ES2610588T3 - Composiciones y métodos para la detección de aberraciones cromosómicas con tampones de hibridación novedosos - Google Patents
Composiciones y métodos para la detección de aberraciones cromosómicas con tampones de hibridación novedosos Download PDFInfo
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Abstract
Composición de hibridación para hibridación in situ, que comprende: (a) una sonda molecular que detecta una secuencia de nucleótidos desnaturalizada asociada con una aberración cromosómica; (b) al menos un disolvente aprótico polar en una concentración de desde el 1% (v/v) hasta el 30% (v/v), preferiblemente de desde el 10% (v/v) hasta el 20% (v/v); en la que el disolvente aprótico polar tiene funcionalidad lactona, sulfona, sulfito, nitrilo y/o carbonato; y (c) una disolución de hibridación, en la que dicha disolución de hibridación comprende uno o más componentes seleccionados del grupo que consiste en agentes tamponantes, agentes quelantes, sales, detergentes y agentes de bloqueo; y al menos un agente acelerante seleccionado del grupo que consiste en FICOLL, PVP, heparina, sulfato de dextrano, proteínas tales como BSA, glicoles tales como etilenglicol, glicerol, 1,3-propanodiol, glicerol, propilenglicol o dietilenglicol, combinaciones de los mismos tales como disolución de Dernhardt y BLOTTO, y disolventes orgánicos tales como formamida y dimetilformamida y DMSO; en la que la composición contiene menos del 10% de formamida; y en la que la secuencia de nucleótidos es un marcador para una aberración cromosómica en hibridación in situ.
Description
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sonda que detecta HER2 puede aparearse con una sonda que detecta CEN-17.
Las dianas para sondas a modo de ejemplo que pueden usarse en las composiciones y los métodos de la invención para detectar enfermedades no hematológicas incluyen, por ejemplo, BASE, BRCA1, CCND1, CCNE1, DCD, E2F3, n-MYC/MYCN, COX-2/PTGS2, LRIG1, ER a, hTERT, MLN64/ STARD3, PGR, SNAI1, SRC, TOP1, TUBB1, AIB1, DLC-1, EDD, Pip4k2b/5k, Sil, TBX2, c-Kit, VEGF, VCAM-1, Tie-1, Ts/TYMS, PSMA, PSA, PAP, P15, P16, BCL1, BCL2, MTOR, TIMP1, ESR1, PTEN, MDM2/CDK4, MET, C-MET, ERB1, FGFR1, IGF1R, NET, FGFR3, ABCB1, TMPRSS2, BRCA2, TOP2B, ERCC1, AKT1, AKT2, AKT3, HRAS, NRAS, RAF1, HER3, HER4, ENT1, RRM1, RRM2, RRM2B, PIK3CA, AURK4, AURKB, AURKC, MAPT/tau, TTBK1, TUBB, VEGFR, CCND3, CDK6, CDK2, CDC2, HDAC, ESR2, SCUBE2, BIRC5, FASN, DHFR, TP/ECGF1, TYMP, DPYD, TK1, HMGIC, ABCA2, ABCB11, ABCC1, ABCC2, ABCC3, ABCC4, ABCC5, ABCG2, MVP, ATP7A, ATP7B, SLC29A1, SLC28A1, SLC19A1, TUBB4, TUBA, MAP4, MAP7, STMN1, KIF5B, HSPA5, PSMD14, FPGS, GSTP1, GPX, GCLC, GGT2, MT, AKR1B1, HMGB1, HMGB2, XPA, XPD, MSH2, MLH1, PMS2, APEX1, MGMT, GLO1, RB1, GML, CDKN1A, CDKN2A, CDKN1B, ERBB2, KRAS2, ITGB 1, JUN, FOS, NFKB 1, TP53, TP73, BCL2L1, MCL1, BAX, BIRC4, TNFRSF6, CASP3, CASP8, HSPB1, MALAT1(alfa) t(11;19)(q11;q13.4), MHLB1 t(11;19)(q11;q13.4), COL1A1 t(17;22)(q22;q13), PDGFB
- t(17;22)(q22;q13),
- FKHR t(2;13) & t(1;13), ETV6 t(12;15)(p13;q25), NTRK3 t(12;15)(p13;q25), TLS/FUS
- t(12;16)(q13;p11),
- CHOP t(12;16)(q1 3;p11), EWS t(12;22)(q13;q12), EWS/FLI1 t(11;22)(q24;q12) y FLI1
- t(11;22)(q24;q12).
