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[Tool] ArtDeCo tool ์ด์šฉํ•ด contamination ์•Œ์•„๋‚ด๊ธฐ

ํžˆ์Šคํ†ค 2024. 3. 22. 15:33

Sample contamination ์ด๋ž€ NGS ์‹คํ—˜ํ•˜๋Š” ์‚ฌ๋žŒ์ด๋ผ๋ฉด ๋ˆ„๊ตฌ๋‚˜ ํ•œ๋ฒˆ์ฏค ์ƒ๊ฐํ•ด๋ณผ๋ฒ•ํ•œ ์ด์Šˆ์ด๋‹ค.

์‹คํ—˜ํ•˜๋‹ค๊ฐ€ ์˜†์— well์— contam ๋˜๊ธฐ๋Š” ๋งค์šฐ ์‰ฝ์ง€๋งŒ, ์–ด๋–ค ์ƒ˜ํ”Œ์— ์˜ํ•ด contam์ด ๋˜์—ˆ๋Š”์ง€ ์•Œ์•„๋‚ด๊ธฐ๋Š” ์–ด๋ ต๋‹ค.

์ด๋Ÿฌํ•œ contamination issue๋ฅผ ํ•ด๊ฒฐํ•˜๊ธฐ ์œ„ํ•ด ๋ช‡๊ฐ€์ง€ tool์„ ์ฐพ์•„๋ณธ ๊ฒฐ๊ณผ ArtDeCo๋ผ๋Š” tool์„ ๋ฐœ๊ฒฌํ•˜์˜€๋‹ค.

 

1. ArtDeCo ๋ž€?

NGS๋ฅผ ์ด์šฉํ•œ DNA sample ์‚ฌ์ด์˜ cross-contamination์„ ์•Œ์•„๋‚ผ ์ˆ˜ ์žˆ๋„๋ก ๊ฐœ๋ฐœํ•œ tool ์ด๋‹ค.

์•„๋ž˜ ๋…ผ๋ฌธ์„ ๋ณด๋ฉด batch ๋‚ด ์ƒ˜ํ”Œ๋“ค์—๊ฒŒ์„œ ์ค‘๋ณต๋˜๋Š” SNV์˜ AR(Alleic ratio) ํ™•์ธํ•˜์—ฌ ์ƒ˜ํ”Œ๋“ค์˜ Contamination์„ ํ™•์ธํ•œ๋‹ค.

 

https://bmcbioinformatics.biomedcentral.com/articles/10.1186/s12859-020-03551-0

 

ARTDeco: automatic readthrough transcription detection - BMC Bioinformatics

Background Mounting evidence suggests several diseases and biological processes target transcription termination to misregulate gene expression. Disruption of transcription termination leads to readthrough transcription past the 3โ€ฒ end of genes, which ca

bmcbioinformatics.biomedcentral.com

 

์•Œ๊ณ ๋ฆฌ์ฆ˜์— ๋Œ€ํ•ด ์ข€ ๋” ์ž์„ธํžˆ ์„ค๋ช…ํ•˜์ž๋ฉด WCS ์˜ percentage of contaminaiton์„ ํ†ตํ•ด contamiantion ์„ ์ฐพ๋Š”๋‹ค.

โ€ข WCS(Worst case scenario)=max((r*2);(1-a)*2)
1. WCS percentage of contamination >= 1% ์ธ ๊ฒฝ์šฐ, contamination ์žˆ๋‹ค๊ณ  ์˜ˆ์ธก
 
2. ์˜ค์—ผ ํ™•์ธ์„ ์œ„ํ•ด contamination sample์˜ ์‹๋ณ„ํ•จ. ร contamination sample๊ณผ ๋‹ค๋ฅธ sample์˜ genotype์„ ๋น„๊ตํ•จ (์˜ค์—ผ์ƒ˜ํ”Œ์˜ homozygous SNP๋งŒ ์‚ฌ์šฉ๋˜๋ฉฐ, hetero SNP๋Š” variability๊ฐ€ ์žˆ์œผ๋ฏ€๋กœ ์ œ์™ธ. ์ฆ‰, Ref/Ref ์™€ Alt/Alt ์™€ ๊ฐ™์€ homozygous SNP ๋งŒ ์ด์šฉ)

 

3. AR<0.25, ๋˜๋Š” >0.75 ๋งŒ ์‚ฌ์šฉํ•˜์˜€๋‹ค. (์˜ค์—ผ๋˜์—ˆ๊ฑฐ๋‚˜, ์˜ค์—ผ๋˜์ง€ ์•Š์•˜์ง€๋งŒ noise ์กด์žฌํ•˜๋Š” SNP ํฌํ•จ(<0.005, >0.995))

 

2. Tool ์‚ฌ์šฉ๋ฒ•

ArtDeCo๋ฅผ ์‚ฌ์šฉํ•˜๊ธฐ ์œ„ํ•ด์„œ๋Š” ๋ช‡๊ฐ€์ง€ input์ด ํ•„์š”ํ•˜๋‹ค.

ํฌ๊ฒŒ 2๊ฐ€์ง€ ํŒŒ์ผ์ด ํ•„์š”ํ•œ๋ฐ, 1. SNP ์ •๋ณด๊ฐ€ ์žˆ๋Š” ํŒŒ์ผ, 2.coverage input ์ด๋ ‡๊ฒŒ ํ•„์š”ํ•˜๋‹ค.

๊ทธ๋ฆฌ๊ณ  ๋งˆ์ง€๋ง‰์— output ํŒŒ์ผ ๊ฒฝ๋กœ๋„ ์จ์ฃผ๋ฉด ์ข‹๋‹ค.

 

1.SNP ์ •๋ณด ํŒŒ์ผ

SNP ์ •๋ณดํŒŒ์ผ์€ 1000Genome, KRGDB์™€ ๊ฐ™์ด reference๋กœ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋Š” SNP reference ํŒŒ์ผ์ด ํ•„์š”ํ•˜๋‹ค.

๋…ผ๋ฌธ์—์„œ๋Š” 1000Genome database๋ฅผ ์‚ฌ์šฉํ•˜์˜€๋‹ค.

2.coverage input

coverage inputํŒŒ์ผ์€ bamํŒŒ์ผ์„ ์ด์šฉํ•˜์—ฌ depth ๋ฅผ ๊ณ„์‚ฐํ•ด์„œ ๊ฐ base์˜ coverage๋ฅผ ๋งŒ๋“ค์–ด์ค˜์•ผํ•œ๋‹ค.

์ด๋•Œ GATK์˜ depth of coverage๋ฅผ ์‚ฌ์šฉํ•˜์˜€๋‹ค.

 

์œ„์˜ ํŒŒ์ผ๋“ค์ด ์ค€๋น„๋˜์—ˆ์œผ๋ฉด ์•„๋ž˜์™€ ๊ฐ™์€ Command๋กœ ArtDeCo๋ฅผ ์‹คํ–‰ํ•˜๋ฉด ๋œ๋‹ค.