1-21880534-C-T

Position:

chr1-21880534-C-T

Variant summary

Our verdict is Benign. Variant got -15 ACMG points: 1P and 16B. PP2BP4_StrongBP6_Very_StrongBS1

The NM_005529.7(HSPG2):c.2024G>A(p.Arg675Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000326 in 1,613,602 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R675W) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0016 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00019 ( 0 hom. )

Consequence

HSPG2
NM_005529.7 missense

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: -0.184

Variant links:

Genes affected

HSPG2 (HGNC:5273): (heparan sulfate proteoglycan 2) This gene encodes the perlecan protein, which consists of a core protein to which three long chains of glycosaminoglycans (heparan sulfate or chondroitin sulfate) are attached. The perlecan protein is a large multidomain proteoglycan that binds to and cross-links many extracellular matrix components and cell-surface molecules. It has been shown that this protein interacts with laminin, prolargin, collagen type IV, FGFBP1, FBLN2, FGF7 and transthyretin, etc., and it plays essential roles in multiple biological activities. Perlecan is a key component of the vascular extracellular matrix, where it helps to maintain the endothelial barrier function. It is a potent inhibitor of smooth muscle cell proliferation and is thus thought to help maintain vascular homeostasis. It can also promote growth factor (e.g., FGF2) activity and thus stimulate endothelial growth and re-generation. It is a major component of basement membranes, where it is involved in the stabilization of other molecules as well as being involved with glomerular permeability to macromolecules and cell adhesion. Mutations in this gene cause Schwartz-Jampel syndrome type 1, Silverman-Handmaker type of dyssegmental dysplasia, and tardive dyskinesia. Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, May 2014]

HSPG2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -15 ACMG points.

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), HSPG2. . Gene score misZ 1.1367 (greater than the threshold 3.09). Trascript score misZ 3.3999 (greater than threshold 3.09). GenCC has associacion of gene with Silverman-Handmaker type dyssegmental dysplasia, Schwartz-Jampel syndrome type 1, Schwartz-Jampel syndrome.

BP4

Computational evidence support a benign effect (MetaRNN=0.0067813993).

BP6

Variant 1-21880534-C-T is Benign according to our data. Variant chr1-21880534-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 585985.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00161 (246/152352) while in subpopulation AFR AF= 0.00558 (232/41574). AF 95% confidence interval is 0.00499. There are 0 homozygotes in gnomad4. There are 121 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HSPG2	NM_005529.7 linkuse as main transcript	c.2024G>A	p.Arg675Gln	missense_variant	16/97	ENST00000374695.8	NP_005520.4	P98160

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HSPG2	ENST00000374695.8 linkuse as main transcript	c.2024G>A	p.Arg675Gln	missense_variant	16/97	1	NM_005529.7	ENSP00000363827.3		P98160

Frequencies

GnomAD3 genomes

AF:

0.00161

AC:

245

AN:

152234

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00557

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000785

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000390

AC:

AN:

248632

Hom.:

AF XY:

0.000260

AC XY:

AN XY:

134812

show subpopulations

Gnomad AFR exome

AF:

0.00531

Gnomad AMR exome

AF:

0.000174

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000267

Gnomad OTH exome

AF:

0.000493

GnomAD4 exome

AF:

0.000192

AC:

280

AN:

1461250

Hom.:

Cov.:

AF XY:

0.000153

AC XY:

111

AN XY:

726906

show subpopulations

Gnomad4 AFR exome

AF:

0.00675

Gnomad4 AMR exome

AF:

0.000269

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000153

Gnomad4 OTH exome

AF:

0.000364

GnomAD4 genome

AF:

0.00161

AC:

246

AN:

152352

Hom.:

Cov.:

AF XY:

0.00162

AC XY:

121

AN XY:

74494

show subpopulations

Gnomad4 AFR

AF:

0.00558

Gnomad4 AMR

AF:

0.000784

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000297

Hom.:

Bravo

AF:

0.00198

ESP6500AA

AF:

0.00568

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000437

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000109

EpiControl

AF:

0.0000593

ClinVar

Significance: Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:4

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	May 01, 2023	HSPG2: BP4 -
Likely benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Feb 01, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 19, 2024	- -
Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Inborn genetic diseases

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 11, 2021

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

HSPG2-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

May 11, 2020

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.058

BayesDel_addAF

Benign

-0.61

BayesDel_noAF

Benign

-0.64

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.26

Eigen

Benign

-0.61

Eigen_PC

Benign

-0.54

FATHMM_MKL

Benign

0.31

LIST_S2

Benign

0.76

M_CAP

Benign

0.027

MetaRNN

Benign

0.0068

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.32

PrimateAI

Benign

0.25

PROVEAN

Benign

-2.2

REVEL

Benign

0.063

Sift

Benign

0.30

Sift4G

Uncertain

0.012

Polyphen

0.0080

Vest4

0.17

MVP

0.27

MPC

0.25

ClinPred

0.012

GERP RS

0.20

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.092

gMVP

0.34

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over