X-153504706-G-A

Variant summary

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

The NM_001711.6(BGN):c.75G>A(p.Trp25Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. 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: 24)
• Consequence: BGN NM_001711.6 stop_gained
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 3.39

Genes affected

BGN (HGNC:1044): (biglycan) This gene encodes a member of the small leucine-rich proteoglycan (SLRP) family of proteins. The encoded preproprotein is proteolytically processed to generate the mature protein, which plays a role in bone growth, muscle development and regeneration, and collagen fibril assembly in multiple tissues. This protein may also regulate inflammation and innate immunity. Additionally, the encoded protein may contribute to atherosclerosis and aortic valve stenosis in human patients. This gene and the related gene decorin are thought to be the result of a gene duplication. [provided by RefSeq, Nov 2015]

ACMG classification

Verdict is Pathogenic. Variant got 14 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 8 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-153504706-G-A is Pathogenic according to our data. Variant chrX-153504706-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2501127.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BGN	NM_001711.6	c.75G>A	p.Trp25Ter	stop_gained	2/8	ENST00000331595.9
BGN	XM_017029724.3	c.75G>A	p.Trp25Ter	stop_gained	1/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BGN	ENST00000331595.9	c.75G>A	p.Trp25Ter	stop_gained	2/8	1	NM_001711.6	P1
BGN	ENST00000431891.1	c.75G>A	p.Trp25Ter	stop_gained	2/5	5
BGN	ENST00000472615.5	n.219G>A		non_coding_transcript_exon_variant	2/8	5
BGN	ENST00000480756.1	n.217G>A		non_coding_transcript_exon_variant	2/8	5

Frequencies

GnomAD3 genomes Cov.: 24

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 24

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Familial aortopathy Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Mar 23, 2023

Variant summary: BGN c.75G>A (p.Trp25X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. The variant was absent in 183289 control chromosomes (gnomAD). To our knowledge, no occurrence of c.75G>A in individuals affected with Aortopathy and no experimental evidence demonstrating its impact on protein function have been reported. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Meester-Loeys syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

research

Centre of Medical Genetics, University of Antwerp

Oct 20, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.71	D
BayesDel_noAF	Pathogenic	0.50
Cadd	Pathogenic	41
Dann	Uncertain	1.0
FATHMM_MKL	Benign	0.75	D
MutationTaster	Benign	1.0	A;D
Vest4		0.75
GERP RS		3.9

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

No publications associated with this variant yet.

Other links and lift over

hg19: chrX-152770164;