1-21896225-T-A

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS1

The NM_005529.7(HSPG2):c.149A>T(p.His50Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000166 in 1,613,822 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00098 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000081 ( 0 hom. )

Consequence

HSPG2
NM_005529.7 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:3

Conservation

PhyloP100: 1.18

Publications

2 publications found

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 Gene-Disease associations (from GenCC):

Schwartz-Jampel syndrome type 1
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), G2P
Silverman-Handmaker type dyssegmental dysplasia
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, ClinGen, Labcorp Genetics (formerly Invitae)
Schwartz-Jampel syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

HSPG2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.009218067).

BP6

Variant 1-21896225-T-A is Benign according to our data. Variant chr1-21896225-T-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 373152.We mark this variant Likely_benign, oryginal submission is: [Conflicting_classifications_of_pathogenicity].

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000981 (149/151954) while in subpopulation AFR AF = 0.00345 (143/41428). AF 95% confidence interval is 0.00299. There are 0 homozygotes in GnomAd4. There are 71 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HSPG2	NM_005529.7 link	c.149A>T	p.His50Leu	missense_variant	Exon 2 of 97	ENST00000374695.8	NP_005520.4	P98160

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
HSPG2	ENST00000374695.8 link	c.149A>T	p.His50Leu	missense_variant	Exon 2 of 97	1	NM_005529.7	ENSP00000363827.3	P98160
HSPG2	ENST00000412328.5 link	n.86A>T		non_coding_transcript_exon_variant	Exon 1 of 6	2
HSPG2	ENST00000439717.2 link	n.47A>T		non_coding_transcript_exon_variant	Exon 1 of 5	2

Frequencies

GnomAD3 genomes

AF:

0.000981

AC:

149

AN:

151836

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00346

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.000957

GnomAD2 exomes

AF:

0.000227

AC:

AN:

251468

AF XY:

0.000177

show subpopulations

Gnomad AFR exome

AF:

0.00314

Gnomad AMR exome

AF:

0.000116

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000814

AC:

119

AN:

1461868

Hom.:

Cov.:

AF XY:

0.0000633

AC XY:

AN XY:

727240

show subpopulations

African (AFR)

AF:

0.00311

AC:

104

AN:

33480

American (AMR)

AF:

0.0000894

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53404

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1112002

Other (OTH)

AF:

0.000149

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.480

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.000981

AC:

149

AN:

151954

Hom.:

Cov.:

AF XY:

0.000956

AC XY:

AN XY:

74244

show subpopulations

African (AFR)

AF:

0.00345

AC:

143

AN:

41428

American (AMR)

AF:

0.000131

AC:

AN:

15262

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3464

East Asian (EAS)

AF:

0.00

AC:

AN:

5140

South Asian (SAS)

AF:

0.00

AC:

AN:

4814

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10542

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

67986

Other (OTH)

AF:

0.000947

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.494

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.000113

Hom.:

Bravo

AF:

0.00123

ESP6500AA

AF:

0.00272

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000272

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:3Benign:1

Jan 06, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Apr 02, 2020

Revvity Omics, Revvity

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Aug 17, 2017

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jun 18, 2021

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Has not been previously published as pathogenic or benign to our knowledge; In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 27535533) -

not specified

Uncertain:1Benign:2

Feb 27, 2024

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

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: HSPG2 c.149A>T (p.His50Leu) results in a non-conservative amino acid change in the encoded protein sequence. Three of four in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00017 in 1606848 control chromosomes, predominantly at a frequency of 0.0033 within the African or African-American subpopulation in the gnomAD database. This frequency is higher than the estimated maximum expected for a pathogenic variant in HSPG2 causing Schwartz Jampel Syndrome Type 1 (~0.00056), suggesting that the variant might be benign. To our knowledge, no occurrence of c.149A>T in individuals affected with Schwartz Jampel Syndrome Type 1 and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 373152). Based on the evidence outlined above, the variant was classified as likely benign. -

Nov 04, 2016

Athena Diagnostics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Nov 22, 2016

GeneDx

Significance:Uncertain significance

Review Status:flagged submission

Collection Method:clinical testing

The H50L variant in the HSPG2 gene has not been reported previously as a pathogenic variant, nor as a benign variant, to our knowledge. Although not present in the homozygous state, the NHLBI ESP Exome Sequencing Project reports H50L was observed in 12/4406 (0.27%) alleles from individuals of African American background, indicating it may be a rare variant in this population. The H50L variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is not conserved. In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. We interpret H50Las a variant of uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.085

BayesDel_addAF

Benign

-0.37

BayesDel_noAF

Benign

-0.31

CADD

Benign

(source)

DANN

Benign

0.92

DEOGEN2

Benign

0.27

Eigen

Benign

-0.81

Eigen_PC

Benign

-0.76

FATHMM_MKL

Benign

0.16

LIST_S2

Benign

0.34

M_CAP

Benign

0.017

MetaRNN

Benign

0.0092

MetaSVM

Benign

-0.90

MutationAssessor

Benign

0.0

PhyloP100

1.2

PrimateAI

Benign

0.33

PROVEAN

Benign

-1.8

REVEL

Benign

0.079

Sift

Uncertain

0.017

Sift4G

Uncertain

0.0060

Polyphen

0.0050

Vest4

0.41

MVP

0.58

MPC

0.25

ClinPred

0.0079

GERP RS

3.7

Varity_R

0.15

gMVP

0.46

Mutation Taster

=92/8

polymorphism

(source)

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

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1-21896225-T-A

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over