NXSensor web tool for evaluating DNA for nucleosome exclusion sequences and accessibility to binding factors

Area of Science:

• Molecular Biology
• Genomics
• Bioinformatics

Background:

• Nucleosomes are fundamental to eukaryotic chromatin structure and gene expression regulation.
• Specific DNA sequences influence nucleosome binding and DNA flexibility.
• Understanding nucleosome positioning is crucial for gene regulation studies.

Purpose of the Study:

• To develop a computational tool, NXSensor, for identifying nucleosome exclusion sequences.
• To evaluate the length and spacing of these sequences.
• To compute a DNA accessibility score indicating the likelihood of nucleosome-free regions.

Main Methods:

• NXSensor web tool development based on known DNA sequence properties influencing nucleosome exclusion.
• Analysis of DNA sequence data from empirical and theoretical studies.
• Application of NXSensor to promoter regions of housekeeping (HK) and tissue-specific (TS) genes.

Main Results:

• NXSensor successfully identifies nucleosome exclusion sequences and calculates DNA accessibility scores.
• Significant differences in DNA accessibility were observed between HK and TS genes.
• Housekeeping genes exhibit higher accessibility, especially near transcription start sites (TSSs).

Conclusions:

• NXSensor is a valuable tool for assessing nucleosome formation potential in regulatory DNA regions.
• The findings highlight distinct chromatin accessibility patterns between HK and TS genes.
• This tool aids in understanding gene regulation and chromatin function.