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The phenotype associated with variants in TANGO2 may be explained by a dual role of the protein in ER-to-Golgi transport and at the mitochondria.

Author(s): Milev MP, Saint-Dic D, Zardoui K, Klopstock T, Law C, Distelmaier F, Sacher M

TANGO2 variants result in a complex disease phenotype consisting of recurrent crisis-induced rhabdomyolysis, encephalopathy, seizures, lactic acidosis, hypoglycemia, and cardiac arrhythmias. Although first described in a fruit fly model as a protein necessa...

Article GUID: 32909282
Characterization of three TRAPPC11 variants suggests a critical role for the extreme carboxy terminus of the protein.

Author(s): Milev MP, Stanga D, Schänzer A, Nascimento A, Saint-Dic D, Ortez C, Benito DN, Barrios DG, Colomer J, Badosa C, Jou C, Gallano P, Gonzalez-Q...

Sci Rep. 2019 Oct 01;9(1):14036 Authors: Milev MP, Stanga D, Schänzer A, Nascimento A, Saint-Dic D, Ortez C, Benito DN, Barrios DG, Colomer J, Badosa C, Jou C, Gallano P, Gonzalez-Quereda L, ...

Article GUID: 31575891
Mutations in TRAPPC12 Manifest in Progressive Childhood Encephalopathy and Golgi Dysfunction.

Author(s): Milev MP, Grout ME, Saint-Dic D, Cheng YH, Glass IA, Hale CJ, Hanna DS, Dorschner MO, Prematilake K, Shaag A, Elpeleg O, Sacher M, Doherty D...

Am J Hum Genet. 2017 Aug 03;101(2):291-299 Authors: Milev MP, Grout ME, Saint-Dic D, Cheng YH, Glass IA, Hale CJ, Hanna DS, Dorschner MO, Prematilake K, Shaag A, Elpeleg O, Sacher M, Doherty D, Ed...

Article GUID: 28777934
TRAMM/TrappC12 plays a role in chromosome congression, kinetochore stability, and CENP-E recruitment.

Author(s): Milev MP, Hasaj B, Saint-Dic D, Snounou S, Zhao Q, Sacher M

J Cell Biol. 2015 Apr 27;209(2):221-34 Authors: Milev MP, Hasaj B, Saint-Dic D, Snounou S, Zhao Q, Sacher M

Article GUID: 25918224
TRAPPC11 and GOSR2 mutations associate with hypoglycosylation of α-dystroglycan and muscular dystrophy.

Author(s): Larson AA, Baker PR, Milev MP, Press CA, Sokol RJ, Cox MO, Lekostaj JK, Stence AA, Bossler AD, Mueller JM, Prematilake K, Tadjo TF, Williams...

Skelet Muscle. 2018 05 31;8(1):17 Authors: Larson AA, Baker PR, Milev MP, Press CA, Sokol RJ, Cox MO, Lekostaj JK, Stence AA, Bossler AD, Mueller JM, Prematilake K, Tadjo TF, Williams CA, Sacher M...

Article GUID: 29855340
Bi-allelic mutations in TRAPPC2L result in a neurodevelopmental disorder and have an impact on RAB11 in fibroblasts.

Author(s): Milev MP, Graziano C, Karall D, Kuper WFE, Al-Deri N, Cordelli DM, Haack TB, Danhauser K, Iuso A, Palombo F, Pippucci T, Prokisch H, Saint-D...

J Med Genet. 2018 Nov;55(11):753-764 Authors: Milev MP, Graziano C, Karall D, Kuper WFE, Al-Deri N, Cordelli DM, Haack TB, Danhauser K, Iuso A, Palombo F, Pippucci T, Prokisch H, Saint-Dic D, Seri...

Article GUID: 30120216
TRAPPopathies: An emerging set of disorders linked to variations in the genes encoding transport protein particle (TRAPP)-associated proteins.

Author(s): Sacher M, Shahrzad N, Kamel H, Milev MP

Traffic. 2019 01;20(1):5-26 Authors: Sacher M, Shahrzad N, Kamel H, Milev MP

Article GUID: 30152084
TRAPPC11 functions in autophagy by recruiting ATG2B-WIPI4/WDR45 to preautophagosomal membranes.

