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CAKUT and Autonomic Dysfunction Caused by Acetylcholine Receptor Mutations

Research output: Contribution to journalArticle

  • Nina Mann
  • Franziska Kause
  • Erik K. Henze
  • Anant Gharpure
  • Shirlee Shril
  • Dervla M. Connaughton
  • Makiko Nakayama
  • Verena Klämbt
  • Amar J. Majmundar
  • Chen Han W. Wu
  • Caroline M. Kolvenbach
  • Rufeng Dai
  • Jing Chen
  • Amelie T. van der Ven
  • Hadas Ityel
  • Madeleine J. Tooley
  • Jameela A. Kari
  • Lucy Bownass
  • Sherif El Desoky
  • Elisa De Franco
  • Mohamed Shalaby
  • Velibor Tasic
  • Stuart B. Bauer
  • Richard S. Lee
  • Jonathan M. Beckel
  • Weiqun Yu
  • Shrikant M. Mane
  • Richard P. Lifton
  • Heiko Reutter
  • Sian Ellard
  • Ryan E. Hibbs
  • Toshimitsu Kawate
  • Friedhelm Hildebrandt
Original languageEnglish
Pages (from-to)1286-1293
Number of pages8
JournalAmerican Journal of Human Genetics
Volume105
Issue number6
Early online date7 Nov 2019
DOIs
DateE-pub ahead of print - 7 Nov 2019
DatePublished (current) - 5 Dec 2019

Abstract

Congenital anomalies of the kidney and urinary tract (CAKUT) are the most common cause of chronic kidney disease in the first three decades of life, and in utero obstruction to urine flow is a frequent cause of secondary upper urinary tract malformations. Here, using whole-exome sequencing, we identified three different biallelic mutations in CHRNA3, which encodes the α3 subunit of the nicotinic acetylcholine receptor, in five affected individuals from three unrelated families with functional lower urinary tract obstruction and secondary CAKUT. Four individuals from two families have additional dysautonomic features, including impaired pupillary light reflexes. Functional studies in vitro demonstrated that the mutant nicotinic acetylcholine receptors were unable to generate current following stimulation with acetylcholine. Moreover, the truncating mutations p.Thr337Asnfs81 and p.Ser340 led to impaired plasma membrane localization of CHRNA3. Although the importance of acetylcholine signaling in normal bladder function has been recognized, we demonstrate for the first time that mutations in CHRNA3 can cause bladder dysfunction, urinary tract malformations, and dysautonomia. These data point to a pathophysiologic sequence by which monogenic mutations in genes that regulate bladder innervation may secondarily cause CAKUT.

    Research areas

  • CAKUT, dysautonomia, genetics, kidney, neurogenic bladder

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