Telomere shortening and telomere position effect in mild ring 17 syndrome

Cecilia Surace, Francesco Berardinelli, Andrea Masotti, Maria Cristina Roberti, Letizia Da Sacco, Gemma D'Elia, Pietro Sirleto, Maria Cristina Digilio, Raffaella Cusmai, Simona Grotta, Stefano Petrocchi, May El Hachem, Elisa Pisaneschi, Laura Ciocca, Serena Russo, Francesca Romana Lepri, Antonella Sgura, Adriano Angioni

Research output: Contribution to journalArticle

Abstract

Background: Ring chromosome 17 syndrome is a rare disease that arises from the breakage and reunion of the short and long arms of chromosome 17. Usually this abnormality results in deletion of genetic material, which explains the clinical features of the syndrome. Moreover, similar phenotypic features have been observed in cases with complete or partial loss of the telomeric repeats and conservation of the euchromatic regions. We studied two different cases of ring 17 syndrome, firstly, to clarify, by analyzing gene expression analysis using real-time qPCR, the role of the telomere absence in relationship with the clinical symptoms, and secondly, to look for a new model of the mechanism of ring chromosome transmission in a rare case of familial mosaicism, through cytomolecular and quantitative fluorescence in-situ hybridization (Q-FISH) investigations. Results: The results for the first case showed that the expression levels of genes selected, which were located close to the p and q ends of chromosome 17, were significantly downregulated in comparison with controls. Moreover, for the second case, we demonstrated that the telomeres were conserved, but were significantly shorter than those of age-matched controls; data from segregation analysis showed that the ring chromosome was transmitted only to the affected subjects of the family. Conclusions: Subtelomeric gene regulation is responsible for the phenotypic aspects of ring 17 syndrome; telomere shortening influences the phenotypic spectrum of this disease and strongly contributes to the familial transmission of the mosaic ring. Together, these results provide new insights into the genotype-phenotype relationships in mild ring 17 syndrome.

Original languageEnglish
Article number1
JournalEpigenetics and Chromatin
Volume7
Issue number1
DOIs
Publication statusPublished - Jan 7 2014

Keywords

  • Genetic syndrome
  • Ring 17 chromosome
  • Telomere position effect
  • Telomere shortening

ASJC Scopus subject areas

  • Genetics
  • Molecular Biology

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