MLPA and MAPH: Sensitive Detection of Deletions and Duplications

Johan T. den Dunnen1, Stefan J. White1

1 Human and Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands
Publication Name:  Current Protocols in Human Genetics
Unit Number:  Unit 7.14
DOI:  10.1002/0471142905.hg0714s51
Online Posting Date:  November, 2006
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The detection of quantitative changes in genomic DNA, i.e., deletions and duplications or so called Copy Number Variants (CNV), is an important element of a complete mutation screening strategy. However, because of practical difficulties, screening for quantitative changes in genomic DNA is often ignored. Hitherto, the techniques available were technically challenging and laborious and thus too costly to be applied on a routine basis. The development of MAPH (Multiplex Amplifiable Probe Hybridization) and more recently MLPA (Multiplex Ligation‚Äźdependent Probe Amplification) have revived interest in the detection of deletions and duplications, primarily due to the simplicity and flexibility of these two approaches. Compared to previous technologies, e.g., Southern blotting, fluorescence in situ hybridization (FISH), quantitative PCR (qPCR), and breakpoint PCR, they have some clear advantages, including high resolution, high throughput, amenability to multiplexing, and simplicity.

Keywords: deletion; duplication; copy number variation (CNV); diagnosis; genetic disease; chromosomal rearrangement

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Table of Contents

  • Basic Protocol 1: Multiplex Amplifiable Probe Hybridization (MAPH)
  • Basic Protocol 2: Multiplex Ligation‐Dependent Probe Amplification (MLPA)
  • Reagents and Solutions
  • Commentary
  • Literature Cited
  • Figures
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Basic Protocol 1: Multiplex Amplifiable Probe Hybridization (MAPH)

  • 0.25 to 1.0 µg/µl genomic DNA sample and positive and negative controls for duplication/deletion of interest
  • 1 M NaOH
  • Prehybridization solution (see recipe)
  • 1.0 mg/ml human Cot‐1 DNA
  • Probe mix: 100 to 500 pg/µl of each probe, in H 2O
  • 10 mg/ml herring sperm DNA
  • Blocker mix—20 µM each of the following primers:
  • 1.0 M NaH 2PO 4
  • Wash solution A: 1× SSC ( appendix 2D), prewarmed to 60°C
  • Wash solution B: 0.1× SSC ( appendix 2D)/0.1% (w/v) SDS, prewarmed to 60°C
  • 10× PCR buffer II (Applied Biosystems)
  • 25 mM MgCl 2
  • 10 mM dNTP mix: 10 mM each of dATP, dCTP, dGTP, and dTTP
  • 5 U/µl Taq DNA polymerase
  • PCR primers (one but not both should be fluorescently labeled for the second‐round PCR):
  • Formamide (Applied Biosystems)
  • Size standard for capillary electrophoresis (Applied Biosystems)
  • Nylon membrane (Hybond‐N+; Amersham)
  • 60°C water bath
  • Beaker with boiling water
  • 50‐ml conical polypropylene centrifuge tubes
  • Petri dish
  • 200‐µl PCR tubes, thin walled
  • Thermal cycler
  • 96‐well plates appropriate for capillary sequencer
  • 95°C heating block
  • Capillary sequencer (e.g., ABI3700 from Applied Biosystems)
  • Additional reagents and equipment for capillary electrophoresis (unit 7.12)

Basic Protocol 2: Multiplex Ligation‐Dependent Probe Amplification (MLPA)

  • 5 to 100 µg/ml genomic DNA in TE buffer, pH 7.6 (see recipe for buffer)
  • MLPA reagents (MRC‐Holland;; to prevent problems it is essential to carefully mix the viscous 50% glycerol enzyme stocks with the dilution buffers according to the manufacturer's instructions):
    • SALSA probe mix (black‐cap tube)
    • MLPA buffer (yellow‐cap tube)
    • Ligase‐65 buffer A (transparent‐cap tube)
    • Ligase‐65 buffer B (white‐cap tube)
    • Ligase (brown‐cap tube)
    • 10× SALSA PCR buffer (red‐cap tube)
    • SALSA PCR primers (purple‐cap tube):
      • forward primer (labeled): 5′‐GGGTTCCCTAAGGGTTGGA‐3′
      • reverse primer (unlabeled): 5′‐GTGCCAGCAAGATCCAATCTAGA‐3′
    • SALSA enzyme dilution buffer (blue‐cap tube)
    • SALSA DNA polymerase (orange‐cap tube)
  • Formamide (Applied Biosystems)
  • Size standard for capillary electrophoresis (Applied Biosystems)
  • 200‐µl PCR tubes, thin‐walled
  • Thermal cycler
  • 96‐well plates appropriate for capillary sequencer
  • 95°C heating block
  • Capillary sequencer (the authors have used the ABI3700 and ABI3730 from Applied Biosystems)
  • Additional reagents and equipment for capillary electrophoresis (unit 7.12)
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Literature Cited

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