ClinVar Miner

Submissions for variant NM_000051.3(ATM):c.5675-4T>A (rs56075338)

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Total submissions: 8
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Invitae RCV001085879 SCV000252966 benign Ataxia-telangiectasia syndrome 2020-11-21 criteria provided, single submitter clinical testing
Ambry Genetics RCV000214255 SCV000274949 uncertain significance Hereditary cancer-predisposing syndrome 2020-09-04 criteria provided, single submitter clinical testing The c.5675-4T>A intronic variant results from a T to A substitution 4 nucleotides upstream from coding exon 37 in the ATM gene. This variant has been identified homozygous in a population-based cohort (Lek M et al. Nature 2016 08;536:285-91). This nucleotide position is well conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will not have any significant effect on splicing. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear.
GeneDx RCV000590713 SCV000569622 uncertain significance not provided 2018-07-06 criteria provided, single submitter clinical testing This variant is denoted ATM c.5675-4T>A or IVS37-4T>A and consists of a T>A nucleotide substitution at the -4 position of intron 37 of the ATM gene. In silico analyses, which include splice predictors and evolutionary conservation, are inconsistent in their assessment as to whether or not the variant is damaging.? This variant has not, to our knowledge, been published in the literature as a pathogenic or benign germline variant. This variant was observed at an allele frequency of 0.15% (47/30,736) in individuals of South Asian ancestry in large population cohorts (Lek 2016). Based on currently available evidence, it is unclear whether ATM c.5675-4T>A is a pathogenic or benign variant. We consider it to be a variant of uncertain significance.
Women's Health and Genetics/Laboratory Corporation of America, LabCorp RCV000590713 SCV000694306 likely benign not provided 2016-09-30 criteria provided, single submitter clinical testing Variant summary: The ATM c.5675-4T>A variant involves the alteration of a non-conserved intronic nucleotide with 4/5 splice prediction tools predicting no significant impact on normal splicing and ESE finder predicting the creation of an ESE binding site, however, these predictions have yet to be functionally assessed. The variant of interest has been observed in the large, broad control population, ExAC, with an allele frequency of 35/116558 (1/3330, 1 homozygote), predominantly in the South Asian cohort, 33/15866 (1/480), which exceeds the estimated maximal expected allele frequency for a pathogenic ATM variant of 1/999. Therefore, suggesting the variant is a common polymorphism found in population(s) of South Asian origin. The variant of interest, to our knowledge, has not been reported in affected individuals via publications, however, clinical diagnostic laboratories have cited the variant as "likely benign" or "uncertain significance." Therefore, the variant of interest has been classified as Likely Benign.
Color Health, Inc RCV000214255 SCV000910864 likely benign Hereditary cancer-predisposing syndrome 2015-06-09 criteria provided, single submitter clinical testing
Illumina Clinical Services Laboratory,Illumina RCV001085879 SCV001262763 uncertain significance Ataxia-telangiectasia syndrome 2018-01-13 criteria provided, single submitter clinical testing This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.
Natera, Inc. RCV001085879 SCV001452118 uncertain significance Ataxia-telangiectasia syndrome 2020-04-18 no assertion criteria provided clinical testing
Department of Pathology and Laboratory Medicine,Sinai Health System RCV001355672 SCV001550623 likely benign Malignant tumor of breast no assertion criteria provided clinical testing The ATM c.5675-4T>A variant was not identified in the literature nor was it identified in the GeneInsight-COGR, Cosmic, or LOVD 3.0 databases. The variant was identified in dbSNP (ID: rs56075338) as "With Uncertain significance allele" and ClinVar (classified as likely benign by Invitae; as uncertain significance by Ambry Genetics, GeneDx, and one other clinical laboratory). The variant was identified in control databases in 48 of 245526 chromosomes (1 homozygous) at a frequency of 0.0002 increasing the likelihood this could be a low frequency benign variant (Genome Aggregation Database Feb 27, 2017). The variant was observed in the following populations: European in 1 of 111308 chromosomes (freq: 0.000009) and South Asian in 47 of 30736 chromosomes (1 homozygous, freq: 0.0015), while the variant was not observed in the African, Other, Latino, Ashkenazi Jewish, East Asian, or Finnish populations. The c.5675-4T>A variant is located in the 3' splice region but does not affect the invariant -1 and -2 positions; positions -3 and -5 to -12 are part of the splicing consensus sequence and variants involving these positions sometimes affect splicing. In silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a difference in splicing. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time although we would lean towards a more benign role for this variant. This variant is classified as likely benign.

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