The nuclear localization pattern and interaction partners of GTF2IRD1 demonstrate a role in chromatin regulation.

Abstract:

:GTF2IRD1 is one of the three members of the GTF2I gene family, clustered on chromosome 7 within a 1.8 Mb region that is prone to duplications and deletions in humans. Hemizygous deletions cause Williams-Beuren syndrome (WBS) and duplications cause WBS duplication syndrome. These copy number variations disturb a variety of developmental systems and neurological functions. Human mapping data and analyses of knockout mice show that GTF2IRD1 and GTF2I underpin the craniofacial abnormalities, mental retardation, visuospatial deficits and hypersociability of WBS. However, the cellular role of the GTF2IRD1 protein is poorly understood due to its very low abundance and a paucity of reagents. Here, for the first time, we show that endogenous GTF2IRD1 has a punctate pattern in the nuclei of cultured human cell lines and neurons. To probe the functional relationships of GTF2IRD1 in an unbiased manner, yeast two-hybrid libraries were screened, isolating 38 novel interaction partners, which were validated in mammalian cell lines. These relationships illustrate GTF2IRD1 function, as the isolated partners are mostly involved in chromatin modification and transcriptional regulation, whilst others indicate an unexpected role in connection with the primary cilium. Mapping of the sites of protein interaction also indicates key features regarding the evolution of the GTF2IRD1 protein. These data provide a visual and molecular basis for GTF2IRD1 nuclear function that will lead to an understanding of its role in brain, behaviour and human disease.

journal_name

Hum Genet

journal_title

Human genetics

authors

Carmona-Mora P,Widagdo J,Tomasetig F,Canales CP,Cha Y,Lee W,Alshawaf A,Dottori M,Whan RM,Hardeman EC,Palmer SJ

doi

10.1007/s00439-015-1591-0

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

1099-115

issue

10

eissn

0340-6717

issn

1432-1203

pii

10.1007/s00439-015-1591-0

journal_volume

134

pub_type

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