2007/04/17 by Bo Deng, Deng, Bo
Biochemistry, Genetics and Molecular Biology · Medicine · #FOS: Biological sciences #Genetic factors in colorectal cancer #Genomics (q-bio.GN) #RNA and protein synthesis mechanisms
paper · pdf · doi:10.48550/arxiv.0704.2191
openalex publication_date 2007/04/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Chargaff's second parity rule holds empirically for most types of DNA that along single strands of DNA the base contents are equal for complimentary bases, A = T, G = C. A Markov chain model is constructed to track the evolution of any single base position along single strands of genomes whose organisms are equipped with replication mismatch repair. Under the key assumptions that mismatch error rates primarily depend the number of hydrogen bonds of nucleotides and that the mismatch repairing process itself makes strand recognition error, the model shows that the steady state probabilities for any base position to take on one of the 4 nucleotide bases are equal for complimentary bases. As a result, Chargaff's second parity rule is the manifestation of the Law of Large Number acting on the steady state probabilities. More importantly, because the model pinpoints mismatch repair as a basis of the rule, it is suitable for experimental verification.