NM_002880.4:c.775T>A

Variant names:

• chr3-12604195-A-T
• rs3730271
• NM_002880.4:c.775T>A

Variant summary

Our verdict is Pathogenic. The variant received 19 ACMG points: 19P and 0B. PP1 PP3 PP2 PM2_Supporting PM6_Strong PS4 PM5_Strong PS3_Supporting PM1

This summary comes from the ClinGen Evidence Repository: The c.775T>A (p.Ser259Thr) variant in the RAF1 gene is a missense variant predicted to cause substitution of serine by threonine at amino acid 259. This variant is absent from gnomAD v2 (PM2_Supporting). The computational predictor REVEL gives a score of 0.753, which is above the threshold of 0.7 and is evidence that correlates with impact to RAF1 function (PP3). The variant is located in the RAF1 gene, which has been defined by the ClinGen RASopathy Expert Panel as a gene with a low rate of benign missense variants and pathogenic missense variants are common (PP2; PMID:29493581). The variant is also in a location that has been defined by the ClinGen RASopathy Expert Panel to be a mutational hotspot or domain of RAF1 (PM1; PMID 29493581). The p.Ser259Thr variant has been identified in at least 8 independent occurrences in patients with a RASopathy (PS4; GeneDx, Partners LMM, Institute of Human Genetics, Otto von Guericke University Magdeburg internal data; GTR ID's: 26957, 21766, 506381 PMID:21784453; ClinVar SCV000061360.5; SCV000209017.10). The variant has also been reported to segregate with clinical features of a RASopathy in at least 3 family members (PP1; GeneDx, Zenker et al. internal data; ClinVar SCV000209017.9). Additionally, it has been reported in the literature in at least 2 unconfirmed de novo occurrences in patients with clinical features of a RASopathy (PM6_Strong; APHP-Robert Debré Hospital internal data; GTR ID's: 28338). At least 2 other pathogenic missense variants have been previously identified at this codon of RAF1 which may indicate that this residue is critical to the function of the protein (PM5_Strong; ClinVar 40603, 40602, 228288). In vitro functional studies also provide some evidence that the p.Ser259Thr variant may impact protein function (PS3_Supporting; PMID:21784453, 20052757). In summary, this variant meets the criteria to be classified as pathogenic for autosomal dominant RASopathy based on the ACMG/AMP criteria applied, as specified by the ClinGen RASopathy VCEP: PM5_Strong, PM6_Strong, PS4, PM1, PP1, PP2, PP3, PM2_Supporting, PS3_Supporting. (RASopathy VCEP specifications version 2.3; 12/3/2024) LINK:https://erepo.genome.network/evrepo/ui/classification/CA261617/MONDO:0021060/040

• Frequency: Genomes: not found (cov: 33)
• Consequence: RAF1 NM_002880.4 missense
• Clinical Significance: Pathogenic reviewed by expert panel P:9
• Conservation: PhyloP100: 9.32
• Publications: 62 publications found

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]

RAF1 Gene-Disease associations (from GenCC):

• Noonan syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• Noonan syndrome 5

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp, G2P
• dilated cardiomyopathy 1NN

  Inheritance: AD Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• LEOPARD syndrome 2

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Noonan syndrome with multiple lentigines

  Inheritance: AD Classification: SUPPORTIVE, LIMITED Submitted by: ClinGen, Orphanet
• cardiofaciocutaneous syndrome

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
• Costello syndrome

  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

Our verdict: Pathogenic. The variant received 19 ACMG points.

• PS3: For more information check the summary or visit ClinGen Evidence Repository.
• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM1: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PM5: For more information check the summary or visit ClinGen Evidence Repository.
• PM6: For more information check the summary or visit ClinGen Evidence Repository.
• PP1: For more information check the summary or visit ClinGen Evidence Repository.
• PP2: For more information check the summary or visit ClinGen Evidence Repository.
• PP3: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002880.4. 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
	RAF1	NM_002880.4	MANE Select	c.775T>A	p.Ser259Thr	missense	Exon 7 of 17	NP_002871.1	L7RRS6
	RAF1	NM_001354689.3		c.775T>A	p.Ser259Thr	missense	Exon 7 of 18	NP_001341618.1	A0A0S2Z559
	RAF1	NM_001354690.3		c.775T>A	p.Ser259Thr	missense	Exon 7 of 17	NP_001341619.1	P04049-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RAF1	ENST00000251849.9	TSL:1 MANE Select	c.775T>A	p.Ser259Thr	missense	Exon 7 of 17	ENSP00000251849.4	P04049-1
	RAF1	ENST00000442415.7	TSL:5	c.775T>A	p.Ser259Thr	missense	Exon 7 of 18	ENSP00000401888.2	P04049-2
	RAF1	ENST00000900382.1		c.775T>A	p.Ser259Thr	missense	Exon 7 of 18	ENSP00000570441.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
3	-	-	not provided (3)
2	-	-	Noonan syndrome (2)
2	-	-	RASopathy (2)
1	-	-	Monogenic short statue (1)
1	-	-	Noonan syndrome 1 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.92
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.26
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.60	D
Eigen	Pathogenic	0.76
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Uncertain	0.21	D
MetaRNN	Pathogenic	0.79	D
MetaSVM	Uncertain	0.38	D
MutationAssessor	Uncertain	2.9	M
PhyloP100		9.3
PrimateAI	Pathogenic	0.80	T
PROVEAN	Benign	-1.7	N
REVEL	Pathogenic	0.75
Sift	Uncertain	0.025	D
Sift4G	Benign	0.062	T
Polyphen		0.97	D
Vest4		0.60
MutPred		0.60		Gain of glycosylation at S257 (P = 0.0137)
MVP		0.92
MPC		1.2
ClinPred		0.95	D
GERP RS		5.7
PromoterAI		-0.0066	Neutral
Varity_R		0.29
gMVP		0.72
Mutation Taster		=14/86	disease causing (ClinVar)

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: rs3730271; hg19: chr3-12645694;