rs139290271

Positions:

chr2-39051259-A-G

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BA1

This summary comes from the ClinGen Evidence Repository: The filtering allele frequency of the c.749T>C (p.Val250Ala) variant in the SOS1 gene is 0.089% for African chromosomes by the Exome Aggregation Consortium (15/10392 with 95% CI), which is a high enough frequency to be classified as benign based on thresholds defined by the ClinGen RASopathy Expert panel for autosomal dominant RASopathy variants (BA1). LINK:https://erepo.genome.network/evrepo/ui/classification/CA136183/MONDO:0021060/004

Frequency

Genomes: 𝑓 0.00048 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000048 ( 0 hom. )

Consequence

SOS1
NM_005633.4 missense

Scores

Clinical Significance

Benign reviewed by expert panel U:5B:8

Conservation

PhyloP100: 4.05

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 Benign. Variant got -8 ACMG points.

BA1

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SOS1	NM_005633.4 linkuse as main transcript	c.749T>C	p.Val250Ala	missense_variant	6/23	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.749T>C	p.Val250Ala	missense_variant	6/23	1	NM_005633.4	ENSP00000384675.2		Q07889-1

Frequencies

GnomAD3 genomes

AF:

0.000480

AC:

AN:

152178

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00154

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00191

GnomAD3 exomes

AF:

0.000155

AC:

AN:

251268

Hom.:

AF XY:

0.000118

AC XY:

AN XY:

135818

show subpopulations

Gnomad AFR exome

AF:

0.00135

Gnomad AMR exome

AF:

0.000347

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000352

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000480

AC:

AN:

1459094

Hom.:

Cov.:

AF XY:

0.0000427

AC XY:

AN XY:

726104

show subpopulations

Gnomad4 AFR exome

AF:

0.00126

Gnomad4 AMR exome

AF:

0.000335

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:

0.00000541

Gnomad4 OTH exome

AF:

0.000116

GnomAD4 genome

AF:

0.000479

AC:

AN:

152296

Hom.:

Cov.:

AF XY:

0.000376

AC XY:

AN XY:

74476

show subpopulations

Gnomad4 AFR

AF:

0.00154

Gnomad4 AMR

AF:

0.000262

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00189

Alfa

AF:

0.0000959

Hom.:

Bravo

AF:

0.000657

ESP6500AA

AF:

0.00136

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000198

AC:

ClinVar

Significance: Benign

Submissions summary: Uncertain:5Benign:8

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:2

Benign, criteria provided, single submitter	clinical testing	GeneDx	Oct 25, 2019	- -
Likely benign, criteria provided, single submitter	clinical testing	Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics	Oct 11, 2016	- -
Uncertain significance, no assertion criteria provided	clinical testing	Greenwood Genetic Center Diagnostic Laboratories, Greenwood Genetic Center	Jan 15, 2015	- -
Uncertain significance, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Dec 22, 2017	- -

not specified

Uncertain:2Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Jun 01, 2011	Variant classified as Uncertain Significance - Favor Benign. The Val250Ala varia nt has not been previously reported in the literature. However, this variant was identified in one other Black individual tested by our laboratory and that indi vidual's reportedly unaffected mother. This variant has now been identified in 2 /75 (2.7%) of Black probands tested by our laboratory. In addition, Val at posit ion 250 is not conserved across evolutionarily distinct species and computationa l analyses (PolyPhen2, SIFT, AlignGVGD) predict that this variant will not impac t the normal function of the protein. It should be noted that the sensitivity an d specificity of these computational programs has not been determined by our lab oratory. Therefore, the clinical significance of this variant cannot be determin ed conclusively at this time; however, based upon the arguments described above we would lean towards a more likely benign role. -
Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	May 13, 2018	Variant summary: SOS1 c.749T>C (p.Val250Ala) results in a non-conservative amino acid change located in the Dbl homology (DH) domain of the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00017 in 277018 control chromosomes. The observed variant frequency is approximately 6 fold above the estimated maximal expected allele frequency for a pathogenic variant in SOS1 causing Noonan Syndrome and Related Conditions phenotype (3e-05), strongly suggesting that the variant is benign. To our knowledge, no occurrence of c.749T>C in individuals affected with Noonan Syndrome and Related Conditions and no experimental evidence demonstrating its impact on protein function have been reported. Six clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 with conflicting assessments, including uncertain significance (2x), likely benign (3x), and benign (1x). Based on the evidence outlined above, the variant was classified as likely benign. -
Uncertain significance, criteria provided, single submitter	clinical testing	Molecular Diagnostics Lab, Nemours Children's Health, Delaware	Jul 21, 2015	- -

RASopathy

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 24, 2024	- -
Benign, reviewed by expert panel	curation	ClinGen RASopathy Variant Curation Expert Panel	Apr 03, 2017	The filtering allele frequency of the c.749T>C (p.Val250Ala) variant in the SOS1 gene is 0.089% for African chromosomes by the Exome Aggregation Consortium (15/10392 with 95% CI), which is a high enough frequency to be classified as benign based on thresholds defined by the ClinGen RASopathy Expert panel for autosomal dominant RASopathy variants (BA1). -

Noonan syndrome and Noonan-related syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Dec 12, 2016

- -

SOS1-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Nov 20, 2019

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

Noonan syndrome

Benign:1

Likely benign, no assertion criteria provided

clinical testing

Service de Génétique Moléculaire, Hôpital Robert Debré

- -

Cardiovascular phenotype

Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 28, 2019

This alteration is classified as 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

Benign

0.072

BayesDel_addAF

Benign

-0.47

BayesDel_noAF

Benign

-0.49

CADD

Benign

DANN

Benign

0.94

DEOGEN2

Benign

0.35

T;T;T

Eigen

Benign

-0.32

Eigen_PC

Benign

-0.12

FATHMM_MKL

Uncertain

0.89

LIST_S2

Benign

0.63

.;T;T

M_CAP

Benign

0.010

MetaRNN

Benign

0.027

T;T;T

MetaSVM

Benign

-0.99

MutationAssessor

Benign

0.0

N;N;.

PrimateAI

Uncertain

0.60

PROVEAN

Benign

-1.2

N;N;N

REVEL

Benign

0.13

Sift

Benign

0.52

T;T;T

Sift4G

Benign

0.70

T;T;T

Polyphen

0.0

B;B;.

Vest4

0.14

MVP

0.33

MPC

0.68

ClinPred

0.030

GERP RS

3.3

Varity_R

0.15

gMVP

0.22

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

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