Autosomal Recessive Keratoderma-Ichthyosis-Deafness (ARKID) Syndrome Is Caused by VPS33B Mutations Affecting Rab Protein Interaction and Collagen Modification 

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Autosomal Recessive Keratoderma-Ichthyosis-Deafness (ARKID) Syndrome Is Caused by VPS33B Mutations Affecting Rab Protein Interaction and Collagen Modification  Robert Gruber, Clare Rogerson, Christian Windpassinger, Blerida Banushi, Anna Straatman-Iwanowska, Joanna Hanley, Federico Forneris, Robert Strohal, Peter Ulz, Debra Crumrine, Gopinathan K. Menon, Stefan Blunder, Matthias Schmuth, Thomas Müller, Holly Smith, Kevin Mills, Peter Kroisel, Andreas R. Janecke, Paul Gissen  Journal of Investigative Dermatology  Volume 137, Issue 4, Pages 845-854 (April 2017) DOI: 10.1016/j.jid.2016.12.010 Copyright © 2016 The Authors Terms and Conditions

Figure 1 Clinical features of the three individuals with ARKID syndrome. (a) Patient 1: 13-year-old boy of medium height and build, presenting with diffuse PPK, sensorineural deafness, requiring hearing aids, and generalized fine scaling. (b) Patient 2: marked palmoplantar hyperkeratosis, generalized ichthyosis, contractures of fingers, and acromicria in a 43-year-old obese woman with sensorineural hearing loss. (c) Patient 3: 49-year-old man of normal weight showing pronounced PPK with the absence of the small toes after autoamputation, generalized fine ichthyosis, perimamillar hyperkeratosis, and sensorineural deafness. ARKID, autosomal recessive keratoderma-ichthyosis-deafness; PPK, palmoplantar keratoderma. Journal of Investigative Dermatology 2017 137, 845-854DOI: (10.1016/j.jid.2016.12.010) Copyright © 2016 The Authors Terms and Conditions

Figure 2 VPS33B(p.Gly131Glu) does not affect the VPS33B-VIPAR interaction. (a, b) Representative mIMCD3 cells coexpressing RFP-VIPAR and (a) wt YFP-VPS33B or (b) YFP-VPS33B(p.Gly131Glu). Scale bars = 10 μm. (c) Quantification of colocalization between VPS33B constructs and VIPAR. Data are mean ± standard deviation, unpaired t-test, ns = nonsignificant. (d) Anti-HA co-IP on HEK-293 cell lysates coexpressing HA-VPS33B or HA-VPS33B(p.Gly131Glu) with Myc-VIPAR. (e) Mapping of p.Gly131Glu mutation on structural models of the VPS33B-VIPAR complex. Left: VPS33B in orange and alpha solenoid region of VIPAR (residues 140–450) in blue; the disordered N-terminus of VIPAR is omitted. VPS33B residue Gly131 is a green sphere. Right: surface potential of VPS33B, from −5 kbTec−1 (red) to +5 kbTec−1 (blue), VIPAR is dark gray. co-IP, co-immunoprecipitation; HA, hemagglutinin; HEK, human embryonic kidney; IP, immunoprecipitation; mIMCD3, murine inner medullary collecting duct 3; RFP, red fluorescent protein; WB, western blot; wt, wild type; YFP, yellow fluorescent protein. Journal of Investigative Dermatology 2017 137, 845-854DOI: (10.1016/j.jid.2016.12.010) Copyright © 2016 The Authors Terms and Conditions

