Submissions for variant NM_000051.4(ATM):c.3284+1G>C

dbSNP: rs864622129

Total submissions: 3

Submitter	RCV	SCV	Clinical significance	Condition	Last evaluated	Review status	Method	Comment
Labcorp Genetics (formerly Invitae), Labcorp	RCV000459518	SCV000546811	likely pathogenic	Ataxia-telangiectasia syndrome	2023-08-16	criteria provided, single submitter	clinical testing	This sequence change affects a donor splice site in intron 22 of the ATM gene. RNA analysis indicates that disruption of this splice site induces altered splicing and may result in an absent or disrupted protein product. This variant is not present in population databases (gnomAD no frequency). Disruption of this splice site has been observed in individual(s) with ataxia-telangiectasia, colorectal cancer, and/or melanoma (PMID: 21665257, 32658311, 34262154). ClinVar contains an entry for this variant (Variation ID: 407539). Studies have shown that disruption of this splice site results in skipping of exon 22 and introduces a premature termination codon (Invitae). The resulting mRNA is expected to undergo nonsense-mediated decay. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic.
Ambry Genetics	RCV002323709	SCV002607007	likely pathogenic	Hereditary cancer-predisposing syndrome	2021-09-02	criteria provided, single submitter	clinical testing	The c.3284+1G>C intronic variant results from a G to C substitution one nucleotide after coding exon 21 of the ATM gene. This nucleotide position is highly conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will weaken the native splice donor site. RNA studies have demonstrated that this alteration results in abnormal splicing in the set of samples tested (Ambry internal data). Alterations that disrupt the canonical splice site are expected to cause aberrant splicing, resulting in an abnormal protein or a transcript that is subject to nonsense-mediated mRNA decay. As such, this alteration is classified as likely pathogenic.
Myriad Genetics, Inc.	RCV004022645	SCV004933958	likely pathogenic	Familial cancer of breast	2024-01-19	criteria provided, single submitter	clinical testing	This variant is considered likely pathogenic. This variant occurs within a consensus splice junction and is predicted to result in abnormal mRNA splicing of either an out-of-frame exon or an in-frame exon necessary for protein stability and/or normal function.