細胞STR鑒定簡介：

細胞STR鑒定應(yīng)用于生物醫(yī)學(xué)研究領(lǐng)域的哺乳動物細胞被錯誤鑒定和交叉污染的問題，一直是一個普遍存在的突出問題。

據(jù)統(tǒng)計，國外實驗室有20%左右的細胞株被錯誤鑒定和交叉污染，NIH和ATCC近兩年都對此發(fā)出呼吁，要求研究者對細胞進行鑒定。近年來，大量研究表明STR基因分型方法是進行細胞交叉污染和性質(zhì)鑒定的*有效和準確的方法之一，STR基因分型應(yīng)用于細胞鑒定已被ATCC等機構(gòu)強烈推薦。美國的ATCC細胞庫、德國的DSMZ細胞庫以及日本的JCRB細胞庫等為STR分型提供了各細胞株的數(shù)據(jù)供比對。

STR（Short Tandem Repeat，短串聯(lián)重復(fù)序列）基因位點由長度為3-7個堿基對的短串連重復(fù)序列組成，這些重復(fù)序列廣泛存在于人類基因組中，可作為高度多態(tài)性標記，被稱為細胞的DNA指紋，其可通過PCR（聚合酶鏈式反應(yīng)）來檢測。STR基因座位上的等位基因可通過擴增區(qū)域內(nèi)重復(fù)序列的拷貝數(shù)的不同來區(qū)分，在毛細管電泳分離之后可通過熒光檢測來識別。隨后通過一定的計算方法，即可根據(jù)所得的STR分型結(jié)果與專業(yè)的細胞STR數(shù)據(jù)庫比對從而推算出樣品所屬的細胞系或可能的交叉污染的細胞系名稱。

細胞STR鑒定服務(wù)流程：

細胞STR鑒定樣本要求：

細胞系錯誤鑒定所造成的后果：

★ 細胞系的損失；

★ 時間和金錢的損失；

★ 在公眾領(lǐng)域（文獻、專li等）提供錯誤信息；

★ 造成實驗結(jié)果不一致或不可重復(fù)；

★ ……

何時需做細胞STR鑒定？

1、發(fā)表文章或申請課題經(jīng)費前；

2、使用細胞進行臨床治療（試驗）前；

3、準備凍存保種或已凍存多年的細胞；

4、一個涉及到細胞試驗項目開始/結(jié)束時；

5、新得到的細胞或?qū)嶒炇覀?代以上的細胞；

6、細胞系表現(xiàn)不穩(wěn)定或結(jié)果與預(yù)期差別較大。

已開始要求細胞鑒定的期刊：

★ Nature

★ BioTechniques

★ Cancer Research

★ Cancer Discovery

★ Clinical Cancer Research

★ Molecular Cancer Research

★ Cancer Prevention Research

★ International Journal of Cancer

★ Molecular Cancer Therapeutics

★ Cell Biochemistry and Biophysics

★ Cancer Epidemiology, Biomarkers & Prevention

★ In Vitro Cellular & Developmental Biology - Animal

★ ......

人源細胞STR位點信息：

為進一步提高鑒定的分辨率，除了包含ATCC檢測的8個STR和1個性別決定位點Amelogenin外，另新增了12個高度多態(tài)性位點，共檢測21個STR位點。

參考文獻：

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11. Smith, J.R. et al. (1995) Approach to genotyping errors caused by nontemplated nucleotide addition by Taq DNA polymerase. Genome Res. 5, 312-7.

12. Magnuson, V.L. et al. (1996) Substrate nucleotide-determined non-templated addition of adenine by Taq DNA polymerase: Implications for PCR-based genotyping. BioTechniques 21, 700-9.

13. Walsh, P.S., Fildes, N.J. and Reynolds, R. (1996) Sequence analysis and characterization of stutter products at the tetranucleotide repeat locus vWA. Nucleic Acids Res. 24, 2807-12.

14. Moller, A., Meyer, E. and Brinkmann, B. (1994) Different types of structural variation in STRs: HumFES/FPS, HumVWA and HumD21S11. Int. J. Leg. Med. 106, 319-23.

15. Brinkmann, B., Moller A. and Wiegand, P. (1995) Structure of new mutations in 2 STR systems. Int. J. Leg. Med. 107, 201-3.

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