rs140139732

Positions:

• chr1-21828852-G-A

Variant summary

Our verdict is Benign. Variant got -19 ACMG points: 1P and 20B. PP2 BP4_Strong BP6_Very_Strong BS1 BS2

The NM_005529.7(HSPG2):​c.12220C>T​(p.Arg4074Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00187 in 1,551,072 control chromosomes in the GnomAD database, including 20 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R4074H) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.0030 (7 hom., cov: 33)
  • Exomes 𝑓: 0.0017 (13 hom.)
• Consequence: HSPG2 NM_005529.7 missense
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:7
• Conservation: PhyloP100: 2.08

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]

ACMG classification

Verdict is Benign. Variant got -19 ACMG points.

• PP2: Missense variant where missense usually causes diseases, HSPG2
• BP4: Computational evidence support a benign effect (MetaRNN=0.021296978).
• BP6: Variant 1-21828852-G-A is Benign according to our data. Variant chr1-21828852-G-A is described in ClinVar as [Benign]. Clinvar id is 447539.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-21828852-G-A is described in Lovd as [Likely_benign].
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00296 (450/152238) while in subpopulation NFE AF= 0.00191 (130/67998). AF 95% confidence interval is 0.00164. There are 7 homozygotes in gnomad4. There are 327 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 7 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HSPG2	NM_005529.7	c.12220C>T	p.Arg4074Cys	missense_variant	88/97	ENST00000374695.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HSPG2	ENST00000374695.8	c.12220C>T	p.Arg4074Cys	missense_variant	88/97	1	NM_005529.7	P1
HSPG2	ENST00000486901.1	n.1559C>T		non_coding_transcript_exon_variant	2/11	2

Frequencies

GnomAD3 genomes AF: 0.00296 AC: 450 AN: 152120 Hom.: 7 Cov.: 33

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000458

Gnomad ASJ AF: 0.00144

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0289

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00191

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.00337 AC: 525 AN: 155730 Hom.: 8 AF XY: 0.00307 AC XY: 252 AN XY: 82100

Gnomad AFR exome AF: 0.000114

Gnomad AMR exome AF: 0.000202

Gnomad ASJ exome AF: 0.00164

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000876

Gnomad FIN exome AF: 0.0273

Gnomad NFE exome AF: 0.00132

Gnomad OTH exome AF: 0.000907

GnomAD4 exome AF: 0.00175 AC: 2447 AN: 1398834 Hom.: 13 Cov.: 33 AF XY: 0.00169 AC XY: 1169 AN XY: 690000

Gnomad4 AFR exome AF: 0.000190

Gnomad4 AMR exome AF: 0.000336

Gnomad4 ASJ exome AF: 0.00119

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000252

Gnomad4 FIN exome AF: 0.0252

Gnomad4 NFE exome AF: 0.00101

Gnomad4 OTH exome AF: 0.00148

GnomAD4 genome AF: 0.00296 AC: 450 AN: 152238 Hom.: 7 Cov.: 33 AF XY: 0.00439 AC XY: 327 AN XY: 74446

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.000457

Gnomad4 ASJ AF: 0.00144

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.0289

Gnomad4 NFE AF: 0.00191

Gnomad4 OTH AF: 0.00

Alfa AF: 0.00160 Hom.: 1

Bravo AF: 0.000608

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.00104 AC: 4

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.00144 AC: 12

ExAC AF: 0.00111 AC: 112

ClinVar

Significance: Benign

Submissions summary: Benign:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:3

Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 23, 2021	This variant is associated with the following publications: (PMID: 25504735) -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Dec 05, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 24, 2024	- -

Lethal Kniest-like syndrome Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 16, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. -

HSPG2-related disorder Benign:1

Benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Mar 18, 2020

This variant is classified as 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

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 16, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. -

Connective tissue disorder Benign:1

Benign, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Aug 18, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Benign	-0.35	T
BayesDel_noAF	Benign	-0.28
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.78	D
Eigen	Uncertain	0.26
Eigen_PC	Benign	0.19
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Uncertain	0.90	D
MetaRNN	Benign	0.021	T
MetaSVM	Uncertain	-0.010	T
MutationAssessor	Uncertain	2.0	M
MutationTaster	Benign	0.53	D
PrimateAI	Benign	0.23	T
PROVEAN	Uncertain	-3.1	D
REVEL	Uncertain	0.45
Sift	Benign	0.071	T
Sift4G	Uncertain	0.0020	D
Polyphen		0.99	D
Vest4		0.48
MVP		0.81
MPC		0.83
ClinPred		0.058	T
GERP RS		4.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.088
gMVP		0.65

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: rs140139732; hg19: chr1-22155345; COSMIC: COSV100760712; COSMIC: COSV100760712;