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Comb Chem High Throughput Screen. 2019 Dec 2. doi: 10.2174/1386207322666191203110042. [Epub ahead of print]

Rare germline GLMN variants identified from blue rubber bleb nevus syndrome might impact mTOR signaling.

Author information

1
State Key Laboratory for Medical Genetics, Institute of Health Sciences, Shanghai Jiao Tong University School of Medicine (SITUSM) and Shanghai Institutes for Biological Sciences (SIBS), Chinese Academy of Sciences (CAS), Shanghai 200031. China.
2
Linyi Cancer Hospital, Linyi Shandong 276001. China.

Abstract

Backgrounds and Objective: Blue rubber bleb nevus syndrome (BRBN) or Bean syndrome is a rare venous malformation (VM)-associated disorder, which mostly affects the skin and gastrointestinal tract in early childhood. Somatic mutations in TEK have been identified from BRBN patients; however, the etiology of TEK mutation-negative patients of BRBN need further investigation.

METHOD:

Two unrelated sporadic BRBNs and one sporadic VM were firstly screened for any rare non-silent mutation in TEK by Sanger sequencing and subsequently applied to whole exome sequencing to identify underlying disease causative variants. Overexpression assay and immunoblotting were used to evaluate the functional effect of the candidate disease causative variants.

RESULTS:

In the VM case, we identified the known causative somatic mutation in the TEK gene c.2740C>T (p.Leu914Phe). In the BRBN patients, we identified two rare germline variants in GLMN gene c.761C>G (p.Pro254Arg) and c.1630G>T(p.Glu544*). The GLMN-P254R-expressing and GLMN-E544X-expressing HUVECs exhibited increased phosphorylation of mTOR-Ser-2448 in comparison with GLMN-WT-expressing HUVECs, in vitro.

CONCLUSION:

Our results demonstrated that rare germline variants in GLMN might contribute to the pathogenesis of BRBN. Moreover, abnormal mTOR signaling might be the pathogenesis mechanism underlying the dysfunction of GLMN protein.

KEYWORDS:

Blue Rubber Bleb Nevus Syndrome; GLMN; Venous Malformation; mTOR

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