5-39375054-T-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001343.4(DAB2):c.2278A>T(p.Met760Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,694 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: DAB2 NM_001343.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.395

Genes affected

DAB2 (HGNC:2662): (DAB adaptor protein 2) This gene encodes a mitogen-responsive phosphoprotein. It is expressed in normal ovarian epithelial cells, but is down-regulated or absent from ovarian carcinoma cell lines, suggesting its role as a tumor suppressor. This protein binds to the SH3 domains of GRB2, an adaptor protein that couples tyrosine kinase receptors to SOS (a guanine nucleotide exchange factor for Ras), via its C-terminal proline-rich sequences, and may thus modulate growth factor/Ras pathways by competing with SOS for binding to GRB2. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2011]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.052553773).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DAB2	NM_001343.4	c.2278A>T	p.Met760Leu	missense_variant	14/15	ENST00000320816.11
DAB2	NM_001244871.2	c.2215A>T	p.Met739Leu	missense_variant	13/14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DAB2	ENST00000320816.11	c.2278A>T	p.Met760Leu	missense_variant	14/15	1	NM_001343.4	P3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1459694 Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0 AN XY: 726268

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 28, 2022

The c.2278A>T (p.M760L) alteration is located in exon 14 (coding exon 13) of the DAB2 gene. This alteration results from a A to T substitution at nucleotide position 2278, causing the methionine (M) at amino acid position 760 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.089
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.73
Cadd	Benign	13
Dann	Benign	0.85
Eigen	Benign	-1.1
Eigen_PC	Benign	-0.95
FATHMM_MKL	Benign	0.55	D
LIST_S2	Benign	0.35	T;T;T;.
M_CAP	Benign	0.0041	T
MetaRNN	Benign	0.053	T;T;T;T
MetaSVM	Benign	-1.0	T
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.27	T
PROVEAN	Benign	-0.28	N;N;N;N
REVEL	Benign	0.058
Sift	Benign	0.36	T;T;T;T
Sift4G	Benign	0.53	T;T;T;T
Polyphen		0.0	B;.;B;B
Vest4		0.11
MutPred		0.20		.;.;Loss of catalytic residue at V756 (P = 0.0365);.;
MVP		0.18
MPC		0.061
ClinPred		0.24	T
GERP RS		-1.7
Varity_R		0.095
gMVP		0.10

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1754791312; hg19: chr5-39375156;