bioinformatics - Trim DNA sequence using R -

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i have dna sequence files , many sequences start "cccatgcagacatagtg" or "ctccatgcagacatagtg" , have tag sequence "atgca". want remove "atgca" "cc" , "ctc". final product "gacatagtg".

does know r function can that? tried trimlrpatterns in biostrings not work since trim end not within sequence. please let me know if have solution that. thanks.

try this:

# dummy dna mydna <- c("cccatgcagacatagtg","ctccatgcagacatagtg") # define tag tag <- "atgca"  # remove character(s) before tag, including tag. gsub(paste0("^.*",tag),"",mydna)  # output # [1] "gacatagtg" "gacatagtg"

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