rs727504571

Positions:

chr7-140808049-T-C

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 1P and 4B. PP2BS2

This summary comes from the ClinGen Evidence Repository: The c.622A>G (p.Ile208Val) variant in BRAF is present in 0.00001% (2/128934) European alleles in gnomAD. The computational predictor REVEL gives a score of 0.318, which is neither above nor below the thresholds predicting a damaging or benign impact on BRAF function. This variant was observed in two healthy adult individuals who did not have clinical features of a RASopathy (SCV000205449.5; PMID:29945942). Additionally, 12 apparently unaffected parental samples were observed with this variant (BS2; SCV000329576.8, SCV001011557.1). The variant is located in the BRAF 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). In summary, this variant meets the criteria to be classified as likely benign for autosomal dominant RASopathy based on the ACMG/AMP criteria applied, as specified by the ClinGen RASopathy VCEP: BS2, PP2 (RASopathy VCEP specifications version 1; 8/11/22). LINK:https://erepo.genome.network/evrepo/ui/classification/CA183392/MONDO:0021060/004

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

BRAF
NM_004333.6 missense

Scores

Clinical Significance

Uncertain significance reviewed by expert panel U:2B:4

Conservation

PhyloP100: 8.02

Variant links:

Genes affected

BRAF (HGNC:1097): (B-Raf proto-oncogene, serine/threonine kinase) This gene encodes a protein belonging to the RAF family of serine/threonine protein kinases. This protein plays a role in regulating the MAP kinase/ERK signaling pathway, which affects cell division, differentiation, and secretion. Mutations in this gene, most commonly the V600E mutation, are the most frequently identified cancer-causing mutations in melanoma, and have been identified in various other cancers as well, including non-Hodgkin lymphoma, colorectal cancer, thyroid carcinoma, non-small cell lung carcinoma, hairy cell leukemia and adenocarcinoma of lung. Mutations in this gene are also associated with cardiofaciocutaneous, Noonan, and Costello syndromes, which exhibit overlapping phenotypes. A pseudogene of this gene has been identified on the X chromosome. [provided by RefSeq, Aug 2017]

BRAF links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PP2

For more information check the summary or visit ClinGen Evidence Repository.

BS2

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRAF	NM_001374258.1 linkuse as main transcript	c.622A>G	p.Ile208Val	missense_variant	5/20	ENST00000644969.2	NP_001361187.1
BRAF	NM_004333.6 linkuse as main transcript	c.622A>G	p.Ile208Val	missense_variant	5/18	ENST00000646891.2	NP_004324.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRAF	ENST00000644969.2 linkuse as main transcript	c.622A>G	p.Ile208Val	missense_variant	5/20		NM_001374258.1	ENSP00000496776
BRAF	ENST00000646891.2 linkuse as main transcript	c.622A>G	p.Ile208Val	missense_variant	5/18		NM_004333.6	ENSP00000493543	P4

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152078

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000119

AC:

AN:

251166

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135752

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000144

AC:

AN:

1460448

Hom.:

Cov.:

AF XY:

0.0000124

AC XY:

AN XY:

726608

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000171

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152078

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74280

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2Benign:4

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

RASopathy

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 01, 2022	- -
Uncertain significance, reviewed by expert panel	curation	ClinGen RASopathy Variant Curation Expert Panel	Mar 09, 2020	The c.622A>G (p.Ile208Val) variant in BRAF is present in 0.00001% (2/128934) European alleles in gnomAD. This variant was observed in two healthy adult individuals who did not have clinical features of a RASopathy (SCV000205449.5; PMID:29945942). Additionally, 12 apparently unaffected parental samples were observed with this variant, however this evidence does not meet current scoring criteria for BS2 at this time (BS2 not met; SCV000329576.8, SCV001011557.1). The variant is located in the BRAF 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). In summary, the clinical significance of the p.Ile208Val variant is uncertain at this time. RASopathy-specific ACMG/AMP criteria applied (PMID:29493581): PP2. -

not specified

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Sep 06, 2019	Variant summary: BRAF c.622A>G (p.Ile208Val) results in a conservative amino acid change located in the Raf-like Ras-binding domain (IPR003116) of the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 1.2e-05 in 251166 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.622A>G has been reported in the literature in unaffected individuals and index cases with clinical features inconsistent with a RASopathy in families undergoing evaluation for Noonan Syndrome and Related Conditions (Grant_2018). The variant was also identified in the paternal specimen following its initial identification in a prenatal specimen undergoing evaluation for Noonan syndrome and Related conditions at our laboratory. These report(s) do not provide unequivocal conclusions about association of the variant with Noonan Syndrome and Related Conditions. Co-occurrences with other pathogenic variant(s) have been reported in a melanoma cell line ( BRAF c.1799T>A, p.Val600Glu), providing supporting evidence for a benign role (Ikediobi_2016). To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as likely benign. Based on the evidence outlined above, the variant was classified as likely benign. -
Likely benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Jul 21, 2018	We observed the Ile208Val variant in BRAF in one individual with middle aortic s yndrome, low nasal bridge, hypertension, facial coarseness, short stature, learn ing disabilities/mental retardation, wide-spaced nipples and webbed neck and her reportedly unaffected parent, both tested by our laboratory. The variant was al so found in a fetus with increased nuchal translucency and her unaffected father (personal communication with the mother via our ClinVar entry). GeneDx observed the variant in three unrelated families undergoing exome testing in which the c linical presentations of individuals with the variant (n=6) were either normal o r had clinical features inconsistent with a RASopathy. This variant has also bee n found in the general population at a frequency of 3/276842 alleles (gnomAD, rs 727504571). Ile208Val has been reported in a melanoma cell line which also carri ed Val600Glu, a well-characterized activating mutation (Ikediobi 2006). Computat ional analyses (biochemical amino acid properties, conservation, AlignGVGD, Poly Phen2, and SIFT) do not provide strong support for or against an impact to the n ormal function of the protein. In summary, based upon the 3 observations in the general population and the 8 observations in individuals without a RASopathy dia gnosis, this variant is likely benign (Grant 2018). ACMG/AMP criteria applied: B S1_Supporting, BS2 -

Noonan syndrome and Noonan-related syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Nov 21, 2019

- -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Feb 05, 2019

This variant is associated with the following publications: (PMID: 29945942) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.092

BayesDel_addAF

Uncertain

0.033

BayesDel_noAF

Benign

-0.17

CADD

Uncertain

DANN

Uncertain

0.98

DEOGEN2

Benign

0.30

.;.;T;.

Eigen

Benign

0.12

Eigen_PC

Uncertain

0.30

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.89

D;D;D;D

M_CAP

Benign

0.017

MetaRNN

Benign

0.41

T;T;T;T

MetaSVM

Benign

-0.64

MutationAssessor

Benign

1.0

.;.;L;.

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.63

PROVEAN

Benign

0.040

.;.;.;N

REVEL

Uncertain

0.32

Sift

Benign

0.32

.;.;.;T

Sift4G

Benign

0.46

.;.;.;T

Polyphen

0.45

.;.;B;.

Vest4

0.36

MutPred

0.63

Loss of methylation at K206 (P = 0.0929);Loss of methylation at K206 (P = 0.0929);Loss of methylation at K206 (P = 0.0929);Loss of methylation at K206 (P = 0.0929);

MVP

0.72

MPC

1.1

ClinPred

0.45

GERP RS

5.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.30

gMVP

0.79

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over