7-140753333-TTCA-T

Variant names:

• chr7-140753333-TTCA-T
• rs397516897
• NM_001374258.1:c.1919_1921delTGA

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM1 PM2 PM4_Supporting PP5_Moderate

The NM_001374258.1(BRAF):​c.1919_1921delTGA​(p.Val640_Lys641delinsGlu) variant causes a disruptive inframe deletion change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. V640V) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: BRAF NM_001374258.1 disruptive_inframe_deletion
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 9.24
• Publications: 17 publications found

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 Gene-Disease associations (from GenCC):

• cardiofaciocutaneous syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• cardiofaciocutaneous syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), PanelApp Australia, Ambry Genetics, G2P, Genomics England PanelApp
• LEOPARD syndrome 3

  Inheritance: AD Classification: DEFINITIVE, STRONG, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp
• Noonan syndrome 7

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), PanelApp Australia, G2P, Ambry Genetics, Genomics England PanelApp
• Noonan syndrome

  Inheritance: AD Classification: MODERATE Submitted by: ClinGen
• Noonan syndrome with multiple lentigines

  Inheritance: AD Classification: SUPPORTIVE, LIMITED Submitted by: ClinGen, Orphanet
• anaplastic astrocytoma

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• Costello syndrome

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PM1: In a hotspot region, there are 19 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 5 uncertain in NM_001374258.1
• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_001374258.1. Strenght limited to Supporting due to length of the change: 1aa.
• PP5: Variant 7-140753333-TTCA-T is Pathogenic according to our data. Variant chr7-140753333-TTCA-T is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 44817.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BRAF	NM_001374258.1	c.1919_1921delTGA	p.Val640_Lys641delinsGlu	disruptive_inframe_deletion	Exon 16 of 20	ENST00000644969.2	NP_001361187.1
BRAF	NM_004333.6	c.1799_1801delTGA	p.Val600_Lys601delinsGlu	disruptive_inframe_deletion	Exon 15 of 18	ENST00000646891.2	NP_004324.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BRAF	ENST00000644969.2	c.1919_1921delTGA	p.Val640_Lys641delinsGlu	disruptive_inframe_deletion	Exon 16 of 20		NM_001374258.1	ENSP00000496776.1
BRAF	ENST00000646891.2	c.1799_1801delTGA	p.Val600_Lys601delinsGlu	disruptive_inframe_deletion	Exon 15 of 18		NM_004333.6	ENSP00000493543.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Non-small cell lung carcinoma Pathogenic:1

Oct 12, 2011

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Positive. The Val600_Lys601delinsGlu variant has not been previously reported i n lung tumors, but has been reported as a confirmed somatic variant in papillary thyroid carcinomas (COSMIC). Somatic BRAF variants have been identified in up t o 3% of cases of lung adenocarcinoma (Davies 2002). -

not provided Uncertain:1

-

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		9.2
Mutation Taster		=20/180	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs397516897; hg19: chr7-140453133; COSMIC: COSV56060025;