Genetic Variant SOS1:c.1203-20T>C (chr2-39023245-A-G) – ACMG Classification: Benign (-20 pts)

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_005633.4(SOS1):c.1203-20T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00821 in 1,590,624 control chromosomes in the GnomAD database, including 86 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.010 ( 10 hom., cov: 32)

Exomes 𝑓: 0.0080 ( 76 hom. )

Consequence

SOS1
NM_005633.4 intron

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:11

Conservation

PhyloP100: 1.48

Publications

2 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: Labcorp Genetics (formerly Invitae), G2P, PanelApp Australia, Genomics England PanelApp
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
Noonan syndrome with multiple lentigines
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
Noonan syndrome-like disorder with loose anagen hair
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: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.88).

BP6

Variant 2-39023245-A-G is Benign according to our data. Variant chr2-39023245-A-G is described in ClinVar as Benign. ClinVar VariationId is 139235.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population amr. GnomAd4 allele frequency = 0.0103 (1571/152248) while in subpopulation AMR AF = 0.018 (275/15282). AF 95% confidence interval is 0.0162. There are 10 homozygotes in GnomAd4. There are 797 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 1571 AD gene.

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	Effect	Exon Rank	Protein	UniProt
SOS1	NM_005633.4	MANE Select	c.1203-20T>C	intron	N/A	NP_005624.2
SOS1	NM_001382394.1		c.1182-20T>C	intron	N/A	NP_001369323.1
SOS1	NM_001382395.1		c.1203-20T>C	intron	N/A	NP_001369324.1	G5E9C8

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
SOS1	ENST00000402219.8	TSL:1 MANE Select	c.1203-20T>C	intron	N/A	ENSP00000384675.2	Q07889-1
SOS1	ENST00000395038.6	TSL:5	c.1203-20T>C	intron	N/A	ENSP00000378479.2	G5E9C8
SOS1	ENST00000913801.1		c.1203-20T>C	intron	N/A	ENSP00000583860.1

Frequencies

GnomAD3 genomes

AF:

0.0103

AC:

1570

AN:

152130

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0104

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0181

Gnomad ASJ

AF:

0.0107

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00103

Gnomad FIN

AF:

0.0184

Gnomad MID

AF:

0.0253

Gnomad NFE

AF:

0.00857

Gnomad OTH

AF:

0.0172

GnomAD2 exomes

AF:

0.00938

AC:

2313

AN:

246642

AF XY:

0.00904

show subpopulations

Gnomad AFR exome

AF:

0.00924

Gnomad AMR exome

AF:

0.0139

Gnomad ASJ exome

AF:

0.0118

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0181

Gnomad NFE exome

AF:

0.00906

Gnomad OTH exome

AF:

0.0216

GnomAD4 exome

AF:

0.00798

AC:

11481

AN:

1438376

Hom.:

Cov.:

AF XY:

0.00792

AC XY:

5680

AN XY:

717100

show subpopulations

African (AFR)

AF:

0.00965

AC:

318

AN:

32970

American (AMR)

AF:

0.0148

AC:

659

AN:

44546

Ashkenazi Jewish (ASJ)

AF:

0.0118

AC:

306

AN:

25958

East Asian (EAS)

AF:

0.00

AC:

AN:

39530

South Asian (SAS)

AF:

0.00148

AC:

127

AN:

85644

European-Finnish (FIN)

AF:

0.0173

AC:

911

AN:

52544

Middle Eastern (MID)

AF:

0.0400

AC:

229

AN:

5728

European-Non Finnish (NFE)

AF:

0.00752

AC:

8215

AN:

1091930

Other (OTH)

AF:

0.0120

AC:

716

AN:

59526

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.485

Heterozygous variant carriers

567

1133

1700

2266

2833

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

304

608

912

1216

1520

<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:

0.0103

AC:

1571

AN:

152248

Hom.:

Cov.:

AF XY:

0.0107

AC XY:

797

AN XY:

74458

show subpopulations

African (AFR)

AF:

0.0104

AC:

433

AN:

41582

American (AMR)

AF:

0.0180

AC:

275

AN:

15282

Ashkenazi Jewish (ASJ)

AF:

0.0107

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5196

South Asian (SAS)

AF:

0.00103

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.0184

AC:

195

AN:

10624

Middle Eastern (MID)

AF:

0.0272

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00857

AC:

582

AN:

67942

Other (OTH)

AF:

0.0170

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.497

Heterozygous variant carriers

150

226

301

376

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<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:

0.0105

Hom.:

Bravo

AF:

0.0111

Asia WGS

AF:

0.00144

AC:

AN:

3478

ClinVar

ClinVar submissions

Significance:Benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not specified (5)

not provided (3)

Fibromatosis, gingival, 1 (1)

Noonan syndrome 4 (1)

RASopathy (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.88

CADD

Benign

(source)

DANN

Benign

0.57

PhyloP100

1.5

Mutation Taster

=100/0

polymorphism

(source)

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

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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

Computational scores

Splicing

Publications

Other links and lift over