Las dianas para sondas a modo de ejemplo que pueden usarse en las composiciones y los métodos de la invención para detectar enfermedades hematológicas incluyen, por ejemplo, sondas para detectar dianas de enfermedades mieloproliferativas crónicas tales como, por ejemplo, ABL t(9;22)(q34;q11), PRDM16 del(lp36.32), del(21q22.12), RUNX1/AML1 del(1p36.32), del(21q22.12), CEP8, PDGFRB, NUP98, FGFR1 y ASS; sondas para detectar dianas de leucemia mieloide aguda tales como, por ejemplo, ETO t(8;21)(q22;q22), AML1 t(8;21)(q22;q22), CBFbeta inv(16)(p13q22) o t(16;16)(p13;q22), MYH11 inv(16)(p13q22) o t(16;16)(p13;q22), AF9 t(9;11), PML t(15;17)(q22;q21), PLZF t(11;17)(q23;q21), NuMA t(11;17)(q13;q21), NPM t(5;17)(q23;q12), RAR alfa t(15;17)(q22;q21) t(11;17)(q23;q21) t(11;17)(q13;q21) t(5;17)(q23;q21), EVI1 t(3;v)(q26;v), GR6 t(3;3)(q21;q26), RPN1 t(3;3)(q21;q26), DEK t(6;9), PUEDEN t(6;9), MLF1 t(3;5)(...;q23), FUS t(16;21), ERG t(16;21), NUP98 t(7;11), HOX9A t(7;11), MOZ/MYST3 t(8;16)(p11;p13), CBP t(8;16)(p11;p13), p300 t(8;22)(p11;q13), TIF2/GRIP-1/NCoA-2 inv(8)(p11q13) y MKL1; sondas para detectar dianas de neoplasias de células T y B precursoras, tales como, por ejemplo, PBX1 t(1;19)(q23;p13.3) + var., ABL t(9;22)(q34;q11), AF4/AFF1 t(4;11)(q21;q23), AML1/RUNX1 t(12;21)(p13;q22), IL3 t(5;14)(q31;q32), HLF t(17;19), IKZF1 del(7)(p12,2), CDKN2A/CDKN2B del(9)(p21.3), TAL1 1p32 aberraciones, LMO2 t(11;14)(p13;q11) + var., LMO1 t(11;14)(p15;q11), HOX11 t(10;14)(q24;q11) + var., TAL2 t(7;9)(q34;q32) y TAN1 t(7;9)(q34;q34); sondas para detectar dianas de neoplasias de células B maduras, tales como, por ejemplo, CEP12, ATM, D13S25, D13S319, TP53, P53, TNFAIP3 del(6)(q23,3-q24,1), CDK6 BCL1 t(11;14)(q13;q32) + var., IRF4 t(6;14)(p25;q32), C-MAF t(14;16)(q32;q23), FGFR3 t(4;14)(p16;q32) y MUM2/3 t(1;14)(q21;q32); y sondas para detectar dianas de neoplasias de células NK y células T maduras, tales como, por ejemplo, NPM t(2;5)(p23;q35), ASS, RB1 y ATM.
Las dianas para sondas a modo de ejemplo que pueden usarse en las composiciones y los métodos de la invención para detectar centrómeros incluyen, por ejemplo, CEP1, CEP2, CEP3, CEP4, CEP5, CEP6, CEP7, CEP8, CEP9, CEP10, CEP11, CEP12, CEP13, CEP14, CEP15, CEP16, CEP17, CEP18, CEP19, CEP20, CEP21, CEP22, CEP23, CEP XyCEP Y.
