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 Genetjournal_title
Clinical geneticsauthors
Hordyjewska-Kowalczyk E,Sowińska-Seidler A,Olech EM,Socha M,Glazar R,Kruczek A,Latos-Bieleńska A,Tylzanowski P,Jamsheer Adoi
10.1111/cge.13610subject
Has Abstractpub_date
2019-11-01 00:00:00pages
429-438issue
5eissn
0009-9163issn
1399-0004journal_volume
96pub_type
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