.5 and in the kidney of adult rats, most prominently in proximal tubules and in thick medullary ascending limbs of Henle's loop. Thus, we identified mutations in TRAP1 as highly likely causing CAKUT or VACTERL association with CAKUT.

• Authors: Pawaree Saisawat, Stefan Kohl, Alina C Hilger, Daw-Yang Hwang, Heon Yung Gee, Gabriel C Dworschak, Velibor Tasic, Tracie Pennimpede, Sivakumar Natarajan, Ethan Sperry, Danilo S Matassa, Nataša Stajić, Radovan Bogdanovic, Ivo de Blaauw, Carlo L M Marcelis, Charlotte H W Wijers, Enrika Bartels, Eberhard Schmiedeke, Dominik Schmidt, Stefanie Märzheuser, Sabine Grasshoff-Derr, Stefan Holland-Cunz, Michael Ludwig, Markus M Nöthen, Markus Draaken, Erwin Brosens, Hugo Heij, Dick Tibboel, Bernhard G Herrmann, Benjamin D Solomon, Annelies de Klein, Iris A L M van Rooij, Franca Esposito, Heiko M Reutter, Friedhelm Hildebrandt
• Journal: Kidney international (Kidney Int) Vol. 85 Issue 6 Pg. 1310-7 (Jun 2014) ISSN: 1523-1755 [Electronic] United States
• PMID: 24152966 (Publication Type: Journal Article, Multicenter Study, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)

Chemical References

• HSP90 Heat-Shock Proteins
• TRAP-1 protein, mouse
• TRAP1 protein, human
• TRAP1 protein, rat

Topics

• Age Factors
• Anal Canal (abnormalities)
• Animals
• DNA Mutational Analysis (methods)
• Esophagus (abnormalities)
• Europe
• Exosomes
• Female
• Gene Expression Regulation, Developmental
• Genetic Predisposition to Disease
• Genetic Testing (methods)
• Gestational Age
• HSP90 Heat-Shock Proteins (genetics, metabolism)
• Heart Defects, Congenital (diagnosis, genetics)
• High-Throughput Nucleotide Sequencing
• Homozygote
• Humans
• Kidney (abnormalities, embryology, metabolism)
• Limb Deformities, Congenital (diagnosis, genetics)
• Male
• Mice
• Multiplex Polymerase Chain Reaction
• Mutation
• Pedigree
• Predictive Value of Tests
• Risk Factors
• Spine (abnormalities)
• Trachea (abnormalities)
• United States
• Urogenital Abnormalities
• Vesico-Ureteral Reflux (diagnosis, genetics)