Las dianas para sondas a modo de ejemplo que pueden usarse en las composiciones y los métodos de la invención también incluyen, por ejemplo, CEP 18 (18p11.1-q11.1), CEP X (Xp11.1-q11.1), CEP Y (Yp11.1-q11.1), LSI 13 (13q14), LSI 21 (21q22,13-q22,2), CEP 3 (3p11.1-q11.1), CEP 7 (7p11.1-q11.1), LSI (p16 9p21), CEP 17 (17p11.1q11.1), CEP 1 (D1Z5) 1p11.1-q11,1, CEP 11q12, CEP 2 (D2Z1) 2p11.1-q11.1, CEP 3 (D3Z1) 3p11.1-q11.1, CEP 4 4p11-q11. CEP 6 (D6Z1) 6p11.1-q11. CEP 6 (D6Z1) 6p11.1-q11.1, CEP 7 (D7Z1) 7p11.1-q11.1, CEP 8 (D8Z2) 8p11.1-q11.1, CEP 9 9p11-q11. CEP 10 10p11.1-q11.1, CEP 11 (D11Z1) 11p11.11-q11.11. CEP 11 (D11Z1) 11p11.11-q11. CEP 12 (D12Z3) 12p11.1-q11. LSI 13 (13q4), LSI 13 (RB1), CEP 15 (D15Z1) 15p11.2, CEP 15 (D15Z4) 15p11.1-q11.1, CEP 16 (D16Z3) 16q11.2, CEP 17 (D17Z1) 17p11.1-q11.1, CEP 18 (D18Z1) 18p11.1-q11.1, CEP 20 (D20Z1) 20p11.1-q11.1, LSI 21, LSI 22 (BCR), CEP X (DXZ1)Xp11.1-q11.1, CEP X (DXZ1)/Y (DYZ1)* Xp11.1-q11.1 Yq12, CEP X (DXZ1)/Y (DYZ3) Xp11.1-q11.1 Yp11.1-q11.1, CEP Y (DYZ1) Yq12, CEP Y (DYZ1), CEP Y (DYZ3) Yp11.1-q11.1, LSI 1p36 / LSI 1q25 y LSI 19q13/19p13, LSI 4q12, LSI 9q34, LSI 13 (RB1) 13q14, LSI 13 (RB1), LSI (13q34), LSI 13 (13q14), LSI 21, LSI 22 (BCR), LSI ALK, LSI AML1/ETO, gen del receptor de andrógenos LSI (Xq12), LSI API2/MALT1 t(11;18) (q21;q21), LSI ATM (11q22.3), LSI ATM / CEP 11, LSI BCL2, LSI BCR/ABL + 9q34, LSI BCR/ABL, LSI CBFB, LSI CCND1 (11q13), LSI CHOP (12q13), LSI CSF1R (5q33-q34) / D5S23,D5S721, LSI C-MYC (8q24.12-q24.13), D1 de ciclina LSI (11q13) / CEP 11, LSI D13S25 (13q14.3), LSI D13S319 (13q14.3), LSI D13S319 (13q14.3) / LSI 13q34, LSI D20S108 (20q12), LSI D5S23/D5S721, CEP9, CEP15, LSI D7S486 (7q31) / CEP 7, LSI D7S522 (7q31) / CEP 7, LSI EGFR / CEP 7, LSI EGR1 (5q31) / D5S23, D5S721, LSI ETV6 (TEL) (12p13), LSI EWSR1 (22q12), LSI FKHR (13q14), LSI FUS (16p11), LSI IGH, LSI IGH/BCL2, LSI IGH/CCND1, LSI IGH/FGFR3, LSI IGH/MAF, LSI IGH/MALT1 t(14;18) (q32;q21), LSI IGHIMYC, CEP 8, LSI MALT1 (18q21), LSI MLL, LSI MYB (6q23), LSI MYC, LSI N-MYC (2p24,1), LSI N-MYC(2p24)/CEP 2 S, LSI p16 (9p21) /CEP 9, LSI p53 (17p13,1), LSI p53 / LSI ATM y LSI D13S319 / LSI 13q34 / CEP 12, LSI PML/RARA, LSI PTEN (10q23) / CEP 10, LSI RARA, LSI SYT (18q11.2), LSI TEL/AML1, LSI TCF3/PBX1, LSI TCR alfa/delta, LSI TOP2A, LSI TP53 / CEP 17, LSI ZNF217 (20q13.2), LSI p58 (1p36) LSI 1q25, LSI D5S23, D5S721, LSI EGR1/LSI D5S23, D5S721, LSI
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Tabla 2
- Disolvente
- D P H
- Acetanilida
