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Mutations in ATP1A1 Cause Dominant Charcot-Marie-Tooth Type 2

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Presentation on theme: "Mutations in ATP1A1 Cause Dominant Charcot-Marie-Tooth Type 2"— Presentation transcript:

1 Mutations in ATP1A1 Cause Dominant Charcot-Marie-Tooth Type 2
Petra Lassuthova, Adriana P. Rebelo, Gianina Ravenscroft, Phillipa J. Lamont, Mark R. Davis, Fiore Manganelli, Shawna M. Feely, Chelsea Bacon, Dana Šafka Brožková, Jana Haberlova, Radim Mazanec, Feifei Tao, Cima Saghira, Lisa Abreu, Steve Courel, Eric Powell, Elena Buglo, Dana M. Bis, Megan F. Baxter, Royston W. Ong, Lorna Marns, Yi-Chung Lee, Yunhong Bai, Daniel G. Isom, René Barro-Soria, Ki W. Chung, Steven S. Scherer, H. Peter Larsson, Nigel G. Laing, Byung-Ok Choi, Pavel Seeman, Michael E. Shy, Lucio Santoro, Stephan Zuchner  The American Journal of Human Genetics  Volume 102, Issue 3, Pages (March 2018) DOI: /j.ajhg Copyright © 2018 American Society of Human Genetics Terms and Conditions

2 Figure 1 Pedigrees of Families Carrying Mutations in ATP1A1
Autosomal-dominant CMT-affected families show segregation of ATP1A1 variants: family 1 (Czech Republic), family 2 (Italy), family 3 (USA1), family 4 (USA2), family 5 (Australia1), family 6 (Australia2), and family 7 (Korea). The American Journal of Human Genetics  , DOI: ( /j.ajhg ) Copyright © 2018 American Society of Human Genetics Terms and Conditions

3 Figure 2 ATP1A1 Mutations Identified in CMT-Affected Families
(A) Schematic depicting the position of pathogenic substitutions in the ATP1A1 protein and their associated locations around the globe. (B) ATP1A protein paralogs alignment showing that the ATP1A1 substitutions are located at highly conserved residues across the four different paralogs. (C) 3D structural model of ATP1A1. (D) Electron micrograph of a sural nerve biopsy of affected individual from family 7 (Korea) showing typical signs of chronic axonal degeneration. The American Journal of Human Genetics  , DOI: ( /j.ajhg ) Copyright © 2018 American Society of Human Genetics Terms and Conditions

4 Figure 3 Genetic and Functional Studies of ATP1A1
(A and B) Mutational constraint analysis of ATP1A genes and known CMT-associated genes. ATP1A1, ATP1A2, and ATP1A3 have high missense constraint scores (A) and pLI (probability of LoF intolerance) (B); obtained from the ExAC browser. (C) Dominant CMT-associated genes have significantly higher constraint (more intolerant) scores for missense variants than recessive CMT-associated genes. (D) Two electrodes voltage clamp (TEVC) recordings at −50 mV from different CMT-associated mutations in the α1 subunit. For comparison, currents through wild-type α1 are shown in black. Dashed lines represent zero current. Summary of currents from the CMT-associated mutations shown are normalized to WT currents (mean ± SEM; n = 5–7; p < 0.05). (E) Ouabain survival assay of U2OS cells treated with 0.5 μM ouabain. Cell viability represents the luminescence values obtained from the CellTiter-Glo assay (n = 8; t test p < 0.05 compared to oua-WT-ATP1A1). (F) Distinct localization of α1 and α3 in myelinated axons. These are confocal images of teased fibers from an adult rat, immunostained with a mouse monoclonal antibody against α3 (XVIF9-G10; red), and a rabbit antiserum against α1 (NASE; green), as indicated. Two myelinated axons (1,3) have strong α3 staining (and weak α1 staining), and a myelinated axon (4) has strong α1 staining (and weak α3 staining). The incisures of myelin sheaths are α1-positive (inset). A Remak bundle (2) is α1-positive and α3-negative. Apposed arrowheads mark nodes of Ranvier. Scale bar: 10 μm. The American Journal of Human Genetics  , DOI: ( /j.ajhg ) Copyright © 2018 American Society of Human Genetics Terms and Conditions

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