13-32326282-G-T
Variant summary
Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM2PM5PP3_StrongPP5_Moderate
The NM_000059.4(BRCA2):c.516G>T(p.Lys172Asn) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K172?) has been classified as Pathogenic.
Frequency
Consequence
NM_000059.4 missense, splice_region
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 10 ACMG points.
Transcripts
RefSeq
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
BRCA2 | ENST00000380152.8 | c.516G>T | p.Lys172Asn | missense_variant, splice_region_variant | Exon 6 of 27 | 5 | NM_000059.4 | ENSP00000369497.3 | ||
BRCA2 | ENST00000530893.7 | c.147G>T | p.Lys49Asn | missense_variant, splice_region_variant | Exon 6 of 27 | 1 | ENSP00000499438.2 | |||
BRCA2 | ENST00000614259.2 | n.516G>T | splice_region_variant, non_coding_transcript_exon_variant | Exon 5 of 26 | 2 | ENSP00000506251.1 |
Frequencies
GnomAD3 genomes Cov.: 33
GnomAD4 exome Cov.: 31
GnomAD4 genome Cov.: 33
ClinVar
Submissions by phenotype
Hereditary cancer-predisposing syndrome Pathogenic:1
The c.516G>T variant (also known as p.K172N), located in coding exon 5 of the BRCA2 gene, results from a G to T substitution at nucleotide position 516. The amino acid change results in lysine to asparagine at codon 172, an amino acid with similar properties. However, this change occurs in the last base pair of coding exon 5, which makes it likely to have some effect on normal mRNA splicing. In silico splice site analysis predicts that this alteration will weaken the native splice donor site; however, direct evidence is insufficient at this time (Ambry internal data). Another alteration impacting the same donor site (BRCA2 c.516G>A) has been shown to result in multiple out-of-frame aberrant transcripts (Hansen TV et al. Breast Cancer Res Treat, 2010 Feb;119:547-50). Based on the majority of available evidence to date, this variant is likely to be pathogenic. -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at