Author(s): Stanga D, Zhao Q, Milev MP, Saint-Dic D, Jimenez-Mallebrera C, Sacher M

Traffic. 2019 May;20(5):325-345 Authors: Stanga D, Zhao Q, Milev MP, Saint-Dic D, Jimenez-Mallebrera C, Sacher M

Article GUID: 30843302
Title:Bi-allelic mutations in TRAPPC2L result in a neurodevelopmental disorder and have an impact on RAB11 in fibroblasts.
Authors:Milev MP,  Graziano C,  Karall D,  Kuper WFE,  Al-Deri N,  Cordelli DM,  Haack TB,  Danhauser K,  Iuso A,  Palombo F,  Pippucci T,  Prokisch H,  Saint-Dic D,  Seri M,  Stanga D,  Cenacchi G,  van Gassen KLI,  Zschocke J,  Fauth C,  Mayr JA,  Sacher M,  van Hasselt PM
Link:https://www.ncbi.nlm.nih.gov/pubmed/30120216?dopt=Abstract
DOI:10.1136/jmedgenet-2018-105441
Category:J Med Genet
PMID:30120216
Dept Affiliation: BIOLOGY
1 Department of Biology, Concordia University, Montreal, Quebec, Canada.
2 Medical Genetics Unit, Policlinico S. Orsola-Malpighi, University of Bologna, Bologna, Italy.
3 Clinic for Pediatrics, Division of Inherited Metabolic Disorders, Medical University of Innsbruck, Innsbruck, Austria.
4 Department of Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, The Netherlands.
5 Pediatric Neurology Unit, Policlinico S. Orsola-Malpighi, University of Bologna, Bologna, Italy.
6 Institute of Human Genetics, Technische Universität München, Munich, Germany.
7 Institute of Medical Genetics and Applied Genomics, University of Tuebingen, Tübingen, Germany.
8 IRCCS Institute of Neurological Sciences of Bologna, Bellaria Hospital, Bologna, Italy.
9 Institute of Human Genetics, Helmholtz Zentrum München, Neuherberg, Germany.
10 Department of Biomedical and Neuromotor Science, Alma Mater, University of Bologna, Bologna, Italy.
11 Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands.
12 Division of Human Genetics, Medical University of Innsbruck, Innsbruck, Austria.
13 Department of Paediatrics, Salzburger Landeskliniken and Paracelsus Medical University, Salzburg, Austria.
14 Department of Anatomy and Cell Biology, McGIll University, Montreal, Quebec, Canada.

Description:

Bi-allelic mutations in TRAPPC2L result in a neurodevelopmental disorder and have an impact on RAB11 in fibroblasts.

J Med Genet. 2018 Nov;55(11):753-764

Authors: Milev MP, Graziano C, Karall D, Kuper WFE, Al-Deri N, Cordelli DM, Haack TB, Danhauser K, Iuso A, Palombo F, Pippucci T, Prokisch H, Saint-Dic D, Seri M, Stanga D, Cenacchi G, van Gassen KLI, Zschocke J, Fauth C, Mayr JA, Sacher M, van Hasselt PM

Abstract

BACKGROUND: The combination of febrile illness-induced encephalopathy and rhabdomyolysis has thus far only been described in disorders that affect cellular energy status. In the absence of specific metabolic abnormalities, diagnosis can be challenging.

OBJECTIVE: The objective of this study was to identify and characterise pathogenic variants in two individuals from unrelated families, both of whom presented clinically with a similar phenotype that included neurodevelopmental delay, febrile illness-induced encephalopathy and episodes of rhabdomyolysis, followed by developmental arrest, epilepsy and tetraplegia.

METHODS: Whole exome sequencing was used to identify pathogenic variants in the two individuals. Biochemical and cell biological analyses were performed on fibroblasts from these individuals and a yeast two-hybrid analysis was used to assess protein-protein interactions.

RESULTS: Probands shared a homozygous TRAPPC2L variant (c.109G>T) resulting in a p.Asp37Tyr missense variant. TRAPPC2L is a component of transport protein particle (TRAPP), a group of multisubunit complexes that function in membrane traffic and autophagy. Studies in patient fibroblasts as well as in a yeast system showed that the p.Asp37Tyr protein was present but not functional and resulted in specific membrane trafficking delays. The human missense mutation and the analogous mutation in the yeast homologue Tca17 ablated the interaction between TRAPPC2L and TRAPPC10/Trs130, a component of the TRAPP II complex. Since TRAPP II activates the GTPase RAB11, we examined the activation state of this protein and found increased levels of the active RAB, correlating with changes in its cellular morphology.

CONCLUSIONS: Our study implicates a RAB11 pathway in the aetiology of the TRAPPC2L disorder and has implications for other TRAPP-related disorders with similar phenotypes.

PMID: 30120216 [PubMed - in process]