JP5683964B2 - Snpアレイを用いた染色体、遺伝子または特定ヌクレオチド配列のコピー数測定方法 - Google Patents
Snpアレイを用いた染色体、遺伝子または特定ヌクレオチド配列のコピー数測定方法 Download PDFInfo
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Description
本発明の目的は、以下のステップ:(a)ホモ接合DNAを検体試料DNAと混合する工程;(b)該DNA混合物をSNPアレイで分析する工程;そして(c)ホモ接合DNAからのシグナルと検体試料DNAからのシグナルとの差異を測定して染色体、遺伝子または特定ヌクレオチド配列のコピー数を決定する工程とを含んでなる、染色体、遺伝子または特定ヌクレオチド配列のコピー数測定方法を提供することである。
一つの見地では、上記目的を達成するために、本発明は、以下のステップ:(a)ホモ接合DNAを検体試料DNAと混合する工程;(b)該DNA混合物をSNPアレイで分析する工程;そして(c)ホモ接合DNAからのシグナルと検体試料DNAからのシグナルとの差異を測定して、染色体、遺伝子または特定ヌクレオチド配列のコピー数を決定する工程とを含む、染色体、遺伝子または特定ヌクレオチド配列のコピー数測定方法に関する。
正常の検体試料DNAを単独で分析し、また正常の検体試料DNAとホモ接合DNAとの1:1混合物を分析した後、各アレルの相対的なシグナル強度を示した。正常な検体試料(normal)におけるアレルのシグナル強度は、図1の左側に示した。コピー数がトリソミーに変化した場合のアレルの相対的なシグナル強度を、図の右側に示した。ここで各DNA鎖の変化を図式化した。検体試料DNAとホモ接合DNAの全てのアレルに対する情報を分析した後、さらに本発明の方法に従って、各アレルをSNPアレイで分析した。コピー数の測定が可能な場合をoで表した。コピー数の測定が不可能な場合をxで表示した。pは、特定のアレルの相対的シグナル強度からはコピー数の増加または減少を決定することはできないが、変化したということは分かる場合であって、全シグナルの強度によって増加または減少を決定できる場合である。
各アレルの相対的シグナル強度として一つのアレルの欠失が認められ、この場合の各DNA鎖における欠失を分けて図式化した。検体試料のみをもってSNPアレイを実施したとき、一つのアレルの結果からは欠失したことを決定することができず、隣接したアレルの分析によって欠失の可能性を決定することができた。ところが、本発明の方法を用いた場合、各アレルを分析することができ、それによって欠失を決定することができ、さらに以前の方法に比べて分解能が激的に改善されることが分かる(図2)。
ホモ接合細胞株としての胞状奇胎細胞株のDNAと、21番染色体の3コピーを持つダウン症候群患者のDNAのそれぞれとを1:1で混合した後、SNPアレイを用いてコピー数を分析した。21番染色体とX染色体を除いた場合、SRが1:1、1:3、3:1であることを確認した。21番染色体はSRが2:3、3:2、1:4、4:1であることを確認した。ここでSRが2:3または3:2であることは、ダウン症候群患者における21番染色体が3コピーあることを示している(図4)。
ダウン症候群DNAと正常のコントロールDNAを試料として用い、これを胞状奇胎DNAとそれぞれ混合した(1:1)。次いでIllumina SNP array(317K Duo)を用いてSNP分析を実施した。胞状奇胎ではAAを示すものを、ダウン症候群ではBBを示すもののみを別途分析した。1番染色体および21番染色体から300個の対応するSNPsをそれぞれ抽出して分析した(図5)。その結果、21番染色体は、ダウン症候群において追加されており(3n)、正常な染色体(2n)である1番染色体とは、コピー数の状態において容易に区別された。
Claims (4)
- 以下の工程:
(a)ホモ接合DNAを検体試料DNAと混合する工程;
(b)該DNA混合物をSNPアレイで分析してSNPシグナルを測定する工程;そして
(c)該DNA混合物からのSNPアレルのシグナル比(SR)を測定して、検体試料中の染色体、遺伝子または特定ヌクレオチド配列中のコピー数変異(variations)を決定する工程
を含み、ホモ接合DNAのSNPアレルと検体試料DNAのSNPアレルとが異型のホモ接合アレルである、検体試料中の染色体、遺伝子または特定ヌクレオチド配列中のコピー数変異の測定方法。 - ホモ接合DNAが単為生殖細胞株または胞状奇胎細胞株のDNAであることを特徴とする、請求項1に記載の方法。
- (a)工程において、ホモ接合DNAを検体試料DNAと1:1の比率で混合することを特徴とする、請求項1に記載の方法。
- SNPアレイがレアSNPを測定するように考案されたSNPアレイであることを特徴とする、請求項1に記載の方法。
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PCT/KR2009/001111 WO2009113779A2 (ko) | 2008-03-11 | 2009-03-05 | Snp 어레이를 이용한 염색체, 유전자, 또는 특정 뉴클레오티드 서열의 카피 수 측정방법 |