- 20,6 13,3 12,4
- N-Acetil-pirrrolidona
- 17,8 13,1 8,3
- 4-Aminopiridina
- 20,4 16,1 12,9
- Benzamida
- 21,2 14,7 11,2
- Bencimidazol
- 20,6 14,9 11,0
- 1,2,3-Benzotriazol
- 18,7 15,6 12,4
- Dióxido de butadieno
- 18,3 14,4 6,2
- Carbonato de 2,3-butileno
- 18,0 16,8 3,1
- Caprolactona (épsilon)
- 19,7 15,0 7,4
- Anhídrido cloromaleico
- 20,4 17,3 11,5
- 2-Clorociclohexanona
- 18,5 13,0 5,1
- Cloronitrometano
- 17,4 13,5 5,5
- Anhídrido citracónico
- 19,2 17,0 11,2
- Crotonolactona
- 19,0 19,8 9,6
- Ciclopropilnitrilo
- 18,6 16,2 5,7
- Sulfato de dimetilo
- 17,7 17,0 9,7
- Dimetilsulfona
- 19,0 19,4 12,3
- Dimetilsulfóxido
- 18,4 16,4 10,2
- 1,2-Dinitrobenceno
- 20,6 22,7 5,4
- 2,4-Dinitrotolueno
- 20,0 13,1 4,9
- Difenilsulfona
- 21,1 14,4 3,4
- 1,2-Dinitrobenceno
- 20,6 22,7 5,4
- 2,4-Dinitrotolueno
- 20,0 13,1 4,9
- Difenilsulfona
- 21,1 14,4 3,4
- Cloruro de etanosulfonilo
- 17,7 14,9 6,8
- Furfural
- 18,6 14,9 5,1
- 2-Furonitrilo
- 18,4 15,0 8,2
- Isoxazol
- 18,8 13,4 11,2
- Anhídrido maleico
- 20,2 18,1 12,6
- Malononitrilo
- 17,7 18,4 6,7
- 4-Metoxibenzonitrilo
- 19,4 16,7 5,4
- 1-Metoxi-2-nitrobenceno
- 19,6 16,3 5,5
- 1-Metil-imidazol
- 19,7 15,6 11,2
- 3-Metil-isoxazol
- 19,4 14,8 11,8
- N-Óxido de N-metil-morfolina
- 19,0 16,1 10,2
- Metil-fenilo-sulfona
- 20,0 16,9 7,8
- Metil-sulfolano
- 19,4 17,4 5,3
- 4-Toluenosulfonato de metilo
- 19,6 15,3 3,8
- 3-Nitroanilina
- 21,2 18,7 10,3
- 2-Nitrotiofeno
- 19,7 16,2 8,2
- 9,10-Fenantrenoquinona
- 20,3 17,1 4,8
- Anhídrido ftálico
- 20,6 20,1 10,1
- 1,3-Propanosultona
- 18,4 16,0 9,0
- beta-Propiolactona
- 19,7 18,2 10,3
- Sacarina
- 21,0 13,9 8,8
- Succinonitrilo
- 17,9 16,2 7,9
- Sulfanilamida
- 20,0 19,5 10,7
- Sulfolano
- 20,3 18,2 10,9
- 2,2,6,6-Tetraclorociclohexanona
- 19,5 14,0 6,3
- Tiazol
- 20,5 18,8 10,8
- 3,3,3-Tricloropropeno
- 17,7 15,5 3,4
- 1,1,2-Tricloropropeno
- 17,7 15,7 3,4
- 1,2,3-Tricloropropeno
- 17,8 15,7 3,4
La tabla 2 expone una lista a modo de ejemplo de posibles productos químicos para su uso en las composiciones y los métodos de la invención basándose en sus parámetros de solubilidad de Hansen. Otros compuestos, naturalmente, también pueden satisfacer estos requisitos. Algunos de estos productos químicos se han usado en disoluciones en hibridación y/o PCR en la técnica anterior (por ejemplo, se ha usado dimetilsulfóxido (DMSO) en disoluciones de hibridación y PCR, y se ha usado sulfolano (SL) en disoluciones de PCR), pero la mayor parte no. Sin embargo, la técnica anterior no reconocía que estos compuestos puedan usarse ventajosamente para disminuir
