Functional analysis of novel RUNX2 mutations identified in patients with cleidocranial dysplasia.

Abstract:

:RUNX2 (Runt-related transcription factor 2) is a master regulator of osteoblast differentiation, cartilage and bone development. Pathogenic variants in RUNX2 have been linked to the Cleidocranial dysplasia (CCD), which is characterized by hypoplasia or aplasia of clavicles, delayed fontanelle closure, and dental anomalies. Here, we report 11 unrelated Polish patients with CCD caused by pathogenic alterations located in the Runt domain of RUNX2. In total, we identified eight different intragenic variants, including seven missense and one splicing mutation. Three of them are novel: c.407T>A p.(Leu136Gln), c.480C>G p.(Asn160Lys), c.659C>G p.(Thr220Arg), additional three were not functionally tested: c.391C>T p.(Arg131Cys), c.580+1G>T p.(Lys195_Arg229del), c.652A>G p.(Lys218Glu), and the remaining two: c.568C>T p.(Arg190Trp), c.673C>T p.(Arg225Trp) were previously reported and characterized. The performed transactivation and localization studies provide evidence of decreased transcriptional activity of RUNX2 due to mutations targeting the Runt domain and prove that impairment of nuclear localization signal (NLS) affects the subcellular localization of the protein. Presented data show that pathogenic variants discovered in our patients have a detrimental effect on RUNX2, triggering the CCD phenotype.

journal_name

Clin Genet

journal_title

Clinical genetics

authors

Hordyjewska-Kowalczyk E,Sowińska-Seidler A,Olech EM,Socha M,Glazar R,Kruczek A,Latos-Bieleńska A,Tylzanowski P,Jamsheer A

doi

10.1111/cge.13610

subject

Has Abstract

pub_date

2019-11-01 00:00:00

pages

429-438

issue

5

eissn

0009-9163

issn

1399-0004

journal_volume

96

pub_type

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