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JP5888769B2 (ja) * | 2011-09-20 | 2016-03-22 | 国立大学法人京都大学 | 相同組換えにより遺伝子改変された多能性幹細胞の簡便な検出法 |
US11591637B2 (en) | 2012-08-14 | 2023-02-28 | 10X Genomics, Inc. | Compositions and methods for sample processing |
US10400280B2 (en) | 2012-08-14 | 2019-09-03 | 10X Genomics, Inc. | Methods and systems for processing polynucleotides |
CN113528634A (zh) | 2012-08-14 | 2021-10-22 | 10X基因组学有限公司 | 微胶囊组合物及方法 |
US9701998B2 (en) | 2012-12-14 | 2017-07-11 | 10X Genomics, Inc. | Methods and systems for processing polynucleotides |
US10752949B2 (en) | 2012-08-14 | 2020-08-25 | 10X Genomics, Inc. | Methods and systems for processing polynucleotides |
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US10323279B2 (en) | 2012-08-14 | 2019-06-18 | 10X Genomics, Inc. | Methods and systems for processing polynucleotides |
US10533221B2 (en) | 2012-12-14 | 2020-01-14 | 10X Genomics, Inc. | Methods and systems for processing polynucleotides |
KR20200140929A (ko) | 2013-02-08 | 2020-12-16 | 10엑스 제노믹스, 인크. | 폴리뉴클레오티드 바코드 생성 |
US10395758B2 (en) | 2013-08-30 | 2019-08-27 | 10X Genomics, Inc. | Sequencing methods |
US9824068B2 (en) | 2013-12-16 | 2017-11-21 | 10X Genomics, Inc. | Methods and apparatus for sorting data |
AU2015243445B2 (en) | 2014-04-10 | 2020-05-28 | 10X Genomics, Inc. | Fluidic devices, systems, and methods for encapsulating and partitioning reagents, and applications of same |
KR101663171B1 (ko) * | 2014-05-27 | 2016-10-14 | 이원 다이애그노믹스 게놈센타(주) | 다운증후군 진단을 위한 바이오마커 및 그의 용도 |
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CA2710807A1 (en) | 2009-09-17 |
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US9012370B2 (en) | 2015-04-21 |
AU2009224170B2 (en) | 2012-03-29 |
JP2011510626A (ja) | 2011-04-07 |
KR20090097792A (ko) | 2009-09-16 |
KR101030476B1 (ko) | 2011-04-25 |
EP2253713A4 (en) | 2012-03-21 |
WO2009113779A2 (ko) | 2009-09-17 |
EP2253713B1 (en) | 2015-02-25 |
CN101918597A (zh) | 2010-12-15 |
WO2009113779A3 (ko) | 2009-12-10 |
EP2253713A2 (en) | 2010-11-24 |
AU2009224170A1 (en) | 2009-09-17 |
CN101918597B (zh) | 2013-09-18 |
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