diamond_rec: Perform a DIAMOND2 reciprocal best hit (RBH) search

In HajkD/orthologr: Comparative Genomics with R

Perform a DIAMOND2 reciprocal best hit (RBH) search

Description

This function performs a DIAMOND2 search (reciprocal best hit) of a given set of protein sequences against a second set of protein sequences and vice versa.

Usage

diamond_rec(
  query_file,
  subject_file,
  seq_type = "cds",
  format = "fasta",
  diamond_algorithm = "blastp",
  sensitivity_mode = "fast",
  delete_corrupt_cds = TRUE,
  eval = "1E-5",
  max.target.seqs = 10000,
  path = NULL,
  comp_cores = 1,
  diamond_params = NULL,
  clean_folders = FALSE,
  save.output = NULL
)

Arguments

query_file	a character string specifying the path to the CDS file of interest (query organism).
subject_file	a character string specifying the path to the CDS file of interest (subject organism).
seq_type	a character string specifying the sequence type stored in the input file. Options are are: "cds", "protein", or "dna". In case of "cds", sequence are translated to protein sequences, in case of "dna", cds prediction is performed on the corresponding sequences which subsequently are translated to protein sequences. Default is seq_type = "cds".
format	a character string specifying the file format of the sequence file, e.g. format = "fasta". Default is format = "fasta".
diamond_algorithm	a character string specifying the DIAMOND2 algorithm that shall be used, option is currently limited to: diamond_algorithm = "blastp"
sensitivity_mode	specify the level of alignment sensitivity. The higher the sensitivity level, the more deep homologs can be found, but at the cost of reduced computational speed. - sensitivity_mode = "faster" : fastest alignment mode, but least sensitive (default). Designed for finding hits of >70 - sensitivity_mode = "default" : Default mode. Designed for finding hits of >70 - sensitivity_mode = "fast" : fast alignment mode, but least sensitive (default). Designed for finding hits of >70 - sensitivity_mode = "mid-sensitive" : fast alignments between the fast mode and the sensitive mode in sensitivity. - sensitivity_mode = "sensitive" : fast alignments, but full sensitivity for hits >40 - sensitivity_mode = "more-sensitive" : more sensitive than the sensitive mode. - sensitivity_mode = "very-sensitive" : sensitive alignment mode. - sensitivity_mode = "ultra-sensitive" : most sensitive alignment mode (sensitivity as high as BLASTP).
delete_corrupt_cds	a logical value indicating whether sequences with corrupt base triplets should be removed from the input file. This is the case when the length of coding sequences cannot be divided by 3 and thus the coding sequence contains at least one corrupt base triplet.
eval	a numeric value specifying the E-Value cutoff for DIAMOND2 hit detection.
max.target.seqs	a numeric value specifying the number of aligned sequences to keep. Please be aware that max.target.seqs selects best hits based on the database entry and not by the best e-value. See details here: https://academic.oup.com/bioinformatics/advance-article/doi/10.1093/bioinformatics/bty833/5106166 .
path	a character string specifying the path to the DIAMOND2 program (in case you don't use the default path).
comp_cores	a numeric value specifying the number of cores to be used for multicore DIAMOND2 computations.
diamond_params	a character string listing the input paramters that shall be passed to the executing DIAMOND2 program. Default is NULL, implicating that a set of default parameters is used when running DIAMOND2.
clean_folders	a boolean value spefiying whether all internall folders storing the output of used programs shall be removed. Default is clean_folders = FALSE.
save.output	a path to the location were the DIAMOND2 output shall be stored. E.g. save.output = getwd() to store it in the current working directory, or save.output = file.path(put,your,path,here).

Details

Given a set of protein sequences A and a different set of protein sequences B, first a best hit diamond search is being performed from A to B: diamond(A,B) and afterwards a best hit diamond search is being performed from B to A: diamond(B,A). Only protein sequences that were found to be best hits in both directions are retained and returned.

This function gives the same output as blast_rec while being much much faster.

This function can be used to perform orthology inference using DIAMOND2 best reciprocal hit methodology.

Value

A data.table as returned by the diamond function, storing the geneids of orthologous genes (reciprocal best hit) in the first column and the amino acid sequences in the second column.

Author(s)

Jaruwatana Sodai Lotharukpong

References

Buchfink, B., Reuter, K., & Drost, H. G. (2021) "Sensitive protein alignments at tree-of-life scale using DIAMOND." Nature methods, 18(4), 366-368.

https://github.com/bbuchfink/diamond/wiki/3.-Command-line-options

See Also

diamond, diamond_best, set_diamond, blast_rec

Examples

## Not run: 
# performing gene orthology inference using the reciprocal best hit (RBH) method
diamond_rec(query_file = system.file('seqs/ortho_thal_cds.fasta', package = 'orthologr'),
            subject_file = system.file('seqs/ortho_lyra_cds.fasta', package = 'orthologr'))
          
          
          
# performing gene orthology inference using the reciprocal best hit (RBH) method
# starting with protein sequences
diamond_rec(query_file   = system.file('seqs/ortho_thal_aa.fasta', package = 'orthologr'),
            subject_file = system.file('seqs/ortho_lyra_aa.fasta', package = 'orthologr'),
            seq_type     = "protein")



# save the DIAMOND2 output file to the current working directory
diamond_rec(query_file   = system.file('seqs/ortho_thal_aa.fasta', package = 'orthologr'),
            subject_file = system.file('seqs/ortho_lyra_aa.fasta', package = 'orthologr'),
            seq_type     = "protein",
            save.output  = getwd())



# use multicore processing
diamond_rec(query_file    = system.file('seqs/ortho_thal_cds.fasta', package = 'orthologr'), 
            subject_file = system.file('seqs/ortho_lyra_cds.fasta', package = 'orthologr'),
            comp_cores   = 2)
           
           
           
# performing gene orthology inference using the reciprocal best hit (RBH) method
# and external path to diamond
diamond_rec(query_file   = system.file('seqs/ortho_thal_cds.fasta', package = 'orthologr'),
            subject_file = system.file('seqs/ortho_lyra_cds.fasta', package = 'orthologr'),
            path         = "path/to/diamond")
          
          
          

## End(Not run)

HajkD/orthologr documentation built on Oct. 13, 2023, 12:11 a.m.