Normalized & Subtracted Library Services
Help Finding Rare Sequences
If you suspect that your target is rare and likely to be poorly expressed compared with more abundant messages, consider using our normalization and subtraction services. Proprietary, self-subtraction, or tissue-tissue subtraction techniques reduce abundant sequences 10- to 100-fold (Figure 1 and Table 1), making it easier to find rare or low-expressed targets. The resulting normalized library enhances discovery of novel sequences and needs less sequencing—especially important for high-throughput applications. Our normalized/subtracted libraries achieve:
- No significant loss of average insert size
- Low vector background
- >3 x 106 clones
Figure 1. Reduction of abundant clones in normalized compared with non-normalized libraries.
Table 1. Reduction of abundant clones and preservation of insert sizes.
| cDNA library | Before normalization | After normalization | Probe used for QC | Fold reduction after normalization | ||
|---|---|---|---|---|---|---|
| Average insert size (kb) | % recombination | Average insert size (kb) | % recombination | |||
| Mouse Testis | 1.7 | 100 | 1.57 | 92 | EF-1a | 62 |
| Bovine Pooled | 1.7 | 96 | 1.72 | 96 | EF-1a | 16 |
| Dog Lymphocyte | 2.4 | 100 | 1.75 | 100 | ß -actin | 48 |
| Zebrafish | 2.0 | 100 | 1.97 | 96 | EF-1a | 352 |
| Salmon pooled | 1.9 | 96 | 1.66 | 96 | EF-1a | 46 |
| Cotton Aphid | 1.8 | 100 | 1.71 | 96 | ß -actin | 20 |
| Crab Gill | 1.1 | 100 | 1.26 | 100 | Arginine kinase | 30 |
| Castor Bean | 1.5 | 96 | 1.28 | 96 | 670-12S | 138 |
For more information or to order a service, call 800.955.6288x2 or e-mail custom.services@lifetech.com.
