Kabuki Syndrome Panel
Test code: MA0901
The Blueprint Genetics Kabuki Syndrome Panel is a seven gene test for genetic diagnostics of patients with clinical suspicion of Kabuki syndrome.
KMT2D-related Kabuki syndrome (KS) is inherited in an autosomal dominant manner. Clinical diagnostic criteria for KS have not been fully established and molecular analysis may confirm the clinical diagnosis or help in differential diagnosis. This panel is part of Comprehensive Skeletal / Malformation Syndrome Panel.
About Kabuki Syndrome
Kabuki syndrome (KS) is a multiple congenital anomaly syndrome characterized by typical facial features, skeletal anomalies, mild to moderate intellectual disability and postnatal growth deficiency. Typical facial features include elongated palpebral fissures with eversion of the lateral third of the lower eyelid, arched and broad eyebrows with the lateral third displaying sparseness or notching, short columella with depressed nasal tip and large, prominent or cupped ears. Other findings may include: congenital heart defects, genitourinary anomalies, cleft lip and/or palate, gastrointestinal anomalies including anal atresia, ptosis and strabismus, and widely spaced teeth and hypodontia. Musculo-skeletal anomalies include brachydactyly V, brachymesophalangy, clinodactyly of fifth digits, spine abnormalities and joint hypermobility and dislocations. Dermatoglyphic abnormalities with persistence of fetal fingertip pads are a cardinal sign of KS. Functional differences may include increased susceptibility to infections and autoimmune disorders, seizures, endocrinologic abnormalities including isolated premature thelarche in females, feeding problems, and hearing loss. KS was initially described in Japan, but has now been observed in all ethnic groups, with prevalence estimation 1/32,000. Clinical diagnostic criteria for KS have not been established. Diagnosis relies on the clinical observation of 5 cardinal findings which are 1) cranio-facial features, 2) postnatal growth retardation, 3) skeletal anomalies, 4) persistence of fetal fingertips and 5) intellectual deficiency. Molecular analysis may confirm the clinical diagnosis. Differential diagnosis of KS includes CHARGE (mutations in CHD7), branchiootorenal (EYA1 and SIX5), Ehlers-Danlos (hypermobile form) or Larsen syndrome (FLNB-related disorders), Hardikar syndromes and IRF6-related disorders. Various chromosomal anomalies can also induce clinical signs that overlap the KS clinical spectrum.
KS is associated in 45-80% of cases with mutations in the KMT2D (formerly MLL2 gene). KMT2D-related KS is inherited in an autosomal dominant manner. Each child of an individual with KMT2D-related KS has a 50% chance of inheriting the mutation. To date only six individuals with mutations or deletions of KDM6A have been reported; all have had a proven or apparent de novo mutation. While X-linked inheritance is theoretically possible, no familial cases of KS resulting from mutations in KDM6A have been reported. The proportion of KS caused by de novo mutations is unknown, but is likely high based on clinical experience.
Results in 3-4 weeks. We do not offer a maternal cell contamination (MCC) test at the moment. We offer prenatal testing only for cases where the maternal cell contamination studies (MCC) are done by a local genetic laboratory. Read more.
|CHD7||Isolated gonadotropin-releasing hormone deficiency, CHARGE syndrome||AD||128||746|
|EYA1||Otofaciocervical syndrome, Branchiootic syndrome, Branchiootorenal syndrome||AD||33||186|
|FLNB||Larsen syndrome (dominant), Atelosteogenesis type 1, Atelosteogenesis type 3, Spondylo-carpal-tarsal dyspasia||AD/AR||38||98|
|IRF6||Orofacial cleft, Popliteal pterygium syndrome, van der Woude syndrome||AD||26||327|
Gene, refers to HGNC approved gene symbol; Inheritance to inheritance patterns such as autosomal dominant (AD), autosomal recessive (AR) and X-linked (XL); ClinVar, refers to a number of variants in the gene classified as pathogenic or likely pathogenic in ClinVar (http://www.ncbi.nlm.nih.gov/clinvar/); HGMD, refers to a number of variants with possible disease association in the gene listed in Human Gene Mutation Database (HGMD, http://www.hgmd.cf.ac.uk/ac/). The list of associated (gene specific) phenotypes are generated from CDG (http://research.nhgri.nih.gov/CGD/) or Orphanet (http://www.orpha.net/) databases.
Blueprint Genetics offers a comprehensive Kabuki Syndrome Panel that covers classical genes associated with Kabuki syndrome. The genes are carefully selected based on the existing scientific evidence, our experience and most current mutation databases. Candidate genes are excluded from this first-line diagnostic test. The test does not recognise balanced translocations or complex inversions, and it may not detect low-level mosaicism. The test should not be used for analysis of sequence repeats or for diagnosis of disorders caused by mutations in the mitochondrial DNA.
