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Determination of hybrid status in Lilium by Fluorescence in situ hybridisation (FISH) (CAT#: STEM-MB-1225-WXH)

Introduction

Wide hybridisation enables the introduction of desired genes, such as those encoding resistance to pathogens and adverse climatic conditions, to many plant crops and ornamentals. It is well known that not all plants obtained from wide crosses are hybrids. They may also arise apomictically from unfertilised maternal cells. This process may be induced by incompatible or sterile pollen. In the genus Lilium, the apomictic means of propagation was reported in Lilium regale, L. speciosum, L. canadense, L. szovitsianum, L. longiflorum, L. superbum and L. pumilum. Apomixis and the possibility of uncontrolled pollination make it necessary to confirm whether or not seedlings obtained from distant crosses are indeed desired hybrids.




Principle

FISH uses fluorescent probes with complementary base sequences to locate the presence or absence of specific portions of DNA on chromosomes. The probe and target DNA must be denatured with heat or chemicals to break hydrogen bonds in the DNA and to allow hybridisation to occur once the two samples are mixed. The fluorescent probes form new hydrogen bonds with their complementary base pairs on the DNA, and these can then be detected via microscopy.

Applications

Detect and localize the presence or absence of specific DNA sequences on chromosomes.
Detect and localize specific RNA targets (mRNA, lncRNA and miRNA) in cells, circulating tumor cells, and tissue samples.

Procedure

1. Sample preparation
2. Co-denaturation and hybridization
3. Probe detection
4. Wash off of unbound probe
5. Analysis by flow cytometer/fluorescence microscopy

Materials

• Flow cytometer
• Fluorescence microscopy
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