rs200225298

Positions:

• chr1-21836970-G-A

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 1P and 13B. PP2 BP4_Strong BP6 BS1 BS2

The NM_005529.7(HSPG2):​c.10187C>T​(p.Ala3396Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000565 in 1,554,222 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/21 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 0.00040 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00058 (4 hom.)
• Consequence: HSPG2 NM_005529.7 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6 B:2
• Conservation: PhyloP100: 2.71

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 -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=0.041508794).
• BP6: Variant 1-21836970-G-A is Benign according to our data. Variant chr1-21836970-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 289408.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=6, Likely_benign=2}.
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000401 (61/152228) while in subpopulation AMR AF= 0.000785 (12/15290). AF 95% confidence interval is 0.000457. There are 0 homozygotes in gnomad4. There are 29 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAdExome4 at 4 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HSPG2	NM_005529.7	c.10187C>T	p.Ala3396Val	missense_variant	75/97	ENST00000374695.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HSPG2	ENST00000374695.8	c.10187C>T	p.Ala3396Val	missense_variant	75/97	1	NM_005529.7	P1
HSPG2	ENST00000374676.4	c.183-1333C>T		intron_variant		3

Frequencies

GnomAD3 genomes AF: 0.000401 AC: 61 AN: 152228 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000121

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000785

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: 0.000603

Gnomad OTH AF: 0.00143

GnomAD3 exomes AF: 0.000436 AC: 70 AN: 160388 Hom.: 1 AF XY: 0.000567 AC XY: 48 AN XY: 84614

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000518

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000522

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000692

Gnomad OTH exome AF: 0.000221

GnomAD4 exome AF: 0.000583 AC: 817 AN: 1401994 Hom.: 4 Cov.: 33 AF XY: 0.000607 AC XY: 420 AN XY: 691856

Gnomad4 AFR exome AF: 0.000126

Gnomad4 AMR exome AF: 0.000554

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000604

Gnomad4 FIN exome AF: 0.0000411

Gnomad4 NFE exome AF: 0.000626

Gnomad4 OTH exome AF: 0.000584

GnomAD4 genome AF: 0.000401 AC: 61 AN: 152228 Hom.: 0 Cov.: 32 AF XY: 0.000390 AC XY: 29 AN XY: 74366

Gnomad4 AFR AF: 0.000121

Gnomad4 AMR AF: 0.000785

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000603

Gnomad4 OTH AF: 0.00143

Alfa AF: 0.000497 Hom.: 0

Bravo AF: 0.000631

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000519 AC: 2

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000353 AC: 3

ExAC AF: 0.000250 AC: 28

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:2 Benign:2

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 13, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jun 27, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	Invitae	Jan 11, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Nov 15, 2019	- -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Athena Diagnostics

Sep 12, 2016

- -

Lethal Kniest-like syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 28, 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 did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 09, 2022

The c.10187C>T (p.A3396V) alteration is located in exon 74 (coding exon 74) of the HSPG2 gene. This alteration results from a C to T substitution at nucleotide position 10187, causing the alanine (A) at amino acid position 3396 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Schwartz-Jampel syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 28, 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 did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.094
BayesDel_addAF	Benign	-0.46	T
BayesDel_noAF	Benign	-0.51
CADD	Benign	16
DANN	Uncertain	0.99
DEOGEN2	Benign	0.21	T
Eigen	Benign	-0.56
Eigen_PC	Benign	-0.51
FATHMM_MKL	Benign	0.62	D
LIST_S2	Benign	0.70	T
M_CAP	Benign	0.0079	T
MetaRNN	Benign	0.042	T
MetaSVM	Benign	-0.95	T
MutationAssessor	Benign	0.63	N
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-1.2	N
REVEL	Benign	0.034
Sift	Benign	0.19	T
Sift4G	Benign	0.15	T
Polyphen		0.0050	B
Vest4		0.13
MVP		0.57
MPC		0.20
ClinPred		0.020	T
GERP RS		2.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.020
gMVP		0.27

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs200225298; hg19: chr1-22163463;