13 my $CONFIDENCE = 0.95;
16 my $NMB = 1024; # default
20 my $read_type = 1; # default, single end with qual
22 my @transcript_title = ("transcript_id", "gene_id", "length", "effective_length", "expected_count", "TPM", "FPKM", "IsoPct", "pme_expected_count", "pme_TPM", "pme_FPKM", "IsoPct_from_pme_TPM", "TPM_ci_lower_bound", "TPM_ci_upper_bound", "FPKM_ci_lower_bound", "FPKM_ci_upper_bound");
24 my @gene_title = ("gene_id", "transcript_id(s)", "length", "effective_length", "expected_count", "TPM", "FPKM", "pme_expected_count", "pme_TPM", "pme_FPKM", "TPM_ci_lower_bound", "TPM_ci_upper_bound", "FPKM_ci_lower_bound", "FPKM_ci_upper_bound");
31 my $chunkMbs = 0; # 0 = use bowtie default
52 my $genBamF = 1; # default is generating transcript bam file
53 my $genGenomeBamF = 0;
56 my $var_opt = 0; # temporarily, only for internal use
62 my $keep_intermediate_files = 0;
64 my $strand_specific = 0;
67 my ($time_start, $time_end, $time_alignment, $time_rsem, $time_ci) = (0, 0, 0, 0, 0);
73 my ($refName, $sampleName, $sampleToken, $temp_dir, $stat_dir, $imdName, $statName) = ();
76 GetOptions("keep-intermediate-files" => \$keep_intermediate_files,
77 "temporary-folder=s" => \$temp_dir,
78 "no-qualities" => \$no_qual,
79 "paired-end" => \$paired_end,
80 "strand-specific" => \$strand_specific,
83 "sam-header-info=s" => \$fn_list,
85 "seed-length=i" => \$L,
86 "bowtie-path=s" => \$bowtie_path,
89 "bowtie-m=i" => \$maxHits,
90 "bowtie-chunkmbs=i" => \$chunkMbs,
91 "phred33-quals" => \$phred33,
92 "phred64-quals" => \$phred64, #solexa1.3-quals" => \$phred64,
93 "solexa-quals" => \$solexa,
94 "forward-prob=f" => \$probF,
95 "fragment-length-min=i" => \$minL,
96 "fragment-length-max=i" => \$maxL,
97 "fragment-length-mean=f" => \$mean,
98 "fragment-length-sd=f" => \$sd,
99 "estimate-rspd" => \$estRSPD,
100 "num-rspd-bins=i" => \$B,
101 "p|num-threads=i" => \$nThreads,
102 "no-bam-output" => sub { $genBamF = 0; },
103 "output-genome-bam" => \$genGenomeBamF,
104 "sampling-for-bam" => \$sampling,
106 "calc-ci" => \$calcCI,
107 "ci-memory=i" => \$NMB,
109 "q|quiet" => \$quiet,
110 "h|help" => \$help) or pod2usage(-exitval => 2, -verbose => 2);
112 pod2usage(-verbose => 2) if ($help == 1);
115 #check parameters and options
117 if ($is_sam || $is_bam) {
118 pod2usage(-msg => "Invalid number of arguments!", -exitval => 2, -verbose => 2) if (scalar(@ARGV) != 3);
119 pod2usage(-msg => "--sam and --bam cannot be active at the same time!", -exitval => 2, -verbose => 2) if ($is_sam == 1&& $is_bam == 1);
120 pod2usage(-msg => "--bowtie-path, --bowtie-n, --bowtie-e, --bowtie-m, --phred33-quals, --phred64-quals or --solexa-quals cannot be set if input is SAM/BAM format!", -exitval => 2, -verbose => 2) if ($bowtie_path ne "" || $C != 2 || $E != 99999999 || $maxHits != 200 || $phred33 || $phred64 || $solexa);
123 pod2usage(-msg => "Invalid number of arguments!", -exitval => 2, -verbose => 2) if (!$paired_end && scalar(@ARGV) != 3 || $paired_end && scalar(@ARGV) != 4);
124 pod2usage(-msg => "Only one of --phred33-quals --phred64-quals/--solexa1.3-quals --solexa-suqls can be active!", -exitval => 2, -verbose => 2) if ($phred33 + $phred64 + $solexa > 1);
125 podwusage(-msg => "--sam , --bam or --sam-header-info cannot be set if use bowtie aligner to produce alignments!", -exitval => 2, -verbose => 2) if ($is_sam || $is_bam || $fn_list ne "");
