U.S. Dept Commerce/NOAA/NMFS/NWFSC/Publications

NOAA-NWFSC Tech Memo-14: 32P-Postlabeling Protocols for Assaying Levels of Hydrophobic DNA Adducts in Fish

Table 1. Typical Excel worksheet showing Phosphoimager data and calculation of DNA damage

PPL# Sample # Study Site Species PI vol-a CF-a cpm-a SA-a AQ-a PI vol-b CF-b CPM-b SA-b AQ-b dG-CF dil-b nmol-b fmol-a nmol/mol-b
              ** F2/G2         K2/L2         (M2*O2*P2*Q2)
/N2
(H2*J2)
/I2
S2/
(R2*0.001)
148-01 90.3180 R&F '90 Pristine Sound P. Mudgrunt 951268 8060 118 1939 2 4024071 126 31836 968055 2.4 4.76 100 38 0.12 3
148-02 90.3181 R&F '90 Pristine Sound P. Mudgrunt 718964 8060 89 1939 2 4761861 126 37673 968055 2.4 4.76 100 44 0.09 2
148-03 90.3182 R&F '90 Pristine Sound P. Mudgrunt 499168 8060 62 1939 2 2406825 126 19041 968055 2.4 4.76 100 22 0.06 3
148-04 90.3183 R&F '90 Pristine Sound P. Mudgrunt 1133085 8060 141 1939 2 2993307 126 23681 968055 2.4 4.76 100 28 0.15 5
148-05 90.3184 R&F '90 Pristine Sound P. Mudgrunt 572750 8060 71 1939 2 2721056 126 21527 968055 2.4 4.76 100 25 0.07 3
148-06 90.3185 R&F '90 Pristine Sound P. Mudgrunt 581683 8060 72 1939 2 1472010 126 11646 968055 2.4 4.76 100 14 0.07 5
148-07 90.3186 R&F '90 Pristine Sound P. Mudgrunt 1003146 8060 124 1939 2 2168595 126 17157 968055 2.4 4.76 100 20 0.13 6
148-08 90.3187 R&F '90 Pristine Sound P. Mudgrunt 1562322 8060 194 1939 2 4421854 126 34983 968055 2.4 4.76 100 41 0.20 5
148-09 91.9980 R&F '91 Urban Bay P. Mudgrunt 10035754 8060 1245 1939 2 2093496 126 16562 968055 2.4 4.76 100 20 1.28 66
148-10 91.9981 R&F '91 Urban Bay P. Mudgrunt 32846867 8060 4075 1939 2 3719354 126 29425 968055 2.4 4.76 100 35 4.20 121
148-11 91.9982 R&F '91 Urban Bay P. Mudgrunt 29776508 8060 3694 1939 2 3929672 126 31089 968055 2.4 4.76 100 37 3.81 104
148-12 91.9983 R&F '91 Urban Bay P. Mudgrunt 33118195 8060 4109 1939 2 2539131 126 20088 968055 2.4 4.76 100 24 4.24 179
148-13 91.9984 R&F '91 Urban Bay P. Mudgrunt 45305225 8060 5621 1939 2 3358298 126 26569 968055 2.4 4.76 100 31 5.80 185
148-14 91.9985 R&F '91 Urban Bay P. Mudgrunt 97089089 8060 12046 1939 2 4359981 126 34494 968055 2.4 4.76 100 41 12.42 305
148-15 91.9986 R&F '91 Urban Bay Sp. Mudgrunt 4077333 8060 506 1939 2 3052623 126 24150 968055 2.4 4.76 100 28 0.52 18
148-16 91.9987 R&F '91 Urban Bay Sp. Mudgrunt 336385 8060 42 1939 2 1089497 126 8619 968055 2.4 4.76 100 10 0.04 4
148-17 91.9988 R&F '91 Urban Bay Sp. Mudgrunt 2638708 6852 385 1939 2 3208020 126 25380 968055 2.4 4.76 100 30 0.40 13
148-18 91.9989 R&F '91 Urban Bay Sp. Mudgrunt 1494894 6852 218 1939 2 2414327 126 19101 968055 2.4 4.76 100 23 0.22 10
148-19 91.9990 R&F '91 Urban Bay Sp. Mudgrunt 734904 6852 107 1939 2 2715641 126 21485 968055 2.4 4.76 100 25 0.11 4
148-20 91.9991 R&F '91 Urban Bay Sp. Mudgrunt 1733913 6852 253 1939 2 3768276 126 29812 968055 2.4 4.76 100 35 0.26 7
148-21 91.9992 R&F '91 Urban Bay Sp. Mudgrunt 2072451 6852 302 1939 2 2628056 126 20792 968055 2.4 4.76 100 25 0.31 13
BP         34783296 8314 4184 1939 1.333                 2.88  

"a" refers to DNA adduct related data and "b" refers to DNA bases related data.
CF-b = factor to convert dG image volume to cpm.
** = arithmetic operation to obtain this cell value based on information in previous cells in this row.
>AQ-b = aliquot factor (volume of solution labeled/volume spotted on PEI-cellulose sheet).
PI vol-a = Integrated volume units for the computer generated image from the storage phosphor imaging system.
dG-CF = 4.76 = total DNA%/dG% = 100%/21%
CF-a = factor used to convert PI volume units to cpm.
dil-b = dilution factor for bases (5 µL enzyme hydrolysate diluted to 500 µL with H2O).
cpm-a = cpm of the adducts measured on the chromatogram.
nmol-b = nmol of bases used in the assay.
SA-a= specific activity of [gamma-32P]ATP used for labeling adducts.
fmol-a = fmol of DNA adducts labeled.
AQ-a = aliquot factor (volume of DNA-adduct labeling solution/volume spotted on PEI-cellulose sheet).
nmol-a/mol-b = fmol of adducts/(nmol of bases*0.001); nmol of bases*0.001 = µmol of bases
PI-b vol = Integrated volume of the DNA bases (dG spot) image from the storage phosphor imaging system.

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