1-39492167-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_181809.4(BMP8A):c.176G>A(p.Arg59Gln) variant causes a missense change. The variant allele was found at a frequency of 0.0000121 in 1,158,874 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: BMP8A NM_181809.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.24

Genes affected

BMP8A (HGNC:21650): (bone morphogenetic protein 8a) 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. This protein may play a role in development of the reproductive system. This gene may have arose from a gene duplication event and its gene duplicate is also present on chromosome 1. [provided by RefSeq, Jul 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BMP8A	NM_181809.4	c.176G>A	p.Arg59Gln	missense_variant	1/7	ENST00000331593.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BMP8A	ENST00000331593.6	c.176G>A	p.Arg59Gln	missense_variant	1/7	1	NM_181809.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.0000121 AC: 14 AN: 1158874 Hom.: 0 Cov.: 28 AF XY: 0.00000887 AC XY: 5 AN XY: 563668

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000119

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000113

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 18, 2021

The c.176G>A (p.R59Q) alteration is located in exon 1 (coding exon 1) of the BMP8A gene. This alteration results from a G to A substitution at nucleotide position 176, causing the arginine (R) at amino acid position 59 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.0037	T
BayesDel_noAF	Benign	-0.24
Cadd	Pathogenic	27
Dann	Uncertain	1.0
DEOGEN2	Benign	0.33	T
Eigen	Uncertain	0.28
Eigen_PC	Benign	0.11
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Uncertain	0.96	D
M_CAP	Pathogenic	0.73	D
MetaRNN	Uncertain	0.61	D
MetaSVM	Uncertain	-0.21	T
MutationAssessor	Pathogenic	3.1	M
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.89	D
PROVEAN	Uncertain	-2.9	D
REVEL	Uncertain	0.33
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.0080	D
Polyphen		1.0	D
Vest4		0.11
MutPred		0.48		Loss of methylation at R59 (P = 0.0223);
MVP		0.74
MPC		3.0
ClinPred		0.99	D
GERP RS		2.4
Varity_R		0.46
gMVP		0.55

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: rs1303883284; hg19: chr1-39957839;