128 pod2usage(-msg => "Forward probability should be in [0, 1]!", -exitval => 2, -verbose => 2) if ($probF < 0 || $probF > 1);
129 pod2usage(-msg => "Min fragment length should be at least 1!", -exitval => 2, -verbose => 2) if ($minL < 1);
130 pod2usage(-msg => "Min fragment length should be smaller or equal to max fragment length!", -exitval => 2, -verbose => 2) if ($minL > $maxL);
131 pod2usage(-msg => "The memory allocated for calculating credibility intervals should be at least 1 MB!\n", -exitval => 2, -verbose => 2) if ($NMB < 1);
132 pod2usage(-msg => "Number of threads should be at least 1!\n", -exitval => 2, -verbose => 2) if ($nThreads < 1);
133 pod2usage(-msg => "Seed length should be at least 5!\n", -exitval => 2, -verbose => 2) if ($L < 5);
134 pod2usage(-msg => "--sampling-for-bam cannot be specified if --no-bam-output is specified!\n", -exitval => 2, -verbose => 2) if ($sampling && !$genBamF);
135 pod2usage(-msg => "--output-genome-bam cannot be specified if --no-bam-output is specified!\n", -exitval => 2, -verbose => 2) if ($genGenomeBamF && !$genBamF);
137 if ($L < 25) { print "Warning: the seed length set is less than 25! This is only allowed if the references are not added poly(A) tails.\n"; }
139 if ($strand_specific) { $probF = 1.0; }
142 if ($no_qual) { $read_type = 2; }
143 else { $read_type = 3; }
146 if ($no_qual) { $read_type = 0; }
147 else { $read_type = 1; }
150 if (scalar(@ARGV) == 3) {
151 if ($is_sam || $is_bam) { $inpF = $ARGV[0]; }
152 else {$mate1_list = $ARGV[0]; }
154 $sampleName = $ARGV[2];
157 $mate1_list = $ARGV[0];
158 $mate2_list = $ARGV[1];
160 $sampleName = $ARGV[3];
163 if ($genGenomeBamF) {
164 open(INPUT, "$refName.ti");
165 my $line = <INPUT>; chomp($line);
167 my ($M, $type) = split(/ /, $line);
168 pod2usage(-msg => "No genome information provided, so genome bam file cannot be generated!\n", -exitval => 2, -verbose => 2) if ($type != 0);
171 my $pos = rindex($sampleName, '/');
172 if ($pos < 0) { $sampleToken = $sampleName; }
173 else { $sampleToken = substr($sampleName, $pos + 1); }
175 if ($temp_dir eq "") { $temp_dir = "$sampleName.temp"; }
176 $stat_dir = "$sampleName.stat";
178 if (!(-d $temp_dir) && !mkdir($temp_dir)) { print "Fail to create folder $temp_dir.\n"; exit(-1); }
179 if (!(-d $stat_dir) && !mkdir($stat_dir)) { print "Fail to create folder $stat_dir.\n"; exit(-1); }
181 $imdName = "$temp_dir/$sampleToken";
182 $statName = "$stat_dir/$sampleToken";
184 if (!$is_sam && !$is_bam && !$no_qual && ($phred33 + $phred64 + $solexa == 0)) { $phred33 = 1; }
186 my ($mate_minL, $mate_maxL) = (1, $maxL);
188 if ($bowtie_path ne "") { $bowtie_path .= "/"; }
190 my ($fn, $dir, $suf) = fileparse($0);
193 if (!$is_sam && !$is_bam) {
194 $command = $bowtie_path."bowtie";
195 if ($no_qual) { $command .= " -f"; }
196 else { $command .= " -q"; }
198 if ($phred33) { $command .= " --phred33-quals"; }
199 elsif ($phred64) { $command .= " --phred64-quals"; }
200 elsif ($solexa) { $command .= " --solexa-quals"; }
202 $command .= " -n $C -e $E -l $L";
203 if ($read_type == 2 || $read_type == 3) { $command .= " -I $minL -X $maxL"; }
204 if ($chunkMbs > 0) { $command .= " --chunkmbs $chunkMbs"; }
206 if ($strand_specific || $probF == 1.0) { $command .= " --norc"; }
207 elsif ($probF == 0.0) { $command .= " --nofw"; }
