The SALSA MLPA Probemix P245 Microdeletion Syndromes-1A is an in vitro diagnostic (IVD)1
or research use only (RUO) semi-quantitative assay2
for the detection of a distinct subset of recurrent microdeletions and microduplications (mentioned in the table below) in genomic DNA isolated from human peripheral whole blood, buccal swabs, (un)cultured amniotic fluid obtained in week 16 of the pregnancy or later and free from blood contamination, (un)cultured chorionic villi free from maternal contamination, or foetal blood specimens. P245 Microdeletion Syndromes-1A is intended to confirm a potential cause for and clinical diagnosis of developmental delay and/or intellectual disability syndromes.
This probemix has a limited number of probes for each specific chromosomal region and will therefore not detect all possible causes of the syndromes included. Copy number variations (CNVs) detected with the P245 Microdeletion Syndromes-1A probemix must be confirmed by a designated MLPA follow-up probemix or another technique.
Assay results are intended to be used in conjunction with other clinical and diagnostic findings, consistent with professional standards of practice, including confirmation by alternative methods, parental evaluation, clinical genetic evaluation, and counselling, as appropriate. The results of this test should be interpreted by a clinical molecular geneticist or equivalent.
This device is not intended to be used for standalone diagnostic purposes, pre-implantation testing, population screening, or for the detection of, or screening for, acquired or somatic genetic aberrations.
Please note that this probemix is for in vitro diagnostic (IVD) use in the countries specified at the end of this product description. In all other countries, the product is for research use only (RUO).
To be used in combination with a SALSA MLPA Reagent Kit and Coffalyser.Net analysis software.
|1p36 deletion syndrome
|2p16.1-p15 microdeletion syndrome
|2q23.1 microdeletion/microduplication syndrome
|3q29 microdeletion syndrome
|3q29 microduplication syndrome
|Williams-Beuren duplication syndrome
|9q22.3 microdeletion syndrome
|Witteveen-Kolk*/15q24 microdeletion syndrome
|NF1 microdeletion syndrome
|Koolen-de Vries syndrome
|17q21.31 microduplication syndrome
|22q11.2 microduplication syndrome
|Distal 22q11.2 deletion syndrome
|MECP2 duplication syndrome
*Please note that the SIN3A gene, which has been described as the critical gene in Witteveen-Kolk syndrome, is not covered by the probes in this P245 probemix.
Microdeletion and microduplication syndromes are defined as a group of clinically recognisable disorders characterised by a small (< 5 Mb) deletion or duplication of a chromosomal segment spanning multiple disease genes. The phenotype is the result of haploinsufficiency or overexpression of specific genes in the critical interval. Clinically well described syndromes, for which the involvement of multiple disease genes has been established or is strongly suspected, include DiGeorge syndrome (22q11 microdeletion), Williams-Beuren syndrome (7q11 microdeletion), Neurofibromatosis type 1 (17q11 microdeletion), Smith-Magenis Syndrome (17p microdeletion) and many more. Most patients with microdeletion/microduplication syndromes present with intellectual disability (ID), developmental delay (DD), congenital abnormalities and/or dysmorphic features.
Intellectual disability and developmental delay affects 1-3% of the population and results from extraordinary heterogeneous environmental, chromosomal and monogenic causes. Detailed analysis of the Online Mendelian Inheritance in Man database and literature searches revealed more than a thousand entries for ID and DD, and more than 290 genes involved in clinical phenotypes or syndromes, metabolic or neurological disorders characterised by ID/DD.
The genetic changes of microdeletions/duplications are often not detectable by the current band resolution using routine or high resolution karyotyping (2-5 Mb) but require the application of molecular cytogenetic techniques such as Fluorescence In Situ Hybridisation (FISH), MLPA or array Comparative Genomic Hybridisation (aCGH).
The SALSA MLPA Probemix P245-B1 Microdeletion Syndromes-1A contains 50 MLPA probes with amplification products between 130 and 499 nucleotides (nt). The probes detect sequences involved in a distinct subset of microdeletion and microduplication disorders (described above). Complete probe sequences are available online (www.mrcholland.com
This probemix contains nine quality control fragments generating amplification products between 64 and 105 nt: four DNA Quantity fragments (Q-fragments), two DNA Denaturation fragments (D-fragments), one Benchmark fragment, and one chromosome X and one chromosome Y-specific fragment. More information on how to interpret observations on these control fragments can be found in the MLPA General Protocol and online at www.mrcholland.com