Loss of SMPD4 Causes a Developmental Disorder Characterized by Microcephaly and Congenital Arthrogryposis.
NET13
SMPD4
arthrogryposis
microcephaly
neutral-sphingomyelinase
Journal
American journal of human genetics
ISSN: 1537-6605
Titre abrégé: Am J Hum Genet
Pays: United States
ID NLM: 0370475
Informations de publication
Date de publication:
03 10 2019
03 10 2019
Historique:
received:
07
05
2019
accepted:
15
08
2019
pubmed:
10
9
2019
medline:
3
4
2020
entrez:
10
9
2019
Statut:
ppublish
Résumé
Sphingomyelinases generate ceramide from sphingomyelin as a second messenger in intracellular signaling pathways involved in cell proliferation, differentiation, or apoptosis. Children from 12 unrelated families presented with microcephaly, simplified gyral pattern of the cortex, hypomyelination, cerebellar hypoplasia, congenital arthrogryposis, and early fetal/postnatal demise. Genomic analysis revealed bi-allelic loss-of-function variants in SMPD4, coding for the neutral sphingomyelinase-3 (nSMase-3/SMPD4). Overexpression of human Myc-tagged SMPD4 showed localization both to the outer nuclear envelope and the ER and additionally revealed interactions with several nuclear pore complex proteins by proteomics analysis. Fibroblasts from affected individuals showed ER cisternae abnormalities, suspected for increased autophagy, and were more susceptible to apoptosis under stress conditions, while treatment with siSMPD4 caused delayed cell cycle progression. Our data show that SMPD4 links homeostasis of membrane sphingolipids to cell fate by regulating the cross-talk between the ER and the outer nuclear envelope, while its loss reveals a pathogenic mechanism in microcephaly.
Identifiants
pubmed: 31495489
pii: S0002-9297(19)30309-X
doi: 10.1016/j.ajhg.2019.08.006
pmc: PMC6817560
pii:
doi:
Substances chimiques
SMPD3 protein, human
EC 3.1.4.12
Sphingomyelin Phosphodiesterase
EC 3.1.4.12
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
689-705Subventions
Organisme : NHGRI NIH HHS
ID : UM1 HG008900
Pays : United States
Organisme : NHGRI NIH HHS
ID : U54 HG003067
Pays : United States
Organisme : NINDS NIH HHS
ID : R01 NS050375
Pays : United States
Organisme : NINDS NIH HHS
ID : R01 NS085023
Pays : United States
Organisme : NINDS NIH HHS
ID : K08 NS092898
Pays : United States
Informations de copyright
Copyright © 2019 American Society of Human Genetics. All rights reserved.
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