209 $command .= " -p $nThreads -a -m $maxHits -S";
210 if ($quiet) { $command .= " --quiet"; }
212 $command .= " $refName";
213 if ($read_type == 0 || $read_type == 1) {
214 $command .= " $mate1_list";
217 $command .= " -1 $mate1_list -2 $mate2_list";
220 # pipe to samtools to generate a BAM file
221 $command .= " | $dir\sam/samtools view -S -b -o $imdName.bam -";
223 if ($mTime) { $time_start = time(); }
225 &runCommand($command);
227 if ($mTime) { $time_end = time(); $time_alignment = $time_end - $time_start; }
229 $inpF = "$imdName.bam";
230 $is_bam = 1; # alignments are outputed as a BAM file
233 if ($mTime) { $time_start = time(); }
235 $command = $dir."rsem-parse-alignments $refName $imdName $statName";
238 if ($is_sam) { $samInpType = "s"; }
239 elsif ($is_bam) { $samInpType = "b"; }
241 $command .= " $samInpType $inpF -t $read_type";
242 if ($fn_list ne "") { $command .= " -l $fn_list"; }
243 if ($tagName ne "") { $command .= " -tag $tagName"; }
244 if ($quiet) { $command .= " -q"; }
246 &runCommand($command);
248 $command = $dir."rsem-build-read-index $gap";
250 case 0 { $command .= " 0 $quiet $imdName\_alignable.fa"; }
251 case 1 { $command .= " 1 $quiet $imdName\_alignable.fq"; }
252 case 2 { $command .= " 0 $quiet $imdName\_alignable_1.fa $imdName\_alignable_2.fa"; }
253 case 3 { $command .= " 1 $quiet $imdName\_alignable_1.fq $imdName\_alignable_2.fq"; }
255 &runCommand($command);
257 my $doesOpen = open(OUTPUT, ">$imdName.mparams");
258 if ($doesOpen == 0) { print "Cannot generate $imdName.mparams!\n"; exit(-1); }
259 print OUTPUT "$minL $maxL\n";
260 print OUTPUT "$probF\n";
261 print OUTPUT "$estRSPD\n";
263 print OUTPUT "$mate_minL $mate_maxL\n";
264 print OUTPUT "$mean $sd\n";
268 $command = $dir."rsem-run-em $refName $read_type $sampleName $imdName $statName -p $nThreads";
270 $command .= " -b $samInpType $inpF";
271 if ($fn_list ne "") { $command .= " 1 $fn_list"; }
272 else { $command .= " 0"; }
273 if ($sampling) { $command .= " --sampling"; }
275 if ($calcCI || $var_opt) { $command .= " --gibbs-out"; }
276 if ($quiet) { $command .= " -q"; }
278 &runCommand($command);
280 &collectResults("isoform", "$imdName.iso_res", "$sampleName.isoforms.results"); # isoform level
281 &collectResults("gene", "$imdName.gene_res", "$sampleName.genes.results"); # gene level
284 $command = $dir."sam/samtools sort $sampleName.transcript.bam $sampleName.transcript.sorted";
285 &runCommand($command);
286 $command = $dir."sam/samtools index $sampleName.transcript.sorted.bam";
287 &runCommand($command);
289 if ($genGenomeBamF) {
290 $command = $dir."rsem-tbam2gbam $refName $sampleName.transcript.bam $sampleName.genome.bam";
291 &runCommand($command);
292 $command = $dir."sam/samtools sort $sampleName.genome.bam $sampleName.genome.sorted";
293 &runCommand($command);
294 $command = $dir."sam/samtools index $sampleName.genome.sorted.bam";
295 &runCommand($command);
299 if ($mTime) { $time_end = time(); $time_rsem = $time_end - $time_start; }
301 if ($mTime) { $time_start = time(); }
303 if ($calcCI || $var_opt) {
304 $command = $dir."rsem-run-gibbs $refName $imdName $statName $BURNIN $NCV $SAMPLEGAP";
305 $command .= " -p $nThreads";
306 if ($var_opt) { $command .= " --var"; }
307 if ($quiet) { $command .= " -q"; }
308 &runCommand($command);
312 system("mv $sampleName.isoforms.results $imdName.isoforms.results.bak1");
