7-140808018-G-C

Position:

• chr7-140808018-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_004333.6(BRAF):​c.653C>G​(p.Thr218Ser) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: BRAF NM_004333.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.89

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• 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.
• BP4: Computational evidence support a benign effect (MetaRNN=0.3463982).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BRAF	NM_001374258.1	c.653C>G	p.Thr218Ser	missense_variant	5/20	ENST00000644969.2	NP_001361187.1
BRAF	NM_004333.6	c.653C>G	p.Thr218Ser	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	c.653C>G	p.Thr218Ser	missense_variant	5/20		NM_001374258.1	ENSP00000496776
BRAF	ENST00000646891.2	c.653C>G	p.Thr218Ser	missense_variant	5/18		NM_004333.6	ENSP00000493543	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Dec 23, 2016

The p.Thr218Ser variant in BRAF has not been previously reported in individuals with clinical features of a RASopathy and was absent from large population studi es. Computational prediction tools and conservation analysis do not provide stro ng support for or against an impact to the protein. In summary, the clinical sig nificance of the p.Thr218Ser variant is uncertain. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.43
BayesDel_addAF	Uncertain	0.027	T
BayesDel_noAF	Benign	-0.20
CADD	Uncertain	25
DANN	Uncertain	0.98
DEOGEN2	Benign	0.31	.;.;T;.
Eigen	Benign	0.071
Eigen_PC	Benign	0.21
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.93	D;D;D;D
M_CAP	Benign	0.012	T
MetaRNN	Benign	0.35	T;T;T;T
MetaSVM	Benign	-0.82	T
MutationAssessor	Benign	0.69	.;.;N;.
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.82	D
PROVEAN	Benign	-0.34	.;.;.;N
REVEL	Uncertain	0.34
Sift	Benign	0.85	.;.;.;T
Sift4G	Benign	0.73	.;.;.;T
Polyphen		0.81	.;.;P;.
Vest4		0.38
MutPred		0.40		Gain of disorder (P = 0.0636);Gain of disorder (P = 0.0636);Gain of disorder (P = 0.0636);Gain of disorder (P = 0.0636);
MVP		0.72
MPC		1.1
ClinPred		0.74	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.40
gMVP		0.78

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs1554404461; hg19: chr7-140507818;