17
los tiempos y/o las temperaturas de hibridación, tal como se dan a conocer en esta solicitud. Tabla 3
- Producto químico (momento dipolar)
- RED Punto de fusión, ºC
- Carbonato de cloroetileno (4,02)
- 0,92 -
- 2-Oxazolidinona (5,07)
- 0,48 86-89
- 2-Imidazol
- 1,49 90-91
- 1,5-Dimetil-tetrazol (5,3)
- ∼1,5 70-72
- N-Etil-tetrazol (5,46)
- ∼1,5
- Dióxido-sulfuro de trimetileno (4,49)
- - -
- Sulfuro de trimetileno (3,63)
- - -
- 1,3-Dimetil-5-tetrazol (4,02)
- - -
- Piridazina (3,97)
- 1,16 -8
- 2-Tiouracilo (4,21)
- - -
- N-Metil-imidazol (6,2)
- 1,28 -
- 1-Nitroso-2-pirolidinona
- ∼1,37 -
- Etilfosfinato de etilo (3,51)
- - -
- 5-ciano-2-Tiouracilo (5,19)
- - -
- 4H-Piran-4-tiona (4,08)
- 1,35 32-34
- 4H-Piran-4-ona = gamma-pirona (4,08)
- 1,49 Punto de ebullición (P.E.) 80
- 2-Nitrofurano (4,41)
- 1,14 29
- Alfa-Bromotetronato de metilo (6,24)
- - -
- Óxido de tetrahidrotiapirano (4,19)
- 1,75 60-64
- Picolinonitrilo (2-cianopiridina) (5,23)
- 0,40 26-28 (P.E. 212-215)
- Nitrobencimidazol (6,0)
- 0,52 207-209
- Isatina (5,76)
- - 193-195
- N-fenil-sidnona (6,55)
- - -
- Sulfato de glicol (etilenglicol) Nota: no es soluble al 40%
- - 99ºC
No todos los productos químicos enumerados en las tablas 2 y 3 son adecuados para su uso en las composiciones y los métodos de la invención. Por ejemplo, aunque se enumera el DMSO en la tabla 2 debido a que sus parámetros 5 de solubilidad de Hansen (HSP) se encuentran dentro de los intervalos citados anteriormente, el DMSO no funciona disminuyendo los tiempos y/o las temperaturas de hibridación en las composiciones y los métodos de la invención. Por tanto, en algunas realizaciones, la composición acuosa no contiene DMSO como disolvente aprótico polar. Sin embargo, está muy dentro de los conocimientos del experto habitual examinar compuestos adecuados usando la orientación proporcionada en el presente documento incluyendo someter a prueba un compuesto en uno de los 10 ejemplos proporcionados. Por ejemplo, en algunas realizaciones, los disolventes apróticos polares adecuados tendrán HSP dentro de los intervalos citados anteriormente y una estructura mostrada en las fórmulas 1-9 anteriores.
(2) Composiciones, tampones y disoluciones
(a) Disoluciones de hibridación
Se conocen en la técnica disoluciones de hibridación tradicionales. Tales disoluciones pueden comprender, por 15 ejemplo, agentes tamponantes, agentes acelerantes, agentes quelantes, sales, detergentes y agentes de bloqueo.