Figure 3 VPS33B(p.Gly131Glu) cannot rescue defective LH3 delivery in VPS33B-deficient mIMCD3 cells. (a–b) Representative, (a) Control, or (b) VPS33B shRNA treated mIMCD3 cells expressing LH3-mCherry, stained for collagen IV (c–d) Representative VPS33B shRNA-treated mIMCD3 cells expressing (c) YFP-VPS33B or (d) YFP-VPS33B(p.Gly131Glu) and CFP-VIPAR, LH3-mCherry and stained for collagen IV. (e) Quantification of LH3-mCherry/collagen IV colocalization. One-way ANOVA, **P ≤ 0.01, ****P ≤ 0.0001. (f, g) LC-MS-MS analysis for relative quantification of hydroxylysines (Lys-OH), galactosyl-hydroxylysines (Lys-O-Gal), and glucosylgalactosyl-hydroxylysines (Lys-O-GalGlc) from (f) urine of patient 1 and father, patient 2 and mother, age-matched controls, and patients with ARC, (g) collagen I from control, patient 2, and ARC patient skin fibroblasts, statistics not performed as only single patient samples were analyzed. Scale bars = 10 μm. Data are mean ± standard deviation. ANOVA, analysis of variance; ARC, arthrogryposis renal dysfunction and cholestasis; CFP, cyan fluorescent protein; LC-MS-MS, liquid chromatography tandem mass spectrometry; mIMCD3, murine inner medullary collecting duct 3; wt, wild type; YFP, yellow fluorescent protein. Journal of Investigative Dermatology 2017 137, 845-854DOI: (10.1016/j.jid.2016.12.010) Copyright © 2016 The Authors Terms and Conditions

Figure 4 VPS33B(p.Gly131Glu) alters VPS33B interaction with Rab25 and Rab11a. (a, b) Representative mIMCD3 cells coexpressing wt YFP-VPS33B (a) or YFP-VPS33B(p.Gly131Glu) (b), RFP-VIPAR and CFP-Rab25. Scale bars = 10 μm. (c) Quantification of the colocalization between VPS33B constructs and Rab25 in transfected mIMCD3 cells. Data are mean ± standard deviation, unpaired t-test, **** P ≤ 0.0001. (d, e) Representative mIMCD3 cells coexpressing wt YFP-VPS33B (d) or YFP-VPS33B(p.Gly131Glu) (e), RFP-VIPAR and Myc-Rab11a, stained with an α-Myc antibody. Scale bars = 10 μm. (f) Quantification of the colocalization between VPS33B constructs and Rab11a in transfected mIMCD3 cells. Data are mean ± standard deviation, unpaired t-test, **** P ≤ 0.0001. (g) α-HA co-IP on lysates of HEK293 cells coexpressing HA-VPS33B or HA-VPS33B(p.Gly131Glu) with Myc-VIPAR and Rab25-GFP. (h) a-HA co-IP on lysates of HEK293 cells coexpressing HA-VPS33B or HA-VPS33B(p.Gly131Glu) with Myc-VIPAR and Rab11a-GFP. CFP, cyan fluorescent protein; co-IP, co-immunoprecipitation; HA, hemagglutinin; HEK, human embryonic kidney; GFP, green fluorescent protein; IP, immunoprecipitation; mIMCD3, murine inner medullary collecting duct 3; RFP, red fluorescent protein; wt, wild type; YFP, yellow fluorescent protein. Journal of Investigative Dermatology 2017 137, 845-854DOI: (10.1016/j.jid.2016.12.010) Copyright © 2016 The Authors Terms and Conditions

Figure 5 Similar epidermal defects in ARKID and Vps33bfl/fl-ERT2 mice. (a) Control and (b) ARKID palmar skin, H&E, scale bars = 1 mm. (c–e) ARKID skin TEM (c) LBs (*) and (d) lipid bilayers (arrows) within corneocytes, (e) inhomogeneous LB secretion (double arrows) and aberrant LBs, scale bars = 0.5 μm. (f, g) Dermoepidermal junction in (f) control and (g) ARKID abdominal skin, anchoring fibrils (arrows), scale bars = 0.5 μm. (h) wt and (i) Vps33bfl/fl-ERT2 dorsal epidermis, H&E, scale bars = 50 μm. (j) wt and (k) Vps33bfl/fl-ERT2 epidermis TEM: normal (white arrows) versus entombed bilayers (black arrows), aberrant LBs (*), scale bars = 0.2 μm. (l) aberrant LBs at the SG-SC interface (double arrows), scale bar = 2 μm. ARKID, autosomal recessive keratoderma-ichthyosis-deafness; BM, basement membrane; h, hemidesmosomes; H&E, hematoxylin and eosin; LB, lamellar body; SB, stratum basale; SC, stratum corneum; SG, stratum granulosum; SS, stratum spinosum; TEM, transmission electron microscopy; wt, wild type. Journal of Investigative Dermatology 2017 137, 845-854DOI: (10.1016/j.jid.2016.12.010) Copyright © 2016 The Authors Terms and Conditions