NM_005633.4:c.1931T>C

Variant names:

• chr2-39014774-A-G
• rs769891933
• NM_005633.4:c.1931T>C

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_005633.4(SOS1):​c.1931T>C​(p.Ile644Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000144 in 1,392,428 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). The gene SOS1 is included in the ClinGen Criteria Specification Registry.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: SOS1 NM_005633.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4 B:1
• Conservation: PhyloP100: 8.92
• Publications: 0 publications found

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

ACMG classification

Specifications for SOS1 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.814

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SOS1	NM_005633.4	MANE Select	c.1931T>C	p.Ile644Thr	missense	Exon 11 of 23	NP_005624.2
	SOS1	NM_001382394.1		c.1910T>C	p.Ile637Thr	missense	Exon 11 of 23	NP_001369323.1
	SOS1	NM_001382395.1		c.1931T>C	p.Ile644Thr	missense	Exon 11 of 22	NP_001369324.1	G5E9C8

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SOS1	ENST00000402219.8	TSL:1 MANE Select	c.1931T>C	p.Ile644Thr	missense	Exon 11 of 23	ENSP00000384675.2	Q07889-1
	SOS1	ENST00000395038.6	TSL:5	c.1931T>C	p.Ile644Thr	missense	Exon 11 of 22	ENSP00000378479.2	G5E9C8
	SOS1	ENST00000913801.1		c.1931T>C	p.Ile644Thr	missense	Exon 11 of 22	ENSP00000583860.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000800 AC: 2 AN: 250028 AF XY: 0.0000148

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000291

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000144 AC: 2 AN: 1392428 Hom.: 0 Cov.: 23 AF XY: 0.00000287 AC XY: 2 AN XY: 696742

African (AFR) AF: 0.00 AC: 0 AN: 32024

American (AMR) AF: 0.00 AC: 0 AN: 44544

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25636

East Asian (EAS) AF: 0.00 AC: 0 AN: 39176

South Asian (SAS) AF: 0.0000119 AC: 1 AN: 84152

European-Finnish (FIN) AF: 0.0000188 AC: 1 AN: 53210

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5604

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1050032

Other (OTH) AF: 0.00 AC: 0 AN: 58050

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ExAC AF: 0.00000824 AC: 1

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	-	Cardiovascular phenotype (1)
-	1	-	Fibromatosis, gingival, 1 (1)
-	1	-	Noonan syndrome 4 (1)
-	1	-	not specified (1)
-	-	1	RASopathy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.90
BayesDel_addAF	Benign	-0.031	T
BayesDel_noAF	Benign	-0.18
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.71	D
Eigen	Uncertain	0.30
Eigen_PC	Uncertain	0.44
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.96	D
M_CAP	Benign	0.022	T
MetaRNN	Pathogenic	0.81	D
MetaSVM	Benign	-0.80	T
MutationAssessor	Benign	1.5	L
PhyloP100		8.9
PrimateAI	Pathogenic	0.80	D
PROVEAN	Uncertain	-2.9	D
REVEL	Benign	0.29
Sift	Uncertain	0.011	D
Sift4G	Uncertain	0.017	D
Polyphen		0.15	B
Vest4		0.75
MutPred		0.72		Loss of stability (P = 0.0043)
MVP		0.53
MPC		0.86
ClinPred		0.89	D
GERP RS		5.8
Varity_R		0.54
gMVP		0.82
Mutation Taster		=55/45	polymorphism

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

Other links and lift over

dbSNP: rs769891933; hg19: chr2-39241915;