2-202467519-G-T

Variant names:

• chr2-202467519-G-T
• rs1085307195
• NM_001204.7:c.248G>T

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM1 PM2 PM5 PP3_Moderate

The NM_001204.7(BMPR2):​c.248G>T​(p.Gly83Val) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 15/24 in silico tools predict a damaging outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G83E) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: BMPR2 NM_001204.7 missense, splice_region
• Scores: Splicing: ADA: 0.9999
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.26
• Publications: 0 publications found

Genes affected

BMPR2 (HGNC:1078): (bone morphogenetic protein receptor type 2) This gene encodes a member of the bone morphogenetic protein (BMP) receptor family of transmembrane serine/threonine kinases. The ligands of this receptor are members of the TGF-beta superfamily. BMPs are involved in endochondral bone formation and embryogenesis. These proteins transduce their signals through the formation of heteromeric complexes of two different types of serine (threonine) kinase receptors: type I receptors of about 50-55 kD and type II receptors of about 70-80 kD. Mutations in this gene have been associated with primary pulmonary hypertension, both familial and fenfluramine-associated, and with pulmonary venoocclusive disease. [provided by RefSeq, May 2020]

BMPR2 Gene-Disease associations (from GenCC):

• pulmonary arterial hypertension

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• pulmonary hypertension, primary, 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae)
• heritable pulmonary arterial hypertension

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• congenital heart disease

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM1: In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 9 uncertain in NM_001204.7
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-202467519-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 425741.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BMPR2	NM_001204.7	c.248G>T	p.Gly83Val	missense_variant, splice_region_variant	Exon 3 of 13	ENST00000374580.10	NP_001195.2
BMPR2	XM_011511687.2	c.248G>T	p.Gly83Val	missense_variant, splice_region_variant	Exon 3 of 13		XP_011509989.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BMPR2	ENST00000374580.10	c.248G>T	p.Gly83Val	missense_variant, splice_region_variant	Exon 3 of 13	1	NM_001204.7	ENSP00000363708.4
BMPR2	ENST00000374574.2	c.248G>T	p.Gly83Val	missense_variant, splice_region_variant	Exon 3 of 12	2		ENSP00000363702.2
BMPR2	ENST00000479069.1	n.155G>T		splice_region_variant, non_coding_transcript_exon_variant	Exon 2 of 3	3

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

Primary pulmonary hypertension Uncertain:1

Jan 04, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 83 of the BMPR2 protein (p.Gly83Val). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of pulmonary hypertension (Invitae). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. This variant disrupts the p.Gly83 amino acid residue in BMPR2. Other variant(s) that disrupt this residue have been observed in individuals with BMPR2-related conditions (PMID: 18356561), which suggests that this may be a clinically significant amino acid residue. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	35
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.99	D;.
Eigen	Pathogenic	0.91
Eigen_PC	Pathogenic	0.85
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.96	D;D
M_CAP	Pathogenic	0.65	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	2.9	M;M
PhyloP100		8.3
PrimateAI	Pathogenic	0.85	D
PROVEAN	Pathogenic	-7.8	D;D
REVEL	Pathogenic	0.97
Sift	Benign	0.030	D;D
Sift4G	Uncertain	0.0030	D;D
Polyphen		1.0	D;.
Vest4		0.98
MutPred		0.94		Loss of sheet (P = 0.0315);Loss of sheet (P = 0.0315);
MVP		0.97
MPC		1.2
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.99
gMVP		0.93
Mutation Taster		=3/97	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	1.0
SpliceAI score (max)		0.080		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: rs1085307195; hg19: chr2-203332242;