Analytical validation is a continuous process at Blueprint Genetics. Our mission is to improve the quality of the sequencing process and each modification is followed by our standardized validation process. Average sensitivity and specificity in Blueprint NGS Panels is 99.3% and 99.9% for detecting SNPs. Sensitivity to for indels vary depending on the size of the alteration: 1-10bps (96.0%), 11-20 bps (88.4%) and 21-30 bps (66.7%). The longest detected indel was 46 bps by sequence analysis. Detection limit for Del/Dup (CNV) analysis varies through the genome depending on exon size, sequencing coverage and sequence content. The sensitivity is 71.5% for single exon deletions and duplications and 99% for three exons’ deletions and duplications. We have validated the assays for different starting materials including EDTA-blood, isolated DNA (no FFPE) and saliva that all provide high-quality results. The diagnostic yield varies substantially depending on the used assay, referring healthcare professional, hospital and country. Blueprint Genetics’ Plus Analysis (Seq+Del/Dup) maximizes the chance to find molecular genetic diagnosis for your patient although Sequence Analysis or Del/Dup Analysis may be cost-effective first line test if your patient’s phenotype is suggestive for a specific mutation profile.
The sequencing data generated in our laboratory is analyzed with our proprietary data analysis and annotation pipeline, integrating state-of-the art algorithms and industry-standard software solutions. Incorporation of rigorous quality control steps throughout the workflow of the pipeline ensures the consistency, validity and accuracy of results. The highest relevance in the reported variants is achieved through elimination of false positive findings based on variability data for thousands of publicly available human reference sequences and validation against our in-house curated mutation database as well as the most current and relevant human mutation databases. Reference databases currently used are the 1000 Genomes Project (http://www.1000genomes.org), the NHLBI GO Exome Sequencing Project (ESP; http://evs.gs.washington.edu/EVS), the Exome Aggregation Consortium (ExAC; http://exac.broadinstitute.org), ClinVar database of genotype-phenotype associations (http://www.ncbi.nlm.nih.gov/clinvar) and the Human Gene Mutation Database (http://www.hgmd.cf.ac.uk). The consequence of variants in coding and splice regions are estimated using the following in silico variant prediction tools: SIFT (http://sift.jcvi.org), Polyphen (http://genetics.bwh.harvard.edu/pph2/), and Mutation Taster (http://www.mutationtaster.org).
Through our online ordering and statement reporting system, Nucleus, the customer can access specific details of the analysis of the patient. This includes coverage and quality specifications and other relevant information on the analysis. This represents our mission to build fully transparent diagnostics where the customer gains easy access to crucial details of the analysis process.
In addition to our cutting-edge patented sequencing technology and proprietary bioinformatics pipeline, we also provide the customers with the best-informed clinical report on the market. Clinical interpretation requires fundamental clinical and genetic understanding. At Blueprint Genetics our geneticists and clinicians, who together evaluate the results from the sequence analysis pipeline in the context of phenotype information provided in the requisition form, prepare the clinical statement. Our goal is to provide clinically meaningful statements that are understandable for all medical professionals, even without training in genetics.
Variants reported in the statement are always classified using the Blueprint Genetics Variant Classification Scheme modified from the ACMG guidelines (Richards et al. 2015), which has been developed by evaluating existing literature, databases and with thousands of clinical cases analyzed in our laboratory. Variant classification forms the corner stone of clinical interpretation and following patient management decisions. Our statement also includes allele frequencies in reference populations and in silico predictions. We also provide PubMed IDs to the articles or submission numbers to public databases that have been used in the interpretation of the detected variants. In our conclusion, we summarize all the existing information and provide our rationale for the classification of the variant.
A final component of the analysis is the Sanger confirmation of the variants classified as likely pathogenic or pathogenic. This does not only bring confidence to the results obtained by our NGS solution but establishes the mutation specific test for family members. Sanger sequencing is also used occasionally with other variants reported in the statement. In the case of variant of uncertain significance (VUS) we do not recommend risk stratification based on the genetic finding. Furthermore, in the case VUS we do not recommend use of genetic information in patient management or genetic counseling. For some cases Blueprint Genetics offers a special free of charge service to investigate the role of identified VUS.
We constantly follow genetic literature adapting new relevant information and findings to our diagnostics. Relevant novel discoveries can be rapidly translated and adopted into our diagnostics without delay. These processes ensure that our diagnostic panels and clinical statements remain the most up-to-date on the market.
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Choose an analysis method
ICD & CPT codes
Commonly used ICD-10 codes when ordering the Kabuki Syndrome Panel
Accepted sample types
- EDTA blood, min. 1 ml
- Purified DNA, min. 5μg
- Saliva (Oragene DNA OG-500 kit)
Label the sample tube with your patient’s name, date of birth and the date of sample collection.
Note that we do not accept DNA samples isolated from formalin-fixed paraffin-embedded (FFPE) tissue.