313 system("mv $sampleName.genes.results $imdName.genes.results.bak1");
314 &collectResults("isoform", "$imdName.iso_res", "$sampleName.isoforms.results"); # isoform level
315 &collectResults("gene", "$imdName.gene_res", "$sampleName.genes.results"); # gene level
317 $command = $dir."rsem-calculate-credibility-intervals $refName $imdName $statName $CONFIDENCE $NCV $NSPC $NMB";
318 $command .= " -p $nThreads";
319 if ($quiet) { $command .= " -q"; }
320 &runCommand($command);
322 system("mv $sampleName.isoforms.results $imdName.isoforms.results.bak2");
323 system("mv $sampleName.genes.results $imdName.genes.results.bak2");
324 &collectResults("isoform", "$imdName.iso_res", "$sampleName.isoforms.results"); # isoform level
325 &collectResults("gene", "$imdName.gene_res", "$sampleName.genes.results"); # gene level
328 if ($mTime) { $time_end = time(); $time_ci = $time_end - $time_start; }
330 if ($mTime) { $time_start = time(); }
332 if (!$keep_intermediate_files) {
333 &runCommand("rm -rf $temp_dir", "Fail to delete the temporary folder!");
336 if ($mTime) { $time_end = time(); }
339 open(OUTPUT, ">$sampleName.time");
340 print OUTPUT "Aligning reads: $time_alignment s.\n";
341 print OUTPUT "Estimating expression levels: $time_rsem s.\n";
342 print OUTPUT "Calculating credibility intervals: $time_ci s.\n";
343 my $time_del = $time_end - $time_start;
344 # print OUTPUT "Delete: $time_del s.\n";
351 my $status = system($_[0]);
354 if (scalar(@_) > 1) { $errmsg .= $_[1]."\n"; }
355 $errmsg .= "\"$_[0]\" failed! Plase check if you provide correct parameters/options for the pipeline!\n";
372 $local_status = open(INPUT, $inpF);
373 if ($local_status == 0) { print "Fail to open file $inpF!\n"; exit(-1); }
377 while ($line = <INPUT>) {
379 my @local_arr = split(/\t/, $line);
380 push(@results, \@local_arr);
385 $local_status = open(OUTPUT, ">$outF");
386 if ($local_status == 0) { print "Fail to create file $outF!\n"; exit(-1); }
388 my $n = scalar(@results);
389 my $m = scalar(@{$results[0]});
394 for (my $i = 0; $i < $n; $i++) {
395 if ($_[0] eq "isoform") { push(@out_arr, $transcript_title[$i]); }
396 elsif ($_[0] eq "gene") { push(@out_arr, $gene_title[$i]); }
397 else { print "A bug on 'collectResults' is detected!\n"; exit(-1); }
399 print OUTPUT "@out_arr\n";
401 for (my $i = 0; $i < $m; $i++) {
403 for (my $j = 0; $j < $n; $j++) { push(@out_arr, $results[$j][$i]); }
404 print OUTPUT "@out_arr\n";
414 rsem-calculate-expression
420 rsem-calculate-expression [options] upstream_read_file(s) reference_name sample_name
421 rsem-calculate-expression [options] --paired-end upstream_read_file(s) downstream_read_file(s) reference_name sample_name
422 rsem-calculate-expression [options] --sam/--bam [--paired-end] input reference_name sample_name
430 =item B<upstream_read_files(s)>
432 Comma-separated list of files containing single-end reads or upstream reads for paired-end data. By default, these files are assumed to be in FASTQ format. If the --no-qualities option is specified, then FASTA format is expected.
434 =item B<downstream_read_file(s)>
436 Comma-separated list of files containing downstream reads which are paired with the upstream reads. By default, these files are assumed to be in FASTQ format. If the --no-qualities option is specified, then FASTA format is expected.
