DNA replication timing alterations identify common markers between distinct progeroid diseases.

Abstract

Progeroid syndromes are rare genetic disorders that phenotypically resemble natural aging. Different causal mutations have been identified, but no molecular alterations have been identified that are in common to these diseases. DNA replication timing (RT) is a robust cell type-specific epigenetic feature highly conserved in the same cell types from different individuals but altered in disease. Here, we characterized DNA RT program alterations in Hutchinson-Gilford progeria syndrome (HGPS) and Rothmund-Thomson syndrome (RTS) patients compared with natural aging and cellular senescence. Our results identified a progeroid-specific RT signature that is common to cells from three HGPS and three RTS patients and distinguishes them from healthy individuals across a wide range of ages. Among the RT abnormalities, we identified the tumor protein p63 gene (TP63) as a gene marker for progeroid syndromes. By using the redifferentiation of four patient-derived induced pluripotent stem cells as a model for the onset of progeroid syndromes, we tracked the progression of RT abnormalities during development, revealing altered RT of the TP63 gene as an early event in disease progression of both HGPS and RTS. Moreover, the RT abnormalities in progeroid patients were associated with altered isoform expression of TP63 Our findings demonstrate the value of RT studies to identify biomarkers not detected by other methods, reveal abnormal TP63 RT as an early event in progeroid disease progression, and suggest TP63 gene regulation as a potential therapeutic target.

• Authors: Juan Carlos Rivera-Mulia, Romain Desprat, Claudia Trevilla-Garcia, Daniela Cornacchia, Hélène Schwerer, Takayo Sasaki, Jiao Sima, Tyler Fells, Lorenz Studer, Jean-Marc Lemaitre, David M Gilbert
• Journal: Proceedings of the National Academy of Sciences of the United States of America (Proc Natl Acad Sci U S A) Vol. 114 Issue 51 Pg. E10972-E10980 (12 19 2017) ISSN: 1091-6490 [Electronic] United States
• PMID: 29196523 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)

Chemical References

• Biomarkers
• Lamin Type A
• TP63 protein, human
• Transcription Factors
• Tumor Suppressor Proteins
• prelamin A

Topics

• Aged, 80 and over
• Biomarkers
• Child
• DNA Replication Timing
• Fibroblasts (metabolism)
• Gene Expression
• Genomics (methods)
• Humans
• Infant, Newborn
• Lamin Type A (genetics, metabolism)
• Progeria (genetics, metabolism)
• Transcription Factors (genetics)
• Tumor Suppressor Proteins (genetics)