10-86923600-C-T

Position:

• chr10-86923600-C-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1_Moderate PM2 PP5_Very_Strong

The NM_004329.3(BMPR1A):​c.1480C>T​(p.Arg494*) 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)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: BMPR1A NM_004329.3 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 4.01

Genes affected

BMPR1A (HGNC:1076): (bone morphogenetic protein receptor type 1A) The bone morphogenetic protein (BMP) receptors are a family of transmembrane serine/threonine kinases that include the type I receptors BMPR1A and BMPR1B and the type II receptor BMPR2. These receptors are also closely related to the activin receptors, ACVR1 and ACVR2. The ligands of these receptors are members of the TGF-beta superfamily. TGF-betas and activins transduce their signals through the formation of heteromeric complexes with 2 different types of serine (threonine) kinase receptors: type I receptors of about 50-55 kD and type II receptors of about 70-80 kD. Type II receptors bind ligands in the absence of type I receptors, but they require their respective type I receptors for signaling, whereas type I receptors require their respective type II receptors for ligand binding. [provided by RefSeq, Jul 2008]

BMPR1A (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 12 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 0.0744 CDS is truncated, and there are 0 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 10-86923600-C-T is Pathogenic according to our data. Variant chr10-86923600-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 183720.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BMPR1A	NM_004329.3	c.1480C>T	p.Arg494*	stop_gained	13/13	ENST00000372037.8	NP_004320.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BMPR1A	ENST00000372037.8	c.1480C>T	p.Arg494*	stop_gained	13/13	1	NM_004329.3	ENSP00000361107.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 6.84e-7 AC: 1 AN: 1461886 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727242

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary cancer-predisposing syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	May 26, 2020	This variant changes 1 nucleotide in exon 13 of the BMPR1A gene, creating a premature translation stop signal in the last coding exon. This variant causes the deletion of the last 39 amino acids from the BMPR1A protein, including the C-terminal portion of the kinase domain (PMID: 8397373). To our knowledge, functional studies have not been reported for this variant. This variant has been observed in two individuals affected with juvenile polyposis (PMID: 23399955). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). Loss of BMPR1A function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Dec 16, 2019	The p.R494* pathogenic mutation (also known as c.1480C>T), located in coding exon 11 of the BMPR1A gene, results from a C to T substitution at nucleotide position 1480. This changes the amino acid from an arginine to a stop codon within coding exon 11. This mutation has been identified in individuals with a history of juvenile and hamartomatous colon polyps (Ngeow J et al. Gastroenterology 2013 Jun;144:1402-9; Ambry internal data). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation. As such, this alteration is interpreted as a disease-causing mutation. -

Juvenile polyposis syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	May 30, 2023	This variant is considered pathogenic. This variant creates a termination codon and is predicted to result in premature protein truncation. -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 17, 2021	This premature translational stop signal has been observed in individual(s) with juvenile polyposis (PMID: 23399955). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Arg494*) in the BMPR1A gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 39 amino acid(s) of the BMPR1A protein. ClinVar contains an entry for this variant (Variation ID: 183720). For these reasons, this variant has been classified as Pathogenic. This variant disrupts a region of the BMPR1A protein in which other variant(s) (p.Trp504*) have been determined to be pathogenic (Invitae). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. -

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Jun 18, 2019

Not observed in large population cohorts (Lek et al., 2016); Nonsense variant predicted to result in protein truncation, although loss-of-function variants have not been reported downstream of this position in the protein; This variant is associated with the following publications: (PMID: 23399955, 27119594) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.57
CADD	Pathogenic	41
DANN	Uncertain	1.0
Eigen	Pathogenic	0.73
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Pathogenic	0.98	D
Vest4		0.81
GERP RS		3.9

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.13		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: rs786201040; hg19: chr10-88683357; COSMIC: COSV64404915;