440 SAM/BAM formatted input file. If "-" is specified for the filename, SAM/BAM input is instead assumed to come from standard input. RSEM requires all alignments of the same read group together. For paired-end reads, RSEM also requires the two mates of any alignment be adjacent. See Description section for how to make input file obey RSEM's requirements.
442 =item B<reference_name>
444 The name of the reference used. The user must have run 'rsem-prepare-reference' with this reference_name before running this program.
448 The name of the sample analyzed. All output files are prefixed by this name (e.g., sample_name.genes.results)
456 =item B<--paired-end>
458 Input reads are paired-end reads. (Default: off)
460 =item B<--no-qualities>
462 Input reads do not contain quality scores. (Default: off)
464 =item B<--strand-specific>
466 The RNA-Seq protocol used to generate the reads is strand specific, i.e., all (upstream) reads are derived from the forward strand. This option is equivalent to --forward-prob=1.0. With this option set, if RSEM runs the Bowtie aligner, the '--norc' Bowtie option will be used, which disables alignment to the reverse strand of transcripts. (Default: off)
470 Input file is in SAM format. (Default: off)
474 Input file is in BAM format. (Default: off)
476 =item B<--sam-header-info> <file>
478 RSEM reads header information from input by default. If this option is on, header information is read from the specified file. For the format of the file, please see SAM official website. (Default: "")
480 =item B<-p/--num-threads> <int>
482 Number of threads to use. Both Bowtie and expression estimation will use this many threads. (Default: 1)
484 =item B<--no-bam-output>
486 Do not output any BAM file. (Default: off)
488 =item B<--output-genome-bam>
490 Generate a BAM file, 'sample_name.genome.bam', with alignments mapped to genomic coordinates and annotated with their posterior probabilities. In addition, RSEM will call samtools (included in RSEM package) to sort and index the bam file. 'sample_name.genome.sorted.bam' and 'sample_name.genome.sorted.bam.bai' will be generated. (Default: off)
492 =item B<--sampling-for-bam>
494 When RSEM generates a BAM file, instead of outputing all alignments a read has with their posterior probabilities, one alignment is sampled according to the posterior probabilities. The sampling procedure includes the alignment to the "noise" transcript, which does not appear in the BAM file. Only the sampled alignment has a weight of 1. All other alignments have weight 0. If the "noise" transcript is sampled, all alignments appeared in the BAM file should have weight 0. (Default: off)
498 Calculate 95% credibility intervals and posterior mean estimates. (Default: off)
500 =item B<--seed-length> <int>
502 Seed length used by the read aligner. Providing the correct value is important for RSEM. If RSEM runs Bowtie, it uses this value for Bowtie's seed length parameter. Any read with its or at least one of its mates' (for paired-end reads) length less than this value will be ignored. If the references are not added poly(A) tails, the minimum allowed value is 5, otherwise, the minimum allowed value is 25. Note that this script will only check if the value >= 5 and give a warning message if the value < 25 but >= 5. (Default: 25)
504 =item B<--tag> <string>
506 The name of the optional field used in the SAM input for identifying a read with too many valid alignments. The field should have the format <tagName>:i:<value>, where a <value> bigger than 0 indicates a read with too many alignments. (Default: "")
508 =item B<--bowtie-path> <path>
510 The path to the bowtie executables. (Default: the path to the bowtie executables is assumed to be in the user's PATH environment variable)
512 =item B<--bowtie-n> <int>
514 (Bowtie parameter) max # of mismatches in the seed. (Range: 0-3, Default: 2)
516 =item B<--bowtie-e> <int>
518 (Bowtie parameter) max sum of mismatch quality scores across the alignment. (Default: 99999999)
520 =item B<--bowtie-m> <int>
522 (Bowtie parameter) suppress all alignments for a read if > <int> valid alignments exist. (Default: 200)
524 =item B<--bowtie-chunkmbs> <int>
526 (Bowtie parameter) memory allocated for best first alignment calculation (Default: 0 - use bowtie's default)
528 =item B<--phred33-quals>
530 Input quality scores are encoded as Phred+33. (Default: on)
532 =item B<--phred64-quals>
534 Input quality scores are encoded as Phred+64 (default for GA Pipeline ver. >= 1.3). (Default: off)
536 =item B<--solexa-quals>
