Postnatal development- and age-related changes in DNA-methylation patterns in the human genome

Area of Science:

• Genomics
• Epigenetics
• Developmental Biology

Background:

• DNA methylation patterns change with development and aging.
• Limited understanding of post-natal and age-associated epigenome dynamics exists.
• Few studies compare whole-genome methylation in newborns versus adults.

Purpose of the Study:

• Identify genomic regions with unique structures susceptible to developmental and age-related epigenome changes.
• Investigate the role of specific gene sequences in epigenome remodeling.
• Explore potential clock-like functions in age-associated epigenetic alterations.

Main Methods:

• Analyzed DNA methylation in human peripheral blood monocytes and dendritic cells.
• Utilized methylated DNA Immunoprecipitation (MeDIP) and bisulfite sequencing.
• Employed next-generation sequencing for whole-genome analysis.

Main Results:

• Identified tandem/interspersed-tandem gene repeats (e.g., PCDHG, FAM90A) as regions of interest.
• Found genes with high homology (e.g., FZD1, FZD7, FGF17) are subject to remodeling.
• Observed distinct patterns in newborns compared to adults.

Conclusions:

• Homologous gene sequences may facilitate developmental and age-related epigenome remodeling.
• These regions might possess a clock-like function for epigenetic changes.
• This suggests a fundamental role for genome architecture in higher eukaryotes.