rs1554886816

Positions:

• chr10-86876059-ATTTG-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_004329.3(BMPR1A):​c.44_47del​(p.Leu15SerfsTer20) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: BMPR1A NM_004329.3 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 3.56

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]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 32 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 10-86876059-ATTTG-A is Pathogenic according to our data. Variant chr10-86876059-ATTTG-A is described in ClinVar as [Pathogenic]. Clinvar id is 529908.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.44_47del	p.Leu15SerfsTer20	frameshift_variant	3/13	ENST00000372037.8	NP_004320.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BMPR1A	ENST00000372037.8	c.44_47del	p.Leu15SerfsTer20	frameshift_variant	3/13	1	NM_004329.3	ENSP00000361107	P1

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: Pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Juvenile polyposis syndrome Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 23, 2020	For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in BMPR1A are known to be pathogenic (PMID: 11536076, 12417513). This variant has been reported in individuals affected with juvenile polyposis and colon cancer (PMID: 11381269) and has been reported to segregate with juvenile polyposis syndrome (JPS) in a single family (PMID: 23399955). This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Leu15Serfs*20) in the BMPR1A gene. It is expected to result in an absent or disrupted protein product. -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jun 01, 2001	- -

Generalized juvenile polyposis/juvenile polyposis coli Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Centogene AG - the Rare Disease Company

-

- -

Hereditary cancer-predisposing syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 31, 2018

The c.44_47delTGTT pathogenic mutation, located in coding exon 1 of the BMPR1A gene, results from a deletion of 4 nucleotides at nucleotide positions 44 to 47, causing a translational frameshift with a predicted alternate stop codon (p.L15Sfs*20). This alteration segregated with disease in 8 members of a juvenile polyposis family and was not seen in four unaffected family members (Howe JR et al. Nat. Genet., 2001 Jun;28:184-7). It was also seen in two patients with juvenile polyps who also had colon cancer ( (Ngeow J et al. Gastroenterology, 2013 Jun;144:1402-9, 1409.e1-5). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

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: rs1554886816; hg19: chr10-88635816;