538 Input quality scores are solexa encoded (from GA Pipeline ver. < 1.3). (Default: off)
540 =item B<--forward-prob> <double>
542 Probability of generating a read from the forward strand of a transcript. Set to 1 for a strand-specific protocol where all (upstream) reads are derived from the forward strand, 0 for a strand-specific protocol where all (upstream) read are derived from the reverse strand, or 0.5 for a non-strand-specific protocol. (Default: 0.5)
544 =item B<--fragment-length-min> <int>
546 Minimum read/insert length allowed. This is also the value for the bowtie -I option. (Default: 1)
548 =item B<--fragment-length-max> <int>
550 Maximum read/insert length allowed. This is also the value for the bowtie -X option. (Default: 1000)
552 =item B<--fragment-length-mean> <double>
554 (single-end data only) The mean of the fragment length distribution, which is assumed to be a Gaussian. (Default: -1, which disables use of the fragment length distribution)
556 =item B<--fragment-length-sd> <double>
558 (single-end data only) The standard deviation of the fragment length distribution, which is assumed to be a Gaussian. (Default: 0, which assumes that all fragments are of the same length, given by the rounded value of B<--fragment-length-mean>)
560 =item B<--estimate-rspd>
562 Set this option if you want to estimate the read start position distribution (RSPD) from data. Otherwise, RSEM will use a uniform RSPD. (Default: off)
564 =item B<--num-rspd-bins> <int>
566 Number of bins in the RSPD. Only relevant when '--estimate-rspd' is specified. Use of the default setting is recommended. (Default: 20)
568 =item B<--ci-memory> <int>
570 Maximum size (in memory, MB) of the auxiliary buffer used for computing credibility intervals (CI). Set it larger for a faster CI calculation. However, leaving 2 GB memory free for other usage is recommended. (Default: 1024)
572 =item B<--keep-intermediate-files>
574 Keep temporary files generated by RSEM. RSEM creates a temporary directory, 'sample_name.temp', into which it puts all intermediate output files. If this directory already exists, RSEM overwrites all files generated by previous RSEM runs inside of it. By default, after RSEM finishes, the temporary directory is deleted. Set this option to prevent the deletion of this directory and the intermediate files inside of it. (Default: off)
576 =item B<--temporary-folder> <string>
578 Set where to put the temporary files generated by RSEM. If the folder specified does not exist, RSEM will try to create it. (Default: sample_name.temp)
582 Output time consumed by each step of RSEM to 'sample_name.time'. (Default: off)
586 Suppress the output of logging information. (Default: off)
590 Show help information.
596 In its default mode, this program aligns input reads against a reference transcriptome with Bowtie and calculates expression values using the alignments. RSEM assumes the data are single-end reads with quality scores, unless the '--paired-end' or '--no-qualities' options are specified. Users may use an alternative aligner by specifying one of the --sam and --bam options, and providing an alignment file in the specified format. However, users should make sure that they align against the indices generated by 'rsem-prepare-reference' and the alignment file satisfies the requirements mentioned in ARGUMENTS section.
598 One simple way to make the alignment file satisfying RSEM's requirements (assuming the aligner used put mates in a paired-end read adjacent) is to use 'convert-sam-for-rsem' script. This script only accept SAM format files as input. If a BAM format file is obtained, please use samtools to convert it to a SAM file first. For example, if '/ref/mouse_125' is the 'reference_name' and the SAM file is named 'input.sam', you can run the following command:
600 convert-sam-for-rsem /ref/mouse_125 input.sam -o input_for_rsem.sam
602 For details, please refer to 'convert-sam-for-rsem's documentation page.
604 The SAM/BAM format RSEM uses is v1.4. However, it is compatible with old SAM/BAM format. However, RSEM cannot recognize 0x100 in the FLAG field. In addition, RSEM requires SEQ and QUAL are not '*'.
606 The user must run 'rsem-prepare-reference' with the appropriate reference before using this program.
608 For single-end data, it is strongly recommended that the user provide the fragment length distribution parameters (--fragment-length-mean and --fragment-length-sd). For paired-end data, RSEM will automatically learn a fragment length distribution from the data.
