7-140801517-C-G

Position:

• chr7-140801517-C-G

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP2 PP3_Moderate PP5

The NM_004333.6(BRAF):​c.755G>C​(p.Arg252Pro) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: BRAF NM_004333.6 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2 U:1
• Conservation: PhyloP100: 4.09

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 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a zinc_finger_region Phorbol-ester/DAG-type (size 46) in uniprot entity BRAF_HUMAN there are 7 pathogenic changes around while only 1 benign (88%) in NM_004333.6
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), BRAF. . Gene score misZ 3.7208 (greater than the threshold 3.09). Trascript score misZ 4.9447 (greater than threshold 3.09). GenCC has associacion of gene with LEOPARD syndrome 3, anaplastic astrocytoma, Noonan syndrome with multiple lentigines, cardiofaciocutaneous syndrome 1, Noonan syndrome, cardiofaciocutaneous syndrome, Costello syndrome, Noonan syndrome 7.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.88
• PP5: Variant 7-140801517-C-G is Pathogenic according to our data. Variant chr7-140801517-C-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 451504.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Pathogenic=1, Likely_pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRAF	NM_001374258.1	c.755G>C	p.Arg252Pro	missense_variant	6/20	ENST00000644969.2	NP_001361187.1
BRAF	NM_004333.6	c.755G>C	p.Arg252Pro	missense_variant	6/18	ENST00000646891.2	NP_004324.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BRAF	ENST00000644969.2	c.755G>C	p.Arg252Pro	missense_variant	6/20		NM_001374258.1	ENSP00000496776.1
BRAF	ENST00000646891.2	c.755G>C	p.Arg252Pro	missense_variant	6/18		NM_004333.6	ENSP00000493543.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Global developmental delay Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Jan 01, 2017

- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

May 05, 2023

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 has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 31623504, 32005694, 28650561, 15488754, 15520807, 16439621, 17603483, 24957944, 29493581) -

Noonan syndrome and Noonan-related syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Jul 25, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.28	D
BayesDel_noAF	Pathogenic	0.17
CADD	Pathogenic	34
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.89	.;.;D;.
Eigen	Pathogenic	0.77
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.96	D;D;D;D
M_CAP	Uncertain	0.25	D
MetaRNN	Pathogenic	0.88	D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Uncertain	2.7	.;.;M;.
PrimateAI	Pathogenic	0.91	D
PROVEAN	Uncertain	-3.1	.;.;.;D
REVEL	Pathogenic	0.78
Sift	Uncertain	0.0060	.;.;.;D
Sift4G	Uncertain	0.011	.;.;.;D
Polyphen		1.0	.;.;D;.
Vest4		0.87
MutPred		0.69		Loss of MoRF binding (P = 0.0387);Loss of MoRF binding (P = 0.0387);Loss of MoRF binding (P = 0.0387);Loss of MoRF binding (P = 0.0387);
MVP		0.86
MPC		2.4
ClinPred		0.99	D
GERP RS		5.4
Varity_R		0.94
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.41		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.41		Position offset: -5

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1325951163; hg19: chr7-140501317;