Characterization of the nucleolar gene product, treacle, in Treacher Collins syndrome.

Abstract:

:Treacher Collins syndrome (TCS) is an autosomal dominant disorder of craniofacial development caused by mutations in the gene TCOF1. Its gene product, treacle, consists mainly of a central repeat domain, which shows it to be structurally related to the nucleolar phosphoprotein Nopp140. Treacle remains mostly uncharacterized to date. Herein we show that it, like Nopp140, is a highly phosphorylated nucleolar protein. However, treacle fails to colocalize with Nopp140 to Cajal (coiled) bodies. As in the case of Nopp140, casein kinase 2 appears to be responsible for the unusually high degree of phosphorylation as evidenced by its coimmunoprecipitation with treacle. Based on these and other observations, treacle and Nopp140 exhibit distinct but overlapping functions. The majority of TCOF1 mutations in TCS lead to premature termination codons that could affect the cellular levels of the full-length treacle. We demonstrate however, that the cellular amount of treacle varies less than twofold among a collection of primary fibroblasts and lymphoblasts and regardless of whether the cells were derived from TCS patients or healthy individuals. Therefore, cells of TCS patients possess a mechanism to maintain wild-type levels of full-length treacle from a single allele.

journal_name

Mol Biol Cell

authors

Isaac C,Marsh KL,Paznekas WA,Dixon J,Dixon MJ,Jabs EW,Meier UT

doi

10.1091/mbc.11.9.3061

keywords:

subject

Has Abstract

pub_date

2000-09-01 00:00:00

pages

3061-71

issue

9

eissn

1059-1524

issn

1939-4586

journal_volume

11

pub_type

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