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Clinical and whole-exome sequencing findings in two siblings from Hani ethnic minority with congenital glycosylation disorders.

Abstract：

BACKGROUND:PMM2-CDG, is the most common N-linked glycosylation disorder and subtype among all CDG syndromes, which are a series of genetic disorders involving the synthesis and attachment of glycoproteins and glycolipid glycans. The mutations of PMM2-CDG might lead to the loss of PMM2, which is responsible for the conversion of mannose 6- phosphate into mannose 1-phosphate. Most patients with PMM2-CDG have central nervous system involvement, abnormal coagulation, and hepatopathy. The neurological symptoms of PMM2-CDG are intellectual disability (ID), cerebellar ataxia, and peripheral neuropathy. Now, over 100 new CDG cases have been reported. However, each type of CDG is very rare, and CDGs are problematic to diagnose. In addition, few CDGs have been reported in the Chinese population. CASE PRESENTATION:Here we present a Hani ethnic minority family including two siblings with congenital glycosylation disorders. Whole-exome sequencing revealed compound heterozygous for one novel mutation (c.241-242 del variant) and previously reported mutation (c.395 T > C) in gene of PMM2. Two mutations were found in proband and her sibling by whole-exome sequencing. The mutations were identified in this family by Sanger sequencing and no mutations were detected in the normal control. CONCLUSIONS:This is the first report to describe mutations in two siblings of Hani ethnic minority which is one of five ethnic groups found only in Yunnan with a population of more than 1 million.

journal_name

BMC Med Genet

journal_title

BMC medical genetics

authors

Zhang Z,Huang TL,Ma J,He WJ,Gu H

doi

10.1186/s12881-019-0902-z

subject

Has Abstract

pub_date

2019-11-14 00:00:00

pages

181

issue

1

issn

1471-2350

pii

10.1186/s12881-019-0902-z

journal_volume

20

pub_type

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