Novel G6B gene variant causes familial autosomal recessive thrombocytopenia and anemia.

Abstract:

OBJECTIVE:To characterize the underlying genetic and molecular defects in a consanguineous family with lifelong blood disorder manifested with thrombocytopenia (low platelets count) and anemia. METHODS:Genetic linkage analysis, exome sequencing, and functional genomics were carried out to identify and characterize the defective gene. RESULTS:We identified a novel truncation mutation (p.C108*) in chromosome 6 open reading frame 25 (C6orf25) gene in this family. We also showed the p.C108* mutation was responsible for destabilizing the encoded truncated G6B protein. Unlike the truncated form, wild-type G6B expression resulted in enhanced K562 differentiation into megakaryocytes and erythrocytes. C6orf25, also known as G6B, is an effector protein for the key hematopoiesis regulators, Src homology region 2 domain-containing phosphatases SHP-1 and SHP-2. CONCLUSION:G6B seems to act through an autosomal recessive mode of disease transmission in this family and regarded as the gene responsible for the observed hematological disorder. This inference is well supported further by in vivo evidence where similar outcomes were reported from G6b-/- and SHP1/2 DKO mouse models.

journal_name

Eur J Haematol

authors

Melhem M,Abu-Farha M,Antony D,Madhoun AA,Bacchelli C,Alkayal F,AlKhairi I,John S,Alomari M,Beales PL,Alsmadi O

doi

10.1111/ejh.12819

subject

Has Abstract

pub_date

2017-03-01 00:00:00

pages

218-227

issue

3

eissn

0902-4441

issn

1600-0609

journal_volume

98

pub_type

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