8-89978257-C-T
Variant summary
Our verdict is Likely benign. Variant got -1 ACMG points: 0P and 1B. BP4
The NM_002485.5(NBN):c.547G>A(p.Ala183Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000174 in 1,605,426 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A183E) has been classified as Uncertain significance.
Frequency
Consequence
NM_002485.5 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Likely_benign. Variant got -1 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
NBN | NM_002485.5 | c.547G>A | p.Ala183Thr | missense_variant | 5/16 | ENST00000265433.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
NBN | ENST00000265433.8 | c.547G>A | p.Ala183Thr | missense_variant | 5/16 | 1 | NM_002485.5 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.0000263 AC: 4AN: 152118Hom.: 0 Cov.: 33
GnomAD3 exomes AF: 0.0000159 AC: 4AN: 251320Hom.: 0 AF XY: 0.0000221 AC XY: 3AN XY: 135832
GnomAD4 exome AF: 0.0000165 AC: 24AN: 1453308Hom.: 0 Cov.: 29 AF XY: 0.0000221 AC XY: 16AN XY: 723648
GnomAD4 genome ? AF: 0.0000263 AC: 4AN: 152118Hom.: 0 Cov.: 33 AF XY: 0.0000538 AC XY: 4AN XY: 74292
ClinVar
Submissions by phenotype
Microcephaly, normal intelligence and immunodeficiency Uncertain:3
Uncertain significance, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Nov 07, 2021 | - - |
Uncertain significance, no assertion criteria provided | clinical testing | Natera, Inc. | Jul 03, 2021 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Dec 09, 2023 | This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 183 of the NBN protein (p.Ala183Thr). This variant is present in population databases (rs151070415, gnomAD 0.01%). This missense change has been observed in individual(s) with breast cancer (PMID: 31512090). ClinVar contains an entry for this variant (Variation ID: 411786). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The threonine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. - |
not provided Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Oct 06, 2016 | Variant summary: The NBN c.547G>A (p.Ala183Thr) variant indicated to be located at the last amino position of the BRCT domain (via InterPro) causes a missense change involving a conserved nucleotide with 4/4 in silico tools (SNPs&GO not captured here due to low reliability index) predict a damaging outcome, although these predictions have yet to be functionally assessed. The variant of interest was observed in the large, broad control population, ExAC, with an allele frequency of 1/121276, which does not exceed the estimated maximal expected allele frequency for a pathogenic NBN variant of 1/400. The variant of interest has not, to our knowledge, been reported in affected individuals via publications and/or reputable databases/clinical diagnostic laboratories. Therefore, until additional information becomes available (ie, clinical and/or functional studies), the variant of interest has been classified as a "Variant of Uncertain Significance." - |
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Mar 17, 2023 | Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Observed in an individual with breast cancer (Scarpitta et al., 2019); This variant is associated with the following publications: (PMID: 24894818, 16188882, 34072463, 31512090) - |
Hereditary cancer-predisposing syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Jan 12, 2023 | The p.A183T variant (also known as c.547G>A), located in coding exon 5 of the NBN gene, results from a G to A substitution at nucleotide position 547. The alanine at codon 183 is replaced by threonine, an amino acid with similar properties. This variant has been reported in 1/81 male breast cancer patients who had multi-gene panel testing (Scarpitta R et al. Breast Cancer Res Treat, 2019 Dec;178:557-564). This amino acid position is well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at