R语言导入GFF3文件时UTF-8编码默认提示问题求助

在RStudio（R版本4.4.1）中运行处理GFF文件的脚本时，每次导入都会收到提示：No encoding supplied: defaulting to UTF-8.，以下是解决方法：

原脚本代码 #

# script used to get gene info
library(rtracklayer)
library(tidyverse)
 
Tc_genes <- import.gff3("~/Documents/congoScell/Annotation/TcDB-66.gff") %>%
  as_tibble() %>%
  #filter(type == "protein_coding_gene") %>%
  select(ID, description) %>%
  mutate(GeneSeurat = gsub("_", "-", ID)) %>%
  mutate(GeneDescription = paste0(ID, "::", description))
Tc_genes$GeneDescription <- gsub('\\+', ' ', Tc_genes$GeneDescription)
Tc_genes <- Tc_genes[ends_with(".1", vars=Tc_genes$ID),]
Tc_genes[] <- lapply(Tc_genes, gsub, pattern = ".1", replacement = "", fixed = TRUE)

解决方案 #

这个提示的核心原因是import.gff3读取文件时未明确指定编码，R默认使用UTF-8但会给出提示。通过显式指定编码即可解决：

方法1：直接指定UTF-8编码 #

如果确认文件是UTF-8编码，在import.gff3函数中添加encoding参数：

Tc_genes <- import.gff3("~/Documents/congoScell/Annotation/TcDB-66.gff", encoding = "UTF-8") %>%
  as_tibble() %>%
  # 后续代码保持不变
  select(ID, description) %>%
  mutate(GeneSeurat = gsub("_", "-", ID)) %>%
  mutate(GeneDescription = paste0(ID, "::", description))

方法2：先检测文件编码再指定 #

如果不确定文件编码，先用readr包的guess_encoding函数检测：

library(readr)
# 检测文件编码
encoding_result <- guess_encoding("~/Documents/congoScell/Annotation/TcDB-66.gff")
print(encoding_result)

# 根据检测结果指定编码，例如检测出是ISO-8859-1则如下：
Tc_genes <- import.gff3("~/Documents/congoScell/Annotation/TcDB-66.gff", encoding = "ISO-8859-1") %>%
  as_tibble() %>%
  # 后续代码保持不变
  select(ID, description) %>%
  mutate(GeneSeurat = gsub("_", "-", ID)) %>%
  mutate(GeneDescription = paste0(ID, "::", description))

显式指定编码不仅能消除提示，还能避免不同操作系统或环境下的编码兼容问题，让代码更健壮。

内容的提问来源于stack exchange，提问作者Otis254