chr2-39035268-G-A

Variant names:

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 1P and 9B. BP5BS4BS1PP2

This summary comes from the ClinGen Evidence Repository: The c.1018C>T (p.Pro340Ser) variant in the SOS1 gene has been found not to segregate in a family member of a patient who underwent testing for RASopathies as well as another adult who was unaffected (BS4; GeneDx, Invitae internal data; GTR Lab ID: 26957, 500031; SCV000514724.5, SCV000659124.2). This variant has also been identified in a patient with an alternate molecular basis of disease (BP5; PMID 22585553). The filtering allele frequency of the p.Pro340Ser variant is 0.022% for East Asian exomes in the gnomAD database (20/251276 with 95% CI), which is high enough frequency to be considered strong evidence for the variant being benign by the ClinGen RASopathy Expert Panel (BS1). In summary, this variant meets criteria to be classified as benign. RASopathy-specific ACMG/AMP criteria applied (PMID:29493581): BS4, BP5, BS1. LINK:https://erepo.genome.network/evrepo/ui/classification/CA1624660/MONDO:0021060/004

Frequency

Genomes: 𝑓 0.000092 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000031 ( 1 hom. )

Consequence

SOS1
NM_005633.4 missense

Scores

Clinical Significance

Benign reviewed by expert panel U:1B:7

Conservation

PhyloP100: 9.46

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 Benign. Variant got -8 ACMG points.

PP2

For more information check the summary or visit ClinGen Evidence Repository.

BP5

For more information check the summary or visit ClinGen Evidence Repository.

BS1

For more information check the summary or visit ClinGen Evidence Repository.

BS4

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SOS1	NM_005633.4 link	c.1018C>T	p.Pro340Ser	missense_variant	Exon 8 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.1018C>T	p.Pro340Ser	missense_variant	Exon 8 of 23	1	NM_005633.4	ENSP00000384675.2		Q07889-1

Frequencies

GnomAD3 genomes

AF:

0.0000920

AC:

AN:

152106

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000193

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000577

Gnomad SAS

AF:

0.000621

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000796

AC:

AN:

251276

Hom.:

AF XY:

0.0000736

AC XY:

AN XY:

135814

show subpopulations

Gnomad AFR exome

AF:

0.000246

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000436

Gnomad SAS exome

AF:

0.000261

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000315

AC:

AN:

1461624

Hom.:

Cov.:

AF XY:

0.0000413

AC XY:

AN XY:

727112

show subpopulations

Gnomad4 AFR exome

AF:

0.000149

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000126

Gnomad4 SAS exome

AF:

0.000267

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000180

Gnomad4 OTH exome

AF:

0.000182

GnomAD4 genome

AF:

0.0000920

AC:

AN:

152222

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

74428

show subpopulations

Gnomad4 AFR

AF:

0.000193

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000578

Gnomad4 SAS

AF:

0.000622

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000324

Hom.:

Bravo

AF:

0.0000642

ExAC

AF:

0.000115

AC:

Asia WGS

AF:

0.00375

AC:

AN:

3478

ClinVar

Significance: Benign

Submissions summary: Uncertain:1Benign:7

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

not provided

Benign:2

Jan 12, 2016

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The c.1018C>T variant affects a conserved nucleotide, resulting in amino acid change from Pro to Ser. 4/4 in-silico tools predict damaging outcome for this variant (SNPs&GO not captured due to low reliability index). 5/5 programs in Alamut predict that this variant does not affect normal splicing. ESE finder predicts that this variant may affect multiple ESE sites. However, these predictions are not confirmed by experimental studies. This variant has been reported in one patient with co-occurrence of PTPN11 c.1403C>T/p.T468M (pathogenic, Fahrner_2012). This variant is found in 14/119120 control chromosomes at a frequency of 0.0001175, which is about 4 times of maximal expected frequency of a pathogenic allele (0.00003), suggesting this variant is benign. Taken together, this variant was classified as likely benign. -

Jul 25, 2019

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is associated with the following publications: (PMID: 22585553, 32978145) -

Noonan syndrome 4

Uncertain:1

Apr 28, 2017

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

SOS1-related disorder

Benign:1

Sep 18, 2020

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Cardiovascular phenotype

Benign:1

Dec 04, 2020

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

Fibromatosis, gingival, 1

Benign:1

Apr 28, 2017

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. -

RASopathy

Benign:1

Jan 29, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Noonan syndrome and Noonan-related syndrome

Benign:1

Jun 27, 2019

ClinGen RASopathy Variant Curation Expert Panel

Significance: Benign

Review Status: reviewed by expert panel

Collection Method: curation

The c.1018C>T (p.Pro340Ser) variant in the SOS1 gene has been found not to segregate in a family member of a patient who underwent testing for RASopathies as well as another adult who was unaffected (BS4; GeneDx, Invitae internal data; GTR Lab ID: 26957, 500031; SCV000514724.5, SCV000659124.2). This variant has also been identified in a patient with an alternate molecular basis of disease (BP5; PMID 22585553). The filtering allele frequency of the p.Pro340Ser variant is 0.022% for East Asian exomes in the gnomAD database (20/251276 with 95% CI), which is high enough frequency to be considered strong evidence for the variant being benign by the ClinGen RASopathy Expert Panel (BS1). In summary, this variant meets criteria to be classified as benign. RASopathy-specific ACMG/AMP criteria applied (PMID:29493581): BS4, BP5, BS1. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.97

BayesDel_addAF

Uncertain

0.13

BayesDel_noAF

Pathogenic

0.28

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.78

D;D;T

Eigen

Pathogenic

1.0

Eigen_PC

Pathogenic

0.98

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.96

.;D;D

M_CAP

Uncertain

0.19

MetaRNN

Pathogenic

0.75

D;D;D

MetaSVM

Uncertain

0.0010

MutationAssessor

Uncertain

2.9

M;M;.

PrimateAI

Pathogenic

0.82

PROVEAN

Pathogenic

-7.1

D;D;D

REVEL

Uncertain

0.58

Sift

Pathogenic

0.0

D;D;D

Sift4G

Pathogenic

0.0

D;D;D

Polyphen

1.0

D;D;.

Vest4

0.93

MVP

0.82

MPC

1.5

ClinPred

0.85

GERP RS

6.0

Varity_R

0.89

gMVP

0.83

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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