2-39058774-T-C

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4BS2

The NM_005633.4(SOS1):c.244A>G(p.Ile82Val) variant causes a missense change. The variant allele was found at a frequency of 0.0000354 in 1,612,340 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000079 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000031 ( 0 hom. )

Consequence

SOS1
NM_005633.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:1

Conservation

PhyloP100: 6.17

Variant links:

Genes affected

SOS1 (HGNC:11187): (SOS Ras/Rac guanine nucleotide exchange factor 1) This gene encodes a protein that is a guanine nucleotide exchange factor for RAS proteins, membrane proteins that bind guanine nucleotides and participate in signal transduction pathways. GTP binding activates and GTP hydrolysis inactivates RAS proteins. The product of this gene may regulate RAS proteins by facilitating the exchange of GTP for GDP. Mutations in this gene are associated with gingival fibromatosis 1 and Noonan syndrome type 4. [provided by RefSeq, Jul 2008]

SOS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.40500128).

BS2

High AC in GnomAd4 at 12 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SOS1	NM_005633.4 link	c.244A>G	p.Ile82Val	missense_variant	Exon 3 of 23	ENST00000402219.8	NP_005624.2	Q07889-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SOS1	ENST00000402219.8 link	c.244A>G	p.Ile82Val	missense_variant	Exon 3 of 23	1	NM_005633.4	ENSP00000384675.2		Q07889-1

Frequencies

GnomAD3 genomes

AF:

0.0000789

AC:

AN:

152026

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000942

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000589

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000439

AC:

AN:

250518

Hom.:

AF XY:

0.0000517

AC XY:

AN XY:

135462

show subpopulations

Gnomad AFR exome

AF:

0.000124

Gnomad AMR exome

AF:

0.0000581

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000329

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000353

Gnomad OTH exome

AF:

0.000327

GnomAD4 exome

AF:

0.0000308

AC:

AN:

1460314

Hom.:

Cov.:

AF XY:

0.0000289

AC XY:

AN XY:

726446

show subpopulations

Gnomad4 AFR exome

AF:

0.0000897

Gnomad4 AMR exome

AF:

0.0000448

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.0000759

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000243

Gnomad4 OTH exome

AF:

0.0000829

GnomAD4 genome

AF:

0.0000789

AC:

AN:

152026

Hom.:

Cov.:

AF XY:

0.0000539

AC XY:

AN XY:

74234

show subpopulations

Gnomad4 AFR

AF:

0.000145

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000942

Gnomad4 NFE

AF:

0.0000589

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.000106

ExAC

AF:

0.0000330

AC:

EpiCase

AF:

0.0000546

EpiControl

AF:

0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jul 09, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant classified as Uncertain Significance - Favor Benign. The p.Ile82Val vari ant in SOS1 has been identified by our laboratory in 1 child with Shone's comple x and 1 infant with clinical features of Noonan syndrome; however, both of these individuals inherited this variant from reportedly unaffected parents. This var iant has also been identified in 2/66566 European chromosomes by the Exome Aggre gation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs397517157). Com putational prediction tools and conservation analysis do not provide strong supp ort for or against an impact to the protein. In summary, while the clinical sign ificance of the p.Ile82val variant is uncertain, the identification of this vari ant in an individual with unrelated features and inheritance from unaffected par ents suggest that it is more likely to be benign. -

Noonan syndrome

Uncertain:1

Service de Génétique Moléculaire, Hôpital Robert Debré

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Cardiovascular phenotype

Uncertain:1

Mar 25, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.I82V variant (also known as c.244A>G), located in coding exon 3 of the SOS1 gene, results from an A to G substitution at nucleotide position 244. The isoleucine at codon 82 is replaced by valine, an amino acid with highly similar properties. This alteration has been reported in a cohort of children with multiple cafe-au-lait macules; however, clinical details were limited (Castellanos E et al. Clin Genet, 2020 02;97:264-275). This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Based on the available evidence, the clinical significance of this alteration remains unclear. -

RASopathy

Uncertain:1

Jan 23, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 82 of the SOS1 protein (p.Ile82Val). This variant is present in population databases (rs397517157, gnomAD 0.02%). This missense change has been observed in individual(s) with Shone's complex or clinical features of Noonan syndrome (ClinVar Variation ID: 45351). ClinVar contains an entry for this variant (Variation ID: 45351). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed for this missense variant. However, the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on SOS1 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

Benign:1

Mar 18, 2025

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

See Variant Classification Assertion Criteria. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.55

BayesDel_addAF

Benign

-0.021

BayesDel_noAF

Uncertain

-0.030

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.51

D;D;T;T

Eigen

Pathogenic

0.80

Eigen_PC

Pathogenic

0.77

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.86

.;D;D;T

M_CAP

Benign

0.083

MetaRNN

Benign

0.41

T;T;T;T

MetaSVM

Uncertain

0.65

MutationAssessor

Uncertain

2.8

M;M;.;.

PrimateAI

Uncertain

0.75

PROVEAN

Benign

-0.91

N;N;N;N

REVEL

Uncertain

0.42

Sift

Benign

0.059

T;T;D;D

Sift4G

Uncertain

0.0070

D;D;D;.

Polyphen

0.98

D;D;.;.

Vest4

0.50

MutPred

0.19

Gain of loop (P = 0.0435);Gain of loop (P = 0.0435);Gain of loop (P = 0.0435);.;

MVP

0.89

MPC

1.4

ClinPred

0.48

GERP RS

5.8

Varity_R

0.27

gMVP

0.33

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.11

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over