N-MYC/LAF4

Product Name

MYCN gene amplification probe reagent.

Package Specifications

10 Tests/box.

Product introduction

The kit uses orange fluorescein labeled N-MYC orange probe and green fluorescein labeled LAF4 green probe. N-MYC/LAF4 probe can be combined with the target detection site by in situ hybridization.

Product Main Components

The kit consists of N-MYC/LAF4 dual color probe as shown in Table 1.

Storage conditions & Validity

Keep sealed away from light at -20°C ± 5°C. The product is valid for 12 months. Avoid unnecessary repeated freezing and thawing that should not exceed 10 times. After opening, within 24 hours for short-term preservation, keep sealed at 2-8°C in dark. For long-term preservation after opening, keep the lid sealed at -20°C ± 5°C away from light. The kit is transported below 0°C.

Applicable Instruments

Fluorescence microscopic imaging system, including fluorescence microscope and filter set suitable for DAPI (367/452), green (495/517), and orange (547/565).

Sample Requirements

1. Applicable specimen type: paraffin embedded specimen of surgical resection or biopsy tissue.
2. The tissue in vitro should be fixed with 4% neutral formaldehyde fixative within 1 hour. After the tissue is fixed, it is often dehydrated and embedded in paraffin.

Instructions

1. Hybridization pretreatment
   Baking: Slides heating at 80°C for 30 min or 65°C for 2h or overnight.
   Dewaxing: According to the customer laboratory protocol (Commonly with Xylene for 15 min).
   Hydration: Take out the slides and put them respectively into 100%, 85%, and 70% EtOH at room temperature for 3 minutes each. Take out the slides, and immerse them in deionized water for 3 minutes. Remove the excess water on the slides by air-drying.
   Permeation: Immerse the slides in deionized water at 100°C and boil continuously for 20-40 minutes (Conventional 20 min). Remove the excess water on the slides by air-drying.
   Digestion: Protease enzymic digestion at 37°C for 10-40 minutes. Mix the protease work buffer (50mmol HCl) and the 10x protease solution (Pepsin concentration 5%) in a proportion of 9:1 to prepare the enzymatic digestion solution.
   Washing: Wash with 2xSSC at room temperature for 5 minutes.
   Dehydration: Take out the slides and dehydrate in 70%, 85%, and 100% gradient ethanol at room temperature for 2 minutes each time. Remove the excess of EtOH solution on the slides by air-drying.
2. Denaturing hybridization
   The following operations should be carried out in the darkroom.
   1. Take out the probe, let it stand at room temperature for 5 min, turn it upside down with force, mix the probe well, centrifuge it briefly (do not vibrate with vortex apparatus), drop 10μl into the hybridization area of the cell drop, cover the 22mm×22mm cover glass immediately, the probe should be evenly spread under the cover glass without bubbles, and seal the edge with rubber (the edge sealing must be thorough to prevent the dry slide from affecting the test results in the hybridization process).
   2. Place the glass slide in the hybridization instrument, denature at 85°C for 5 min (the hybridizer should be preheated to 85°C), and hybridized at 42°C for 2-16h.
3. Washing
   The following operations should be carried out in a darkroom.
   1. Carefully tear off the adhesive around the cover glass with tweezers to avoid sticking off or moving the cover glass. Immerse the cell drop into 2xSSC for about 5s, and take it out. Gently push one corner of the cover glass to the edge of the slide with tweezers, and gently remove the cover glass with tweezers.
   2. The cells were placed at 2xSSC room temperature for 1 min.
   3. Take out the slides and immerse in a preheated at 68°C 0.3% NP-40/0.4xSSC (Preparation of 0.3% NP-40/0.4xSSC: For 1L preparation, take 3mL NP-40 and 20mL 20xSSC, dissolve fully, mix well, and use 1M NaOH to adjust the pH to 7.2) solution and wash for 2 min.
   4. The slides were immersed in deionized water preheated at 37°C for 1 min, and then dried naturally in the dark.
4. Counterstaining
   The following operations should be performed in a darkroom.
   10μl DAPI compound dye is dropped in the hybridization area of the glass slide and immediately covered. The suitable filter is selected for glass slide observation under the fluorescence microscope.
5. FISH results observation
   Place the stained sections under a fluorescence microscope, and the cell area is first confirmed under a low magnification objective (10x); under magnification objective (40x), a uniform cell distribution is observed; then the nucleus size uniformity, nuclear boundary integrity, DAPI staining uniformity, no nuclei overlapping, and clear cell signals are observed under the high magnification objective (100x).

Interpretation of common signal types

Precautions

1. The results of this kit will be affected by various factors of the sample itself, but also limited by hybridization temperature and time, operating environment, and the limitations of current molecular biology technology, which may lead to wrong results.
2. Users must understand the potential errors and accuracy limitations that may exist in the detection process.
3. All chemicals are potentially dangerous. Avoid direct contact. Used kits are clinical waste and should be properly disposed of.

Manual Approval date & Revision date

V1. 0: Approval date: November 3, 2019.
V1. 4: Revision date: December 7, 2021.