1-21873961-G-T

Position:

chr1-21873961-G-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 1P and 13B. PP2BP4_StrongBP6BS1BS2

The NM_005529.7(HSPG2):c.3707C>A(p.Ala1236Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00268 in 1,605,542 control chromosomes in the GnomAD database, including 10 homozygotes. 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A1236V) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0018 ( 1 hom., cov: 32)

Exomes 𝑓: 0.0028 ( 9 hom. )

Consequence

HSPG2
NM_005529.7 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:11

Conservation

PhyloP100: 2.53

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 -12 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=0.023008376).

BP6

Variant 1-21873961-G-T is Benign according to our data. Variant chr1-21873961-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 447549.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=6, Benign=2, Uncertain_significance=1}. Variant chr1-21873961-G-T is described in Lovd as [Likely_benign]. Variant chr1-21873961-G-T is described in Lovd as [Pathogenic].

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00183 (279/152286) while in subpopulation NFE AF= 0.0036 (245/68002). AF 95% confidence interval is 0.00323. There are 1 homozygotes in gnomad4. There are 108 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAdExome4 at 9 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HSPG2	NM_005529.7 linkuse as main transcript	c.3707C>A	p.Ala1236Glu	missense_variant	29/97	ENST00000374695.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HSPG2	ENST00000374695.8 linkuse as main transcript	c.3707C>A	p.Ala1236Glu	missense_variant	29/97	1	NM_005529.7	P1
HSPG2	ENST00000427897.1 linkuse as main transcript	c.272C>A	p.Ala91Glu	missense_variant	3/5	5

Frequencies

GnomAD3 genomes

AF:

0.00184

AC:

280

AN:

152168

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000579

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.000188

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00362

Gnomad OTH

AF:

0.000956

GnomAD3 exomes

AF:

0.00163

AC:

383

AN:

235252

Hom.:

AF XY:

0.00173

AC XY:

220

AN XY:

127012

show subpopulations

Gnomad AFR exome

AF:

0.000475

Gnomad AMR exome

AF:

0.000451

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00190

Gnomad FIN exome

AF:

0.000255

Gnomad NFE exome

AF:

0.00279

Gnomad OTH exome

AF:

0.00103

GnomAD4 exome

AF:

0.00276

AC:

4018

AN:

1453256

Hom.:

Cov.:

AF XY:

0.00272

AC XY:

1962

AN XY:

721772

show subpopulations

Gnomad4 AFR exome

AF:

0.000389

Gnomad4 AMR exome

AF:

0.000411

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000253

Gnomad4 SAS exome

AF:

0.00151

Gnomad4 FIN exome

AF:

0.000322

Gnomad4 NFE exome

AF:

0.00337

Gnomad4 OTH exome

AF:

0.00178

GnomAD4 genome

AF:

0.00183

AC:

279

AN:

152286

Hom.:

Cov.:

AF XY:

0.00145

AC XY:

108

AN XY:

74462

show subpopulations

Gnomad4 AFR

AF:

0.000577

Gnomad4 AMR

AF:

0.000261

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000414

Gnomad4 FIN

AF:

0.000188

Gnomad4 NFE

AF:

0.00360

Gnomad4 OTH

AF:

0.000946

Alfa

AF:

0.00266

Hom.:

Bravo

AF:

0.00171

TwinsUK

AF:

0.00297

AC:

ALSPAC

AF:

0.00259

AC:

ESP6500AA

AF:

0.000908

AC:

ESP6500EA

AF:

0.00244

AC:

ExAC

AF:

0.00148

AC:

180

Asia WGS

AF:

0.000866

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:11

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:7

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Apr 01, 2024	HSPG2: BP4, BS2 -
Likely benign, criteria provided, single submitter	clinical testing	Invitae	Jan 11, 2024	- -
Likely benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -
Likely benign, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Jun 28, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Jun 28, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Nov 28, 2016	- -

Lethal Kniest-like syndrome

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

HSPG2-related disorder

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Jun 14, 2022

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). -

Schwartz-Jampel syndrome

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

Connective tissue disorder

Benign:1

Benign, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Dec 20, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.20

BayesDel_addAF

Benign

-0.36

BayesDel_noAF

Benign

-0.29

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.093

Eigen

Benign

0.0051

Eigen_PC

Benign

0.039

FATHMM_MKL

Benign

0.53

LIST_S2

Uncertain

0.89

M_CAP

Benign

0.031

MetaRNN

Benign

0.023

MetaSVM

Benign

-0.98

MutationAssessor

Benign

1.1

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.49

PROVEAN

Benign

-1.4

REVEL

Benign

0.15

Sift

Uncertain

0.023

Sift4G

Uncertain

0.0070

Polyphen

0.77

Vest4

0.35

MVP

0.67

MPC

0.57

ClinPred

0.026

GERP RS

5.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.2

Varity_R

0.29

gMVP

0.21

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