chr10-86900032-T-G

Variant names:

• chr10-86900032-T-G
• rs1554889007
• NM_004329.3:c.436T>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_004329.3(BMPR1A):​c.436T>G​(p.Phe146Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. 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. F146S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: BMPR1A NM_004329.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 1.42
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• generalized juvenile polyposis/juvenile polyposis coli

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, Genomics England PanelApp
• juvenile polyposis syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), G2P
• polyposis syndrome, hereditary mixed, 2

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• hereditary mixed polyposis syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• congenital heart defects, multiple types

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• pulmonary arterial hypertension

  Inheritance: Unknown Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 37 uncertain in NM_004329.3
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.121765375).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BMPR1A	NM_004329.3	c.436T>G	p.Phe146Val	missense_variant	Exon 7 of 13	ENST00000372037.8	NP_004320.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BMPR1A	ENST00000372037.8	c.436T>G	p.Phe146Val	missense_variant	Exon 7 of 13	1	NM_004329.3	ENSP00000361107.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Aug 30, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.F146V variant (also known as c.436T>G), located in coding exon 5 of the BMPR1A gene, results from a T to G substitution at nucleotide position 436. The phenylalanine at codon 146 is replaced by valine, an amino acid with highly similar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Juvenile polyposis syndrome Uncertain:1

Apr 05, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, this variant is a novel missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a BMPR1A-related disease. This sequence change replaces phenylalanine with valine at codon 146 of the BMPR1A protein (p.Phe146Val). The phenylalanine residue is weakly conserved and there is a small physicochemical difference between phenylalanine and valine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.067
BayesDel_addAF	Benign	0.0063	T
BayesDel_noAF	Benign	-0.23
CADD	Benign	17
DANN	Benign	0.88
DEOGEN2	Benign	0.13	T
Eigen	Benign	-0.60
Eigen_PC	Benign	-0.48
FATHMM_MKL	Uncertain	0.79	D
M_CAP	Benign	0.028	D
MetaRNN	Benign	0.12	T
MetaSVM	Benign	-0.76	T
MutationAssessor	Benign	0.55	N
PhyloP100		1.4
PrimateAI	Benign	0.45	T
PROVEAN	Benign	0.49	N
REVEL	Benign	0.18
Sift	Benign	0.65	T
Sift4G	Benign	0.52	T
Polyphen		0.0	B
Vest4		0.32
MutPred		0.50		Gain of relative solvent accessibility (P = 0.1571);
MVP		0.73
MPC		0.51
ClinPred		0.094	T
GERP RS		3.5
Varity_R		0.23
gMVP		0.48
Mutation Taster		=84/16	polymorphism

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

Other links and lift over

dbSNP: rs1554889007; hg19: chr10-88659789;