NM_006939.4:c.1861T>C

Variant names:

• chr14-50158638-A-G
• rs1555370029
• NM_006939.4:c.1861T>C

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_006939.4(SOS2):​c.1861T>C​(p.Phe621Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. F621V) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SOS2 NM_006939.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.03
• Publications: 0 publications found

Genes affected

SOS2 (HGNC:11188): (SOS Ras/Rho guanine nucleotide exchange factor 2) This gene encodes a regulatory protein that is involved in the positive regulation of ras proteins. Mutations in this gene are associated with Noonan Syndrome-9. [provided by RefSeq, Jul 2016]

SOS2 Gene-Disease associations (from GenCC):

• Noonan syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• Noonan syndrome 9

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Ambry Genetics, PanelApp Australia, G2P

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.936

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SOS2	NM_006939.4	c.1861T>C	p.Phe621Leu	missense_variant	Exon 11 of 23	ENST00000216373.10	NP_008870.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SOS2	ENST00000216373.10	c.1861T>C	p.Phe621Leu	missense_variant	Exon 11 of 23	1	NM_006939.4	ENSP00000216373.5
SOS2	ENST00000543680.5	c.1762T>C	p.Phe588Leu	missense_variant	Exon 10 of 22	1		ENSP00000445328.1
SOS2	ENST00000555794.2	c.973T>C	p.Phe325Leu	missense_variant	Exon 5 of 6	1		ENSP00000484766.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 26

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.20
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.58	D;.
Eigen	Pathogenic	0.74
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;D
M_CAP	Benign	0.042	D
MetaRNN	Pathogenic	0.94	D;D
MetaSVM	Benign	-0.30	T
MutationAssessor	Uncertain	2.1	M;.
PhyloP100		9.0
PrimateAI	Pathogenic	0.94	D
PROVEAN	Pathogenic	-4.9	D;D
REVEL	Pathogenic	0.74
Sift	Benign	0.078	T;T
Sift4G	Benign	0.063	T;T
Polyphen		0.94	P;.
Vest4		0.96
MutPred		0.85		Loss of helix (P = 0.0558);.;
MVP		0.83
MPC		1.5
ClinPred		0.98	D
GERP RS		5.4
Varity_R		0.77
gMVP		0.94
Mutation Taster		=14/86	disease causing

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: rs1555370029; hg19: chr14-50625356;