Ataxia telangiectasia Syndrome via ATM Gene Sequencing with CNV Detection
- Summary and Pricing
- Clinical Features and Genetics
Sequencing and CNV
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This test is also offered via our exome backbone with CNV detection (click here). The exome-based test may be higher priced, but permits reflex to the entire exome or to any other set of clinically relevant genes.
For ordering sequencing of targeted known variants, please proceed to our Targeted Variants landing page.
The great majority of tests are completed within 20 days.
Approximately 90% of individuals with Ataxia-telangiectasia have detectable mutations via sequencing of the ATM gene (Gatti. GeneReviews. 2010).
Approximately 1-2% of patients have large genomic deletions involving the ATM gene that can be detected (Gatti. GeneReviews. 2010).
Ataxia telangiectasia (A-T) is characterized by early onset (1-4 years) progressive cerebellar ataxia, telangiectasias of the conjunctivae, oculomotor apraxia, choreoathetosis, immunodeficiency, slurred speech, frequent infections, and an increased risk of cancers, especially leukemia and lymphoma. Other solid tumors do occur. Cancer risk is increased by 60-180 fold over population risk (Thoms et al. Experimental Dermatology 16:532–544, 2007). Other features can include premature aging (e.g. grey hair) and insulin-resistant diabetes mellitus. Individuals with A-T are usually sensitive to ionizing radiation (e.g. radiotherapy). Non-classic forms can occur with adult-onset A-T and A-T with early-onset dystonia. Unlike A-T, which is caused by homozygous or compound heterozygous mutations in the ATM gene, heterozygous carriers of an ATM causative mutation are at an increased risk of breast cancer (Concannon et al. Cancer Res 68:6486–91, 2008) and heart disease (Swift et al. N Engl J Med 325:1831–1836, 1991). The time of onset and progression is variable between and within families of affected individuals. The prevalence of A-T has been reported to be 1:40,000-100,000 in the United States (Gatti. GeneReviews. 2010).
Ataxia-telangiectasia is an autosomal recessive disorder that is caused by mutations in the ATM gene. ATM encodes a serine protein kinase (ATM) that is involved in DNA repair via phosphorylation of downstream proteins. It senses double-stranded DNA breaks, coordinates cell-cycle checkpoints prior to repair, and recruits repair proteins to damaged DNA sites (Taylor et al. DNA Repair 3(8-9):1219-1225, 2004). Mutations in ATM result in defective checkpoint cycling. Over 500 private causative mutations are described with no common hot spots for mutations. In North America most affected individuals are compound heterozygotes for two ATM mutations. However, founder ATM mutations have been observed in several populations (Gatti. GeneReviews. 2010).
For this Next Generation Sequencing (NGS) test, sequencing is accomplished by capturing specific regions with an optimized solution-based hybridization kit, followed by massively parallel sequencing of the captured DNA fragments. Additional Sanger sequencing is performed for regions not captured or with insufficient number of sequence reads.
For Sanger sequencing, polymerase chain reaction (PCR) is used to amplify targeted regions. After purification of the PCR products, cycle sequencing is carried out using the ABI Big Dye Terminator v.3.0 kit. PCR products are resolved by electrophoresis on an ABI 3730xl capillary sequencer. In nearly all cases, cycle sequencing is performed separately in both the forward and reverse directions.
Copy number variants (CNVs) are also detected from NGS data. We utilize a CNV calling algorithm that compares mean read depth and distribution for each target in the test sample against multiple matched controls. Neighboring target read depth and distribution and zygosity of any variants within each target region are used to reinforce CNV calls. All CNVs are confirmed using another technology such as aCGH, MLPA, or PCR before they are reported.
This test provides full coverage of all coding exons of the ATM gene, plus ~10 bases of flanking noncoding DNA. We define full coverage as >20X NGS reads or Sanger sequencing.
Indications for Test
Individuals who are suspected of Ataxia-telangiectasia. Individuals with a family history of A-T and who want to know their carrier status of ATM mutations, especially since female relatives of individuals with ataxia-telangiectasia and who are carriers of an ATM mutation have a 2-5 fold increased risk of breast cancer (Swift et al. New Eng J Med 316: 1289-1294, 1987; Thompson et al. J Nat Cancer Inst 97: 813-822, 2005).This test is specifically designed for heritable germline mutations and is not appropriate for the detection of somatic mutations in tumor tissue.