610 Please note that some of the default values for the Bowtie parameters are not the same as those defined for Bowtie itself.
612 The temporary directory and all intermediate files will be removed when RSEM finishes unless '--keep-intermediate-files' is specified.
614 With the '--calc-ci' option, 95% credibility intervals and posterior mean estimates will be calculated in addition to maximum likelihood estimates.
620 =item B<sample_name.isoforms.results>
622 File containing isoform level expression estimates. The first line
623 contains column names separated by the tab character. The format of
624 each line in the rest of this file is:
626 transcript_id gene_id length effective_length expected_count TPM FPKM IsoPct [pme_expected_count pme_TPM pme_FPKM IsoPct_from_pme_TPM TPM_ci_lower_bound TPM_ci_upper_bound FPKM_ci_lower_bound FPKM_ci_upper_bound]
628 Fields are separated by the tab character. Fields within "[]" are only
629 presented if '--calc-ci' is set.
631 'transcript_id' is the transcript name of this transcript. 'gene_id'
632 is the gene name of the gene which this transcript belongs to (denote
633 this gene as its parent gene). If no gene information is provided,
634 'gene_id' and 'transcript_id' are the same.
636 'length' is this transcript's sequence length (poly(A) tail is not
637 counted). 'effective_length' counts only the positions that can
638 generate a valid fragment. If no poly(A) tail is added,
639 'effective_length' is equal to transcript length - mean fragment
640 length + 1. If one transcript's effective length is less than 1, this
641 transcript's both effective length and abundance estimates are set to
644 'expected_count' is the sum of the posterior probability of each read
645 comes from this transcript over all reads. Because 1) each read
646 aligning to this transcript has a probability of being generated from
647 background noise; 2) RSEM may filter some alignable low quality reads,
648 the sum of expected counts for all transcript are generally less than
649 the total number of reads aligned.
651 'TPM' stands for Transcripts Per Million. It is a relative measure of
652 transcript abundance. The sum of all transcripts' TPM is 1
653 million. 'FPKM' stands for Fragments Per Kilobase of transcript per
654 Million mapped reads. It is another relative measure of transcript
655 abundance. If we define l_bar be the mean transcript length in a
656 sample, which can be calculated as
658 l_bar = \sum_i TPM_i / 10^6 * effective_length_i (i goes through every transcript),
660 the following equation is hold:
662 FPKM_i = 10^3 / l_bar * TPM_i.
664 We can see that the sum of FPKM is not a constant across samples.
666 'IsoPct' stands for isoform percentage. It is the percentage of this
667 transcript's abandunce over its parent gene's abandunce. If its parent
668 gene has only one isoform or the gene information is not provided,
669 this field will be set to 100.
671 'pme_expected_count', 'pme_TPM', 'pme_FPKM' are posterior mean
672 estimates calculated by RSEM's Gibbs sampler. 'IsoPct_from_pme_TPM' is
673 the isoform percentage calculated from 'pme_TPM' values.
675 'TPM_ci_lower_bound', 'TPM_ci_upper_bound', 'FPKM_ci_lower_bound' and
676 'FPKM_ci_upper_bound' are lower(l) and upper(u) bounds of 95%
677 credibility intervals for TPM and FPKM values. The bounds are
678 inclusive (i.e. [l, u]).
680 =item B<sample_name.genes.results>
682 File containing gene level expression estimates. The first line
683 contains column names separated by the tab character. The format of
684 each line in the rest of this file is:
686 gene_id transcript_id(s) length effective_length expected_count TPM FPKM [pme_expected_count pme_TPM pme_FPKM TPM_ci_lower_bound TPM_ci_upper_bound FPKM_ci_lower_bound FPKM_ci_upper_bound]
688 Fields are separated by the tab character. Fields within "[]" are only
689 presented if '--calc-ci' is set.
691 'transcript_id(s)' is a comma-separated list of transcript_ids
692 belonging to this gene. If no gene information is provided, 'gene_id'
693 and 'transcript_id(s)' are identical (the 'transcript_id').
695 A gene's 'length' and 'effective_length' are
696 defined as the weighted average of its transcripts' lengths and
697 effective lengths (weighted by 'IsoPct'). A gene's abundance estimates
698 are just the sum of its transcripts' abundance estimates.