Por ejemplo, los agentes tamponantes pueden incluir SSC, HEPES, SSPE, PIPES, TMAC, TRIS, SET, fosfato de potasio, ácido cítrico, pirofosfato de sodio, etc. Los agentes tamponantes pueden estar presentes a concentraciones de desde 0,5x hasta 50x. Normalmente, los agentes tamponantes están presentes a concentraciones de desde 2x hasta 10x.
20 Los agentes acelerantes pueden incluir polímeros tales como FICOLL, PVP, heparina, sulfato de dextrano, proteínas tales como BSA, glicoles tales como etilenglicol, glicerol, 1,3-propanodiol, glicerol, propilenglicol o dietilenglicol, combinaciones de los mismos tales como disolución de Dernhardt y BLOTTO, y disolventes orgánicos tales como formamida, dimetilformamida, DMSO, etc. El agente acelerante puede estar presente a concentraciones de desde el 1% hasta el 80% o de 0,1x a 10x. Normalmente, está presente formamida a concentraciones de desde el 25% hasta
25 el 75%, mientras que están presentes DMSO, sulfato de dextrano y glicol a concentraciones de desde el 5% hasta el 10%.
Los agentes quelantes pueden incluir EDTA, EGTA, etc. Los agentes quelantes pueden estar presentes a concentraciones de desde 0,1 mM hasta 10 mM. Normalmente, los agentes quelantes están presentes a concentraciones de desde 0,5 mM hasta 5 mM.
30 Las sales pueden incluir cloruro de sodio, fosfato de sodio, fosfato de magnesio, etc. Las sales pueden estar
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Las señales puntuadas como “3” eran claramente visibles en un objetivo de 20x. B.G.: fondo.
Ejemplo 15
Este ejemplo compara la intensidad de señal y el fondo de muestras tratadas con las composiciones de la invención en función del agente de bloqueo.
Composiciones de sonda para FISH: EC al 15%; sulfato de dextrano al 20%; NaCl 600 mM; tampón fosfato 10 mM; sonda de ADN de HER2 marcada con Texas Red 2,5 ng/µl (1/4 de la concentración convencional) y ½ de la concentración convencional (300 nM) de sonda de PNA de CEN17 marcada con FITC. Se bloquearon las muestras con: (a) nada; (b) COT1 0,1 µg/µl (15279-011, Invitrogen); (c) COT1 0,3 µg/µl; o (d) ADN humano total 0,1 µg/µl antes de la hibridación usando las composiciones de la invención.
Estaban presentes todas las muestras como monofase. Se incubaron las sondas para FISH a 82ºC durante 5 min y luego a 45ºC durante 60 minutos.
Resultados:
- Agente de bloqueo
- Fondo Intensidad de señal ADN PNA
- Nada
- +1-1,5 3 2,5
- COT1 0,1 µg/µl
- +1 3 2,5
- COT1 0,3 µg/µl
- +1,5 3 2,5
- ADN humano total 0,1 µg/µl
- +0,5 3 2,5
NOTA: Los niveles de fondo sin bloqueo son significativamente menores que lo que se observa normalmente mediante FISH convencional sin bloqueo. En cambio, si una composición para FISH convencional no contiene un agente de bloqueo, normalmente no pueden leerse las señales.