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|Familial Cancer Of Breast||AD||114480|
- Genetic Counselor Team - email@example.com
- Jerry Machado, PhD, DABMG, FCCMG - firstname.lastname@example.org
- Concannon P, Haile RW, Borresen-Dale A-L, Rosenstein BS, Gatti RA, Teraoka SN, Diep AT, Jansen L, Atencio DP, Langholz B, Capanu M, Liang X, et al. 2008. Variants in the ATM Gene Associated with a Reduced Risk of Contralateral Breast Cancer. Cancer Research 68: 6486–6491. PubMed ID: 18701470
- Gatti R. 2010. Ataxia-Telangiectasia. In: Pagon RA, Adam MP, Bird TD, Dolan CR, Fong C-T, and Stephens K, editors. GeneReviews™, Seattle (WA): University of Washington, Seattle. PubMed ID: 20301790
- Swift M, Morrell D, Massey RB, Chase CL. 1991. Incidence of cancer in 161 families affected by ataxia-telangiectasia. N. Engl. J. Med. 325: 1831–1836. PubMed ID: 1961222
- Swift M, Reitnauer PJ, Morrell D, Chase CL. 1987. Breast and other cancers in families with ataxia-telangiectasia. N. Engl. J. Med. 316: 1289-1294. PubMed ID: 3574400
- Taylor et al. (2004). "Ataxia-telangiectasia-like disorder (ATLD)—its clinical presentation and molecular basis." DNA Repair 3(8-9):1219-25. PubMed ID: 15279810
- Thompson et al. (2005) "Cancer risks and mortality in heterozygous ATM mutation carriers." J Nat. Cancer Inst 97: 813-822. PubMed ID: 15928302
- Thoms et al. (2007). "Lessons learned from DNA repair defective syndromes." Experimental Dermatology 16:532–544. PubMed ID: 17518994
Sequencing and CNV Detection via NextGen Sequencing using PG-Select Capture Probes
We use a combination of Next Generation Sequencing (NGS) and Sanger sequencing technologies to cover the full coding regions of the listed genes plus ~10 bases of non-coding DNA flanking each exon. As required, genomic DNA is extracted from the patient specimen. For NGS, patient DNA corresponding to these regions is captured using an optimized set of DNA hybridization probes. Captured DNA is sequenced using Illumina’s Reversible Dye Terminator (RDT) platform (Illumina, San Diego, CA, USA). Regions with insufficient coverage by NGS are covered by Sanger sequencing.
For Sanger sequencing, Polymerase Chain Reaction (PCR) is used to amplify targeted regions. After purification of the PCR products, cycle sequencing is carried out using the ABI Big Dye Terminator v.3.0 kit. PCR products are resolved by electrophoresis on an ABI 3730xl capillary sequencer. In nearly all cases, cycle sequencing is performed separately in both the forward and reverse directions.
Patient DNA sequence is aligned to the genomic reference sequence for the indicated gene region(s). All differences from the reference sequences (sequence variants) are assigned to one of five interpretation categories, listed below, per ACMG Guidelines (Richards et al. 2015).
(1) Pathogenic Variants
(2) Likely Pathogenic Variants
(3) Variants of Uncertain Significance
(4) Likely Benign Variants
(5) Benign Variants
Human Genome Variation Society (HGVS) recommendations are used to describe sequence variants (http://www.hgvs.org). Rare variants and undocumented variants are nearly always classified as likely benign if there is no indication that they alter protein sequence or disrupt splicing.
Deletion and Duplication Testing via NGS
As of March 2016, 6.36 Mb of sequence (83 genes, 1557 exons) generated in our lab was compared between Sanger and NextGen methodologies. We detected no differences between the two methods. The comparison involved 6400 total sequence variants (differences from the reference sequences). Of these, 6144 were nucleotide substitutions and 256 were insertions or deletions. About 65% of the variants were heterozygous and 35% homozygous. The insertions and deletions ranged in length from 1 to over 100 nucleotides.
In silico validation of insertions and deletions in 20 replicates of 5 genes was also performed. The validation included insertions and deletions of lengths between 1 and 100 nucleotides. Insertions tested in silico: 2200 between 1 and 5 nucleotides, 625 between 6 and 10 nucleotides, 29 between 11 and 20 nucleotides, 25 between 21 and 49 nucleotides, and 23 at or greater than 50 nucleotides, with the largest at 98 nucleotides. All insertions were detected. Deletions tested in silico: 1813 between 1 and 5 nucleotides, 97 between 6 and 10 nucleotides, 32 between 11 and 20 nucleotides, 20 between 21 and 49 nucleotides, and 39 at or greater than 50 nucleotides, with the largest at 96 nucleotides. All deletions less than 50 nucleotides in length were detected, 13 greater than 50 nucleotides in length were missed. Our standard NextGen sequence variant calling algorithms are generally not capable of detecting insertions (duplications) or heterozygous deletions greater than 100 nucleotides. Large homozygous deletions appear to be detectable.
