chr20-6778358-C-T

Position:

• chr20-6778358-C-T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1_Strong PM2 PP5_Very_Strong

The NM_001200.4(BMP2):​c.460C>T​(p.Arg154Ter) variant causes a stop gained 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 Likely pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: BMP2 NM_001200.4 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7 U:1
• Conservation: PhyloP100: 4.07

Genes affected

BMP2 (HGNC:1069): (bone morphogenetic protein 2) This gene encodes a secreted ligand of the TGF-beta (transforming growth factor-beta) superfamily of proteins. Ligands of this family bind various TGF-beta receptors leading to recruitment and activation of SMAD family transcription factors that regulate gene expression. The encoded preproprotein is proteolytically processed to generate each subunit of the disulfide-linked homodimer, which plays a role in bone and cartilage development. Duplication of a regulatory region downstream of this gene causes a form of brachydactyly characterized by a malformed index finger and second toe in human patients. [provided by RefSeq, Jul 2016]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.614 CDS is truncated, and there are 3 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 20-6778358-C-T is Pathogenic according to our data. Variant chr20-6778358-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 388927.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr20-6778358-C-T is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BMP2	NM_001200.4	c.460C>T	p.Arg154Ter	stop_gained	3/3	ENST00000378827.5	NP_001191.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BMP2	ENST00000378827.5	c.460C>T	p.Arg154Ter	stop_gained	3/3	1	NM_001200.4	ENSP00000368104	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7 Uncertain:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:5 Uncertain:1

Likely pathogenic, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Blueprint Genetics	Nov 30, 2019	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Mar 10, 2021	This sequence change creates a premature translational stop signal (p.Arg154*) in the BMP2 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 243 amino acid(s) of the BMP2 protein. This variant is not present in population databases (ExAC no frequency). For these reasons, this variant has been classified as Pathogenic. This variant disrupts the C-terminus of the BMP2 protein. Other variant(s) that disrupt this region (p.Cys329*) have been determined to be pathogenic (PMID: 29198724). This suggests that variants that disrupt this region of the protein are likely to be causative of disease. This variant has been observed in individual(s) with clinical features of BMP2-related conditions (PMID: 29198724). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 388927). -
Uncertain significance, flagged submission	clinical testing	GeneDx	Sep 06, 2016	The R154X variant in the BMP2 gene has not been reported previously as a pathogenic variant nor as a benign variant, to our knowledge. This variant is predicted to cause loss of normal protein function through protein truncation with loss of the last 243 amino acid residues. The R154X variant was not observed in approximately 6500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. We interpret R154X as a variant of uncertain significance -
Likely pathogenic, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Likely pathogenic, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -

Short stature, facial dysmorphism, and skeletal anomalies with or without cardiac anomalies Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Institute of Human Genetics, University of Leipzig Medical Center	Dec 17, 2021	_x000D_Maternally inherited, mother similarly affected Criteria applied: PVS1, PS4_MOD, PS2_SUP, PM2_SUP -
Likely pathogenic, criteria provided, single submitter	curation	SIB Swiss Institute of Bioinformatics	Oct 15, 2018	This variant is interpreted as Likely Pathogenic, for Short stature, facial dysmorphism, and skeletal anomalies with or without cardiac anomalies, autosomal dominant. The following ACMG Tag(s) were applied: PM2 => Absent from controls (or at extremely low frequency if recessive) in Exome Sequencing Project, 1000 Genomes Project, or Exome Aggregation Consortium. PVS1-Strong => PVS1 downgraded in strength to Strong (https://www.ncbi.nlm.nih.gov/pubmed/29198724). PM6 => Assumed de novo, but without confirmation of paternity and maternity (https://www.ncbi.nlm.nih.gov/pubmed/29198724). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.55	D
BayesDel_noAF	Pathogenic	0.56
CADD	Pathogenic	39
DANN	Uncertain	1.0
Eigen	Pathogenic	0.93
Eigen_PC	Pathogenic	0.83
FATHMM_MKL	Uncertain	0.90	D
MutationTaster	Benign	1.0	D
Vest4		0.86
GERP RS		5.9

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

Other links and lift over

dbSNP: rs1057523275; hg19: chr20-6759005;