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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
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
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:Mutations in TRAPPC12 Manifest in Progressive Childhood Encephalopathy and Golgi Dysfunction.
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,  Edvardson S
Link:https://www.ncbi.nlm.nih.gov/pubmed/28777934?dopt=Abstract
DOI:10.1016/j.ajhg.2017.07.006
Category:Am J Hum Genet
PMID:28777934
Dept Affiliation: BIOLOGY
1 Department of Biology, Concordia University, Montreal, QC H4B 1R6, Canada.
2 Department of Pediatrics, University of Washington, Seattle, WA 98195, USA.
3 Department of Pathology, Center for Precision Diagnostics, University of Washington, Seattle, WA 98195, USA.
4 Monique and Jacques Roboh Department of Genetic Research, Hadassah-Hebrew University Medical Center, Jerusalem 91120, Israel.
5 Department of Biology, Concordia University, Montreal, QC H4B 1R6, Canada; Department of Anatomy and Cell Biology, McGill University, Montreal, QC H3A 0C7, Canada. Electronic address: michael.sacher@concordia.ca.
6 Department of Pediatrics, University of Washington, Seattle, WA 98195, USA. Electronic address: ddoher@uw.edu.
7 Monique and Jacques Roboh Department of Genetic Research, Hadassah-Hebrew University Medical Center, Jerusalem 91120, Israel; Pediatric Neurology Unit, Hadassah-Hebrew University Medical Center, Jerusalem 91120, Israel.

Description:

Mutations in TRAPPC12 Manifest in Progressive Childhood Encephalopathy and Golgi Dysfunction.

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, Edvardson S

Abstract

Progressive childhood encephalopathy is an etiologically heterogeneous condition characterized by progressive central nervous system dysfunction in association with a broad range of morbidity and mortality. The causes of encephalopathy can be either non-genetic or genetic. Identifying the genetic causes and dissecting the underlying mechanisms are critical to understanding brain development and improving treatments. Here, we report that variants in TRAPPC12 result in progressive childhood encephalopathy. Three individuals from two unrelated families have either a homozygous deleterious variant (c.145delG [p.Glu49Argfs*14]) or compound-heterozygous variants (c.360dupC [p.Glu121Argfs*7] and c.1880C>T [p. Ala627Val]). The clinical phenotypes of the three individuals are strikingly similar: severe disability, microcephaly, hearing loss, spasticity, and characteristic brain imaging findings. Fibroblasts derived from all three individuals showed a fragmented Golgi that could be rescued by expression of wild-type TRAPPC12. Protein transport from the endoplasmic reticulum to and through the Golgi was delayed. TRAPPC12 is a member of the TRAPP protein complex, which functions in membrane trafficking. Variants in several other genes encoding members of the TRAPP complex have been associated with overlapping clinical presentations, indicating shared and distinct functions for each complex member. Detailed understanding of the TRAPP-opathies will illuminate the role of membrane protein transport in human disease.

PMID: 28777934 [PubMed - indexed for MEDLINE]