Biowulf High Performance Computing at the NIH
Fast and accurate HLA typing from short read sequence data on Biowulf

The HLA gene complex on human chromosome 6 is one of the most polymorphic regions in the human genome and contributes in large part to the diversity of the immune system. Accurate typing of HLA genes with short-read sequencing data has historically been difficult due to the sequence similarity between the polymorphic alleles. xHLA iteratively refines the mapping results at the amino acid level to achieve high typing accuracy for both class I and II HLA genes.


Important Notes

IMPORTANT NOTE: Before submitting a job running xHLA software to cluster, user(s) should estimate the amount of memory required for running the job by benchmarking their data.

Interactive job
Interactive jobs should be used for debugging, graphics, or applications that cannot be run as batch jobs.

Allocate an interactive session and run the program. Sample session:

[user@biowulf]$ sinteractive --mem=8g
[user@@cn3316 ~]$ module load xHLA
[user@@cn3316 ~]$ git clone
[user@@cn3316 ~]$ mkdir test_run
[user@@cn3316 ~]$ xhla --sample_id test --input_bam_path HLA/tests/test.bam --output_path test_run
[07/Feb/2018 15:09:25] INFO - Xie Chao's HLA typing algorithm
[07/Feb/2018 15:09:25] INFO - Sample_id: test Input file: HLA/tests/test.bam parameters: DELETE=false FULL=false
Extracting reads from S3
done lpsolve
 [1] "A*01:01"    "A*02:01"    "B*13:02"    "B*37:01"    "C*06:02"   
 [6] "DPB1*04:01" "DQB1*02:01" "DQB1*05:01" "DRB1*07:01" "DRB1*10:01"
pulling non-core exons in
  DQB1*02:01   DQB1*02:01 
"DQB1*02:02" "DQB1*02:12" 
named character(0)
refining solution
        allele rank
 1:    A*01:01  6.0
 2:    A*02:01  3.0
 3:    B*13:02 48.5
 4:    B*37:01 96.0
 5:    C*06:02 10.0
 6: DPB1*04:01   NA
 7: DQB1*02:02   NA
 8: DQB1*05:01 12.0
 9: DRB1*07:01  9.0
10: DRB1*10:01 72.5
     allele rank field1 field2
1:  A*01:01    6      1      1
2: A*01:01L   NA      1      1
3: A*01:01N   NA      1      1
4:  A*01:32   NA      1     32
5:  A*01:45   NA      1     45
6: A*01:56N   NA      1     56
7: A*01:103   NA      1    103
8: A*01:177   NA      1    177
[07/Feb/2018 15:18:50] INFO - Successfully wrote output file
[07/Feb/2018 15:18:50] INFO - HLA typing: shutting down.
[user@cn3144 ~]$ exit
salloc.exe: Relinquishing job allocation 46116226
[user@biowulf ~]$
Note that the command xhla will accept both the relative and absolute paths to the input data.

Batch job
Most jobs should be run as batch jobs.

Create a batch input file (e.g. For example:

module load xHLA
mkdir HLA/test
xhla --sample_id test --input_bam_path HLA/tests/test.bam --output_path HLA/test

Submit this job using the Slurm sbatch command.

sbatch [--cpus-per-task=#] [--mem=#]