Genetic and Protein Network Underlying the Convergence of Rett-Syndrome-like (RTT-L) Phenotype in Neurodevelopmental...

Area of Science:

• Genetics and Molecular Biology
• Neuroscience
• Systems Biology

Background:

• Mutations in the methyl-CpG-binding protein 2 (MECP2) gene cause Rett syndrome (RTT) in girls.
• A subset of patients exhibit Rett-syndrome-like phenotypes (RTT-L) without mutations in known RTT-associated genes.

Purpose of the Study:

• To identify genetic mutations associated with RTT-L phenotypes in patients.
• To construct a comprehensive protein-protein interaction network (PPIN) for RTT and RTT-L genes.
• To uncover shared biological processes and regulatory mechanisms in RTT and RTT-L.

Main Methods:

• Genetic analysis of eight RTT-L patients to identify causative mutations.
• Literature review to annotate RTT-L associated genes.
• Construction and analysis of an integrated protein-protein interaction network (PPIN).
• Functional enrichment analysis and identification of common transcription factor binding sites.

Main Results:

• Identified mutations in genes unrelated to RTT in eight RTT-L patients.
• Constructed a PPIN with 2871 interactions among 2192 proteins linked to RTT and RTT-L genes.
• Functional analysis revealed shared biological processes and identified transcription factors (TFs) as key regulatory motifs.
• HDAC1 and CHD4 were highlighted as central players in the RTT and RTT-L interactome.

Conclusions:

• Genetic heterogeneity underlies RTT-L, involving genes distinct from those in classical RTT.
• The integrated PPIN provides insights into the molecular mechanisms shared between RTT and RTT-L.
• Identifying key regulatory factors like HDAC1 and CHD4 offers potential therapeutic targets for these complex neurological disorders.