NM_005633.4:c.3322G>A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BS1BP5

This summary comes from the ClinGen Evidence Repository: The c.3322G>A (p.Asp1108Asn) variant in SOS1 was present in 0.039% (10/13658 with 95% CI) of Latino alleles in gnomAD v3 (BS1). This variant has been identified in a patient with Noonan syndrome who had an alternate molecular basis for disease (BP5; SCV000966758.1; ClinVar ID: 44603). It was also identified in a homozygous state in an individual who also carried a variant in TRMT1 (BP5 not met; Baylor College of Medicine internal data). In summary, this variant meets criteria to be classified as likely benign. RASopathy-specific ACMG/AMP criteria applied (PMID:29493581): BS1, BP5. LINK:https://erepo.genome.network/evrepo/ui/classification/CA1624224/MONDO:0021060/004

Frequency

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

Exomes 𝑓: 0.0000096 ( 0 hom. )

Consequence

SOS1
NM_005633.4 missense

Scores

Clinical Significance

Likely benign reviewed by expert panel U:3B:3

Conservation

PhyloP100: 7.21

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

Noonan syndrome
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
Noonan syndrome 4
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, G2P, PanelApp Australia, Labcorp Genetics (formerly Invitae)
fibromatosis, gingival, 1
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
hereditary gingival fibromatosis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
cardiofaciocutaneous syndrome
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
Costello syndrome
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

SOS1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

BP5

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

BS1

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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005633.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
SOS1	NM_005633.4	MANE Select	c.3322G>A	p.Asp1108Asn	missense	Exon 20 of 23	NP_005624.2
SOS1	NM_001382394.1		c.3301G>A	p.Asp1101Asn	missense	Exon 20 of 23	NP_001369323.1
SOS1	NM_001382395.1		c.3322G>A	p.Asp1108Asn	missense	Exon 20 of 22	NP_001369324.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
SOS1	ENST00000402219.8	TSL:1 MANE Select	c.3322G>A	p.Asp1108Asn	missense	Exon 20 of 23	ENSP00000384675.2
SOS1	ENST00000395038.6	TSL:5	c.3322G>A	p.Asp1108Asn	missense	Exon 20 of 22	ENSP00000378479.2
SOS1	ENST00000692089.1		c.3211G>A	p.Asp1071Asn	missense	Exon 19 of 22	ENSP00000508626.1

Frequencies

GnomAD3 genomes

AF:

0.0000920

AC:

AN:

152168

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000785

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:

0.000478

GnomAD2 exomes

AF:

0.0000279

AC:

AN:

250752

AF XY:

0.0000369

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000116

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000884

Gnomad OTH exome

AF:

0.000327

GnomAD4 exome

AF:

0.00000958

AC:

AN:

1461638

Hom.:

Cov.:

AF XY:

0.0000110

AC XY:

AN XY:

727124

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33470

American (AMR)

AF:

0.000157

AC:

AN:

44718

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26128

East Asian (EAS)

AF:

0.00

AC:

AN:

39680

South Asian (SAS)

AF:

0.00

AC:

AN:

86210

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53410

Middle Eastern (MID)

AF:

0.000347

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00000360

AC:

AN:

1111874

Other (OTH)

AF:

0.0000166

AC:

AN:

60382

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.486

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000919

AC:

AN:

152286

Hom.:

Cov.:

AF XY:

0.0000940

AC XY:

AN XY:

74462

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41558

American (AMR)

AF:

0.000784

AC:

AN:

15300

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.00

AC:

AN:

4820

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10604

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68030

Other (OTH)

AF:

0.000473

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.486

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000292

Hom.:

Bravo

AF:

0.000181

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Likely benign

Submissions summary: Uncertain:3Benign:3

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

not specified

Uncertain:2

May 02, 2018

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.Asp1108Asn variant has not been previously reported in individuals with cl inical features of a RASopathy disorder, but has been reported in ClinVar (Varia tion ID: 238770). This variant has been identified in 4/33558 Latino chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; d bSNP rs199856844). Please note that for diseases with clinical variability, redu ced penetrance, or recessive inheritance, pathogenic variants may be present at a low frequency in the general population. Computational prediction tools and co nservation analysis suggest that the p.Asp1108Asn variant may not impact the pro tein, though this information is not predictive enough to rule out pathogenicity . In summary, the clinical significance of the p.Asp1108Asn variant is uncertain . ACMG/AMP Criteria applied: BP4.

Jun 19, 2025

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

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: SOS1 c.3322G>A (p.Asp1108Asn) results in a conservative amino acid change in the encoded protein sequence. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change. The variant allele was found at a frequency of 2.8e-05 in 250752 control chromosomes, predominantly at a frequency of 0.00012 within the Latino subpopulation in the gnomAD v2 database. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.3322G>A in individuals affected with Noonan Syndrome and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 240197). Based on the evidence outlined above, the variant was classified as uncertain significance for Noonan Syndrome And Related Conditions.

RASopathy

Benign:2

Dec 10, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jun 25, 2020

ClinGen RASopathy Variant Curation Expert Panel

Significance:Likely benign

Review Status:reviewed by expert panel

Collection Method:curation

The c.3322G>A (p.Asp1108Asn) variant in SOS1 was present in 0.039% (10/13658 with 95% CI) of Latino alleles in gnomAD v3 (BS1). This variant has been identified in a patient with Noonan syndrome who had an alternate molecular basis for disease (BP5; SCV000966758.1; ClinVar ID: 44603). It was also identified in a homozygous state in an individual who also carried a variant in TRMT1 (BP5 not met; Baylor College of Medicine internal data). In summary, this variant meets criteria to be classified as likely benign. RASopathy-specific ACMG/AMP criteria applied (PMID:29493581): BS1, BP5.

Cardiovascular phenotype

Uncertain:1

Aug 05, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.3322G>A (p.D1108N) alteration is located in exon 20 (coding exon 20) of the SOS1 gene. This alteration results from a G to A substitution at nucleotide position 3322, causing the aspartic acid (D) at amino acid position 1108 to be replaced by an asparagine (N). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear.

not provided

Benign:1

Mar 22, 2021

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.081

BayesDel_addAF

Benign

-0.28

BayesDel_noAF

Benign

-0.41

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.33

Eigen

Benign

0.075

Eigen_PC

Uncertain

0.22

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.88

M_CAP

Benign

0.016

MetaRNN

Benign

0.071

MetaSVM

Benign

-0.70

MutationAssessor

Benign

1.7

PhyloP100

7.2

PrimateAI

Uncertain

0.77

PROVEAN

Benign

-0.46

REVEL

Benign

0.21

Sift

Benign

0.23

Sift4G

Benign

0.32

Polyphen

0.38

Vest4

0.38

MVP

0.75

MPC

0.14

ClinPred

0.25

GERP RS

5.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.070

gMVP

0.36

Mutation Taster

=89/11

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.13

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over