Interpretation of the test results is limited by the information that is currently available. Better interpretation should be possible in the future as more data and knowledge about human genetics and this specific disorder are accumulated.
When Sanger sequencing does not reveal any difference from the reference sequence, or when a sequence variant is homozygous, we cannot be certain that we were able to detect both patient alleles. Occasionally, a patient may carry an allele which does not amplify, due to a large deletion or insertion. In these cases, the report will contain no information about the second allele. Our Sanger and NGS Sequencing tests are generally not capable of detecting Copy Number Variants (CNVs).
We sequence all coding exons for each given transcript, plus ~10 bp of flanking non-coding DNA for each exon. Test reports contain no information about other portions of the gene, such as regulatory domains, deep intronic regions or any currently uncharacterized alternative exons.
In most cases, we are unable to determine the phase of sequence variants. In particular, when we find two likely causative mutations for recessive disorders, we cannot be certain that the mutations are on different alleles.
Our ability to detect minor sequence variants due to somatic mosaicism is limited. Sequence variants that are present in less than 50% of the patient’s nucleated cells may not be detected.
Runs of mononucleotide repeats (eg (A)n or (T)n) with n >8 in the reference sequence are generally not analyzed because of strand slippage during PCR.
Unless otherwise indicated, DNA sequence data is obtained from a specific cell-type (usually leukocytes from whole blood). Test reports contain no information about the DNA sequence in other cell-types.
We cannot be certain that the reference sequences are correct.
Rare, low probability interpretations of sequencing results, such as for example the occurrence of de novo mutations in recessive disorders, are generally not included in the reports.
We have confidence in our ability to track a specimen once it has been received by PreventionGenetics. However, we take no responsibility for any specimen labeling errors that occur before the sample arrives at PreventionGenetics.
myPrevent - Online Ordering
- The test can be added to your online orders in the Summary and Pricing section.
- Once the test has been added log in to myPrevent to fill out an online requisition form.
- A completed requisition form must accompany all specimens.
- Billing information along with specimen and shipping instructions are within the requisition form.
- All testing must be ordered by a qualified healthcare provider.
(Delivery accepted Monday - Saturday)
- Collect 3 ml -5 ml (5 ml preferred) of whole blood in EDTA (purple top tube) or ACD (yellow top tube). For Test #500-DNA Banking only, collect 10 ml -20 ml of whole blood.
- For small babies, we require a minimum of 1 ml of blood.
- Only one blood tube is required for multiple tests.
- Ship blood tubes at room temperature in an insulated container. Do not freeze blood.
- During hot weather, include a frozen ice pack in the shipping container. Place a paper towel or other thin material between the ice pack and the blood tube.
- In cold weather, include an unfrozen ice pack in the shipping container as insulation.
- At room temperature, blood specimen is stable for up to 48 hours.
- If refrigerated, blood specimen is stable for up to one week.
- Label the tube with the patient name, date of birth and/or ID number.
(Delivery accepted Monday - Saturday)
- Send in screw cap tube at least 5 µg -10 µg of purified DNA at a concentration of at least 20 µg/ml for NGS and Sanger tests and at least 5 µg of purified DNA at a concentration of at least 100 µg/ml for gene-centric aCGH, MLPA, and CMA tests, minimum 2 µg for limited specimens.
- For requests requiring more than one test, send an additional 5 µg DNA per test ordered when possible.
- DNA may be shipped at room temperature.
- Label the tube with the composition of the solute, DNA concentration as well as the patient’s name, date of birth, and/or ID number.
- We only accept genomic DNA for testing. We do NOT accept products of whole genome amplification reactions or other amplification reactions.
(Delivery preferred Monday - Thursday)
- PreventionGenetics should be notified in advance of arrival of a cell culture.
- Culture and send at least two T25 flasks of confluent cells.
- Some panels may require additional flasks (dependent on size of genes, amount of Sanger sequencing required, etc.). Multiple test requests may also require additional flasks. Please contact us for details.
- Send specimens in insulated, shatterproof container overnight.
- Cell cultures may be shipped at room temperature or refrigerated.
- Label the flasks with the patient name, date of birth, and/or ID number.
- We strongly recommend maintaining a local back-up culture. We do not culture cells.