rs555034652

chr3-12600208-C-Gchr3-12600208-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 5P and 4B. PM1 PM2 PP2 BP4_Strong

The NM_002880.4(RAF1):c.934G>C(p.Val312Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another nucleotide change resulting in same amino acid change has been previously reported as Uncertain significancein ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V312A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: RAF1 NM_002880.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.37

Genes affected

RAF1 (HGNC:9829): (Raf-1 proto-oncogene, serine/threonine kinase) This gene is the cellular homolog of viral raf gene (v-raf). The encoded protein is a MAP kinase kinase kinase (MAP3K), which functions downstream of the Ras family of membrane associated GTPases to which it binds directly. Once activated, the cellular RAF1 protein can phosphorylate to activate the dual specificity protein kinases MEK1 and MEK2, which in turn phosphorylate to activate the serine/threonine specific protein kinases, ERK1 and ERK2. Activated ERKs are pleiotropic effectors of cell physiology and play an important role in the control of gene expression involved in the cell division cycle, apoptosis, cell differentiation and cell migration. Mutations in this gene are associated with Noonan syndrome 5 and LEOPARD syndrome 2. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM1: In a region_of_interest Disordered (size 114) in uniprot entity RAF1_HUMAN there are 52 pathogenic changes around while only 18 benign (74%) in NM_002880.4
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, RAF1
• BP4: Computational evidence support a benign effect (MetaRNN=0.057960004).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RAF1	NM_002880.4	c.934G>C	p.Val312Leu	missense_variant	9/17	ENST00000251849.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RAF1	ENST00000251849.9	c.934G>C	p.Val312Leu	missense_variant	9/17	1	NM_002880.4	P3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Dec 03, 2015

A novel variant of uncertain significance has been identified in the RAF1 gene. The V312L variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. This variant was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. This substitution occurs at a position where only amino acids with similar properties to Valine are tolerated across species. However, the V312L variant is a conservative amino acid substitution, which is not likely to impact secondary protein structure as these residues share similar properties. In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. Furthermore, only one missense variant in a nearby residue (T310A) has been reported in the Human Gene Mutation Database in association with DCM (Stenson et al., 2014). Therefore, based on the currently available information, it is unclear whether this variant is pathogenic or benign. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.084
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.39
Cadd	Benign	5.2
Dann	Benign	0.70
DEOGEN2	Benign	0.35	T;.;T
Eigen	Benign	-0.84
Eigen_PC	Benign	-0.66
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.40	T;T;T
M_CAP	Benign	0.028	D
MetaRNN	Benign	0.058	T;T;T
MetaSVM	Benign	-0.95	T
MutationAssessor	Benign	0.69	N;.;.
MutationTaster	Benign	0.99	D;D;D;D
PrimateAI	Benign	0.36	T
PROVEAN	Benign	0.060	N;N;N
REVEL	Benign	0.11
Sift	Benign	1.0	T;T;T
Sift4G	Benign	0.45	T;T;T
Polyphen		0.0010	B;.;.
Vest4		0.13
MutPred		0.20		Loss of glycosylation at P308 (P = 0.0348);.;.;
MVP		0.35
MPC		0.45
ClinPred		0.042	T
GERP RS		3.0
Varity_R		0.046
gMVP		0.46

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

LitVar

Other links and lift over

dbSNP: rs555034652; hg19: chr3-12641707;