Ejemplo 16
Este experimento compara diferentes modos de eliminación de la tinción de fondo usando las composiciones de la invención. Todas las composiciones contenían EC al 15%, sulfato de dextrano al 20%, NaCl 600 mM, tampón fosfato 10 mM,
sondas de ADN de HER2 2,5 ng/µl (1/4 de la concentración convencional), sonda de PNA de CEN17 300 nM (1/2 de
la concentración convencional), y uno de los siguientes agentes de reducción del fondo: A) PNA de bloqueo 5 µM (véase Kirsten Vang Nielsen et al., PNA Suppression Method Combined with Fluorescence In Situ Hybridisation (FISH) Technique inPRINS and PNA Technologies in Chromosomal Investigation, capítulo 10 (Franck Pellestor ed.) (Nova Science Publishers, Inc. 2006))
B) ADN de COT-1 0,1 µg/µl
C) ADN humano total (THD) 0,1 µg/µl (THD no marcado sonicado)
D) ADN de esperma de salmón fragmentado 0,1 µg/µl (AM9680, Ambion)
E) ADN de timo de ternero 0,1 µg/µl (D8661, Sigma)
F) ADN de esperma de arenque 0,1 µg/µl (D7290, Sigma)
G) formamida al 0,5%
H) formamida al 2%
I) etilenglicol al 1% (1.09621, Merck)
J) glicerol al 1% (1.04095, Merck)
K) 1,3-propanodiol al 1% (533734, Aldrich)
L) H2O al 1% (control)
Estaban presentes todas las muestras como monofase. Se incubaron las sondas a 82ºC durante 5 minutos y luego a
45ºC con secciones tisulares FFPE durante 60 y 120 minutos. Resultados:
36
- Bloqueo del fondo
- Hibridación/min Fondo Intensidad de señal ADN PNA
- PNA de bloqueo
- 60 +1 3 2,5
- PNA de bloqueo
- 120 +1-1,5 3 2,5
- COT-1
- 60 +0,5 3 2,5
- COT-1
- 120 +0-0,5 3 2,5
- THD
- 60 +0 3 3
- THD
- 120 +0,5 3 2,5
- ADN de esperma de salmón
- 60 +0 3 3
- ADN de esperma de salmón
- 120 +0 3 3
- ADN de timo de ternero
- 60 +0 2,5 3
- ADN de timo de ternero
- 120 +0,5 3 2,5
- ADN de esperma de arenque
- 60 +0 3 3
- ADN de esperma de arenque
- 120 +0,5 2,5 3
- Formamida al 0,5%
- 60 +0 2,5 3
- Formamida al 0,5%
- 120 +0 3 3
- Formamida al 2%
- 60 +0,5 2,5 3
- Formamida al 2%
- 120 +0,5 3 3
- Etilenglicol al 1%
- 60 +0,5 2,5 3
- Etilenglicol al 1%
- 120 +1,5 3 2,5
- Glicerol al 1%
- 60 +0,5 0,5 3
- Glicerol al 1%
- 120 +1 3 2,5
- 1,3-Propanodiol al 1%
- 60 +0 3 2,5
- 1,3-Propanodiol al 1%
- 120 +1 3 2,5
- Nada
- 60 +1 2,5 2,5
- Nada
- 120 +1,5 3 2,5
NOTA: todos los agentes de reducción del fondo, excepto PNA de bloqueo, mostraron un efecto en la reducción del fondo. Por tanto, no se requiere un bloqueo específico contra secuencias de ADN repetitivas.
Ejemplo 17
Este experimento compara la intensidad de señal de las fases superior e inferior usando dos disolventes apróticos 5 polares diferentes.
Composición de la sonda para FISH I: sulfato de dextrano al 10%, NaCl 300 mM, tampón fosfato 5 mM, tritiocarbonato de etileno (ET) al 40% (E27750, Aldrich), PNA de bloqueo 5 µM, sonda de ADN del gen CCND1 marcada con Texas Red 10 ng/µl.
Composición de la sonda para FISH II: sulfato de dextrano al 10%, NaCl 300 mM, tampón fosfato 5 mM, sulfito de 10 glicol (GS) al 40% (G7208, Aldrich), PNA de bloqueo 5 µM, sonda de ADN del gen CCND1 marcada con Texas Red 10 ng/µl.
Se incubaron las sondas para FISH a 82ºC durante 5 min y luego a 45ºC durante 60 minutos.
Resultados:
- Intensidad de señal
- I (ET)
- II (GS)
- Fase superior
- 1,5 0
- Fase inferior
- 0 3
- Mezcla de fases superior e inferior
- 2,5 3
Ejemplo 18. 15 Este experimento examina la capacidad de diversos disolventes apróticos polares para formar un sistema monofásico. Todas las composiciones contenían: sulfato de dextrano al 20%, NaCl 600 mM, tampón fosfato 10 mM, y o bien el 10, el 15, el 20 o bien el 25% de uno de los siguientes disolventes apróticos polares: sulfolano 20 γ-butirolactona tritiocarbonato de etileno
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