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+#' @title Power Lifter
+#' 
+#' @description A function to convert genomic regions from one assembly to another.
+#' 
+#' @details This function is a wrapper for the [rtracklayer::liftOver] function.
+#' Specify the original assembly and the target assembly, and the function will
+#' convert the regions accordingly. Regions can be provided as a data frame with
+#' `these_regions`, or as a string with `qchrom`, `qstart`, and `qend`. 
+#'
+#' @param these_regions The region(s) to be queried. Can be a data frame with
+#' regions with the following columns; chrom, start, end.
+#' Or in a string in the following format chr:start-end.
+#' @param qchrom Query chromosome (prefixed or un-prefixed),
+#' Required if `these_regions` is not provided.
+#' @param qstart Query start position. Required if `these_regions` is not provided.
+#' @param qend Query end position. Required if `these_regions` is not provided.
+#' @param original_assembly The original assembly of the regions. Default is hg38
+#' @param target_assembly The target assembly of the regions. Default is grch37.
+#'
+#' @return A data frame with the regions in the selected target assembly.
+#' 
+#' @rawNamespace import(GenomicRanges, except = c("start", "end", "shift", 
+#' "union", "intersect", "setdiff", "update"))
+#' @rawNamespace import(rtracklayer, except = c("start", "end", "offset"))
+#' @import dplyr
+#' 
+#' @export
+#'
+#' @examples
+#' #Example 1 - Convert MYC region from hg38 to grch37
+#' power_lifter(these_regions = "chr8:127735434-127742951")
+#'
+#' #Example 2 - Convert MYC region from grch37 to hg38
+#' power_lifter(these_regions = "18:60790579-60987361", 
+#'              original_assembly = "grch37", 
+#'              target_assembly = "hg38")
+#'
+#' #Example 3 - Same as Example 1, but use the `qchrom`, `qstart`, and `qend`.
+#' power_lifter(qchrom = "chr8", 
+#'              qstart = 127735434, 
+#'              qend = 127742951)
+#' 
+power_lifter <- function(these_regions = NULL,
+                         qchrom = NULL,
+                         qstart = NULL,
+                         qend = NULL,
+                         original_assembly = "hg38",
+                         target_assembly = "grch37"){
+  
+  #format incoming regions accordingly
+  region_table = BioMaesteR::purify_regions(these_regions = these_regions,
+                                            qchrom = qchrom,
+                                            qstart = qstart,
+                                            qend = qend,
+                                            projection = original_assembly)
+  
+  #convert incoming regions to GRanges object
+  incoming = GenomicRanges::makeGRangesFromDataFrame(region_table, 
+                                                     keep.extra.columns = TRUE)
+  
+  #load the correct liftOver chains
+  if(target_assembly == "grch37"){
+    chain_file = rtracklayer::import.chain(system.file("extdata", 
+                                                       "hg38ToHg19.over.chain", 
+                                                       package = "BioMaesteR"))
+  }else if(target_assembly == "hg38"){
+    chain_file = rtracklayer::import.chain(system.file("extdata", 
+                                                       "hg19ToHg38.over.chain", 
+                                                       package = "BioMaesteR"))
+  }else{
+    stop("Target assembly not recognized. Please use either 'grch37' or 'hg38'.")
+  }
+  
+  #liftOver
+  lifted = rtracklayer::liftOver(incoming, chain = chain_file)
+  
+  #revert object to data frame
+  lifted = data.frame(lifted@unlistData) %>%
+    dplyr::rename(chrom = seqnames)
+  
+  #deal with chr prefixes based on target assembly
+  lifted = purify_chr(incoming_table = lifted, 
+                      projection = target_assembly)
+  
+  return(lifted)
+}