chr2-39056704-T-G

Variant names:

• chr2-39056704-T-G
• NM_005633.4:c.508A>C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM5

The NM_005633.4(SOS1):​c.508A>C​(p.Lys170Gln) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K170E) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SOS1 NM_005633.4 missense, splice_region
• Scores: Splicing: ADA: 0.7434
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.91

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-39056704-T-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SOS1	NM_005633.4	c.508A>C	p.Lys170Gln	missense_variant, splice_region_variant	Exon 4 of 23	ENST00000402219.8	NP_005624.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SOS1	ENST00000402219.8	c.508A>C	p.Lys170Gln	missense_variant, splice_region_variant	Exon 4 of 23	1	NM_005633.4	ENSP00000384675.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 27

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Jun 21, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); Missense variants in this gene are often considered pathogenic (HGMD); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge; This variant is associated with the following publications: (PMID: 29493581) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.47
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.84	D;D;T
Eigen	Pathogenic	0.68
Eigen_PC	Pathogenic	0.72
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.91	.;D;D
M_CAP	Benign	0.076	D
MetaRNN	Uncertain	0.68	D;D;D
MetaSVM	Uncertain	0.39	D
MutationAssessor	Benign	2.0	M;M;.
PrimateAI	Uncertain	0.77	T
PROVEAN	Benign	-2.1	N;N;N
REVEL	Pathogenic	0.71
Sift	Uncertain	0.018	D;D;D
Sift4G	Uncertain	0.037	D;D;D
Polyphen		1.0	D;D;.
Vest4		0.87
MutPred		0.56		Loss of ubiquitination at K170 (P = 0.0199);Loss of ubiquitination at K170 (P = 0.0199);Loss of ubiquitination at K170 (P = 0.0199);
MVP		0.80
MPC		0.93
ClinPred		0.87	D
GERP RS		5.8
Varity_R		0.85
gMVP		0.45

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.74
dbscSNV1_RF	Benign	0.61
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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-39283845;