rs201352584

Positions:

chr2-39058785-A-C

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PP3_ModerateBP6BS2

The NM_005633.4(SOS1):c.233T>G(p.Phe78Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000128 in 1,612,396 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00017 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00012 ( 0 hom. )

Consequence

SOS1
NM_005633.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:7B:2

Conservation

PhyloP100: 9.20

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:

SOS1 (HGNC:):

SOS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.89

BP6

Variant 2-39058785-A-C is Benign according to our data. Variant chr2-39058785-A-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 40646.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=7, Benign=1}. Variant chr2-39058785-A-C is described in Lovd as [Benign].

BS2

High AC in GnomAd4 at 26 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SOS1	NM_005633.4 linkuse as main transcript	c.233T>G	p.Phe78Cys	missense_variant	3/23	ENST00000402219.8	NP_005624.2	Q07889-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SOS1	ENST00000402219.8 linkuse as main transcript	c.233T>G	p.Phe78Cys	missense_variant	3/23	1	NM_005633.4	ENSP00000384675.2		Q07889-1

Frequencies

GnomAD3 genomes

AF:

0.000171

AC:

AN:

152124

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000188

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000324

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000116

AC:

AN:

250656

Hom.:

AF XY:

0.000111

AC XY:

AN XY:

135582

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000277

Gnomad NFE exome

AF:

0.000203

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000124

AC:

181

AN:

1460272

Hom.:

Cov.:

AF XY:

0.000113

AC XY:

AN XY:

726484

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

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:

0.000206

Gnomad4 NFE exome

AF:

0.000145

Gnomad4 OTH exome

AF:

0.000133

GnomAD4 genome

AF:

0.000171

AC:

AN:

152124

Hom.:

Cov.:

AF XY:

0.000242

AC XY:

AN XY:

74294

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000188

Gnomad4 NFE

AF:

0.000324

Gnomad4 OTH

AF:

0.000478

Alfa

AF:

0.000218

Hom.:

Bravo

AF:

0.000110

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000123

AC:

EpiCase

AF:

0.000218

EpiControl

AF:

0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:7Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Mar 01, 2024	SOS1: PP3 -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Sep 24, 2018	This variant is associated with the following publications: (PMID: 24939586, 17586837, 21387466) -
Uncertain significance, criteria provided, single submitter	clinical testing	Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics	May 30, 2017	- -

Noonan syndrome 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Mendelics

May 28, 2019

- -

Noonan syndrome 4

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

New York Genome Center

Dec 01, 2021

The c.233T>G (p.Phe78Cys) variant identified in the SOS1 gene substitues a Phenylalnine for Cysteine at amino acid 78/1334 (coding exon 2/23). It is identified in gnomAD (44 heterozygotes, 0 homozygotes; allele frequency 1.56e-4) and ExAC (15 heterozygotes, 0 homozygotes; allele frequency: 1.24e-4. In silico algorithms predict this variant will be Deleterious (Provean; Score: -7.01) and Damaging (SIFT;Score: 0.00) to the function of the canonical transcript. The c.233T>G (p.Phe78Cys) variant is reported in ClinVar as a Variant of Uncertain Significance (VarID:40646), and has been described in two individuals in the literature who met clinical criteriafor Noonan syndrome [doi:10.4183/aeb.2014.463; PMID: 17586837], one of which was inherited from a presumably unaffected parent [PMID: 17586837]. Given the lack of compelling information supporting the pathogenicity of the c.233T>G (p.Phe78Cys) variant identified in this indivudal, it is reported here as a Variant of Uncertain Significance. -

SOS1-related disorder

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Mar 01, 2023

The SOS1 c.233T>G variant is predicted to result in the amino acid substitution p.Phe78Cys. This variant was reported in a patient with Noonan syndrome as well as their mother who was said to be clinically unaffected but was not available for phenotypic examination (Zenker et al. 2007. PubMed ID: 17586837). This variant is reported in 0.028% of alleles in individuals of European (Non-Finnish) descent in gnomAD (http://gnomad.broadinstitute.org/variant/2-39285926-A-C), which is likely to high to be a primary cause of disease (Gelb et al. 2018. PubMed ID: 29493581). Although we suspect that this variant may be benign, at this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Ventricular tachycardia

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Center for Advanced Laboratory Medicine, UC San Diego Health, University of California San Diego

Jan 31, 2019

- -

RASopathy

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 22, 2024

This sequence change replaces phenylalanine, which is neutral and non-polar, with cysteine, which is neutral and slightly polar, at codon 78 of the SOS1 protein (p.Phe78Cys). This variant is present in population databases (rs201352584, gnomAD 0.03%), and has an allele count higher than expected for a pathogenic variant. This missense change has been observed in individual(s) with SOS1-related conditions (PMID: 17586837). ClinVar contains an entry for this variant (Variation ID: 40646). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt SOS1 protein function with a positive predictive value of 95%. 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. -

Cardiovascular phenotype

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 21, 2022

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

1.0

BayesDel_addAF

Pathogenic

0.19

BayesDel_noAF

Pathogenic

0.41

CADD

Pathogenic

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.77

D;D;T;T

Eigen

Pathogenic

0.92

Eigen_PC

Pathogenic

0.88

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

1.0

.;D;D;D

M_CAP

Pathogenic

0.47

MetaRNN

Pathogenic

0.89

D;D;D;D

MetaSVM

Uncertain

0.76

MutationAssessor

Pathogenic

2.9

M;M;.;.

PrimateAI

Pathogenic

0.89

PROVEAN

Pathogenic

-7.1

D;D;D;D

REVEL

Pathogenic

0.86

Sift

Pathogenic

0.0

D;D;D;D

Sift4G

Pathogenic

0.0

D;D;D;.

Polyphen

1.0

D;D;.;.

Vest4

0.97

MVP

0.98

MPC

1.8

ClinPred

0.89

GERP RS

5.6

Varity_R

0.95

gMVP

0.86

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

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