700 =item B<sample_name.transcript.bam, sample_name.transcript.sorted.bam and sample_name.transcript.sorted.bam.bai>
702 Only generated when --no-bam-output is not specified.
704 'sample_name.transcript.bam' is a BAM-formatted file of read
705 alignments in transcript coordinates. The MAPQ field of each alignment
706 is set to min(100, floor(-10 * log10(1.0 - w) + 0.5)), where w is the
707 posterior probability of that alignment being the true mapping of a
708 read. In addition, RSEM pads a new tag ZW:f:value, where value is a
709 single precision floating number representing the posterior
710 probability. Because this file contains all alignment lines produced
711 by bowtie or user-specified aligners, it can also be used as a
712 replacement of the aligner generated BAM/SAM file. For paired-end
713 reads, if one mate has alignments but the other does not, this file
714 marks the alignable mate as "unmappable" (flag bit 0x4) and appends an
715 optional field "Z0:A:!".
717 'sample_name.transcript.sorted.bam' and
718 'sample_name.transcript.sorted.bam.bai' are the sorted BAM file and
719 indices generated by samtools (included in RSEM package).
721 =item B<sample_name.genome.bam, sample_name.genome.sorted.bam and sample_name.genome.sorted.bam.bai>
723 Only generated when --no-bam-output is not specified and --output-genome-bam is specified.
725 'sample_name.genome.bam' is a BAM-formatted file of read alignments in
726 genomic coordinates. Alignments of reads that have identical genomic
727 coordinates (i.e., alignments to different isoforms that share the
728 same genomic region) are collapsed into one alignment. The MAPQ field
729 of each alignment is set to min(100, floor(-10 * log10(1.0 - w) +
730 0.5)), where w is the posterior probability of that alignment being
731 the true mapping of a read. In addition, RSEM pads a new tag
732 ZW:f:value, where value is a single precision floating number
733 representing the posterior probability. If an alignment is spliced, a
734 XS:A:value tag is also added, where value is either '+' or '-'
735 indicating the strand of the transcript it aligns to.
737 'sample_name.genome.sorted.bam' and 'sample_name.genome.sorted.bam.bai' are the
738 sorted BAM file and indices generated by samtools (included in RSEM package).
740 =item B<sample_name.time>
742 Only generated when --time is specified.
744 It contains time (in seconds) consumed by aligning reads, estimating expression levels and calculating credibility intervals.
746 =item B<sample_name.stat>
748 This is a folder instead of a file. All model related statistics are stored in this folder. Use 'rsem-plot-model' can generate plots using this folder.
754 Assume the path to the bowtie executables is in the user's PATH environment variable. Reference files are under '/ref' with name 'mouse_125'.
756 1) '/data/mmliver.fq', single-end reads with quality scores. Quality scores are encoded as for 'GA pipeline version >= 1.3'. We want to use 8 threads and generate a genome BAM file:
758 rsem-calculate-expression --phred64-quals \
760 --output-genome-bam \
765 2) '/data/mmliver_1.fq' and '/data/mmliver_2.fq', paired-end reads with quality scores. Quality scores are in SANGER format. We want to use 8 threads and do not generate a genome BAM file:
767 rsem-calculate-expression -p 8 \
772 mmliver_paired_end_quals
774 3) '/data/mmliver.fa', single-end reads without quality scores. We want to use 8 threads:
776 rsem-calculate-expression -p 8 \
780 mmliver_single_without_quals
782 4) Data are the same as 1). We want to take a fragment length distribution into consideration. We set the fragment length mean to 150 and the standard deviation to 35. In addition to a BAM file, we also want to generate credibility intervals. We allow RSEM to use 1GB of memory for CI calculation:
784 rsem-calculate-expression --bowtie-path /sw/bowtie \
786 --fragment-length-mean 150.0 \
787 --fragment-length-sd 35.0 \
789 --output-genome-bam \
796 5) '/data/mmliver_paired_end_quals.bam', paired-end reads with quality scores. We want to use 8 threads:
798 rsem-calculate-expression --paired-end \
801 /data/mmliver_paired_end_quals.bam \
803 mmliver_paired_end_quals