1-21925769-A-G

Variant names:

• chr1-21925769-A-G
• rs4654773
• NM_005529.7:c.63+11386T>C

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_005529.7(HSPG2):​c.63+11386T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.67 in 152,052 control chromosomes in the GnomAD database, including 38,752 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.67 (38752 hom., cov: 31)
• Consequence: HSPG2 NM_005529.7 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.00
• Publications: 8 publications found

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

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.92).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.851 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HSPG2	NM_005529.7	c.63+11386T>C		intron_variant	Intron 1 of 96	ENST00000374695.8	NP_005520.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HSPG2	ENST00000374695.8	c.63+11386T>C		intron_variant	Intron 1 of 96	1	NM_005529.7	ENSP00000363827.3

Frequencies

GnomAD3 genomes AF: 0.670 AC: 101823 AN: 151934 Hom.: 38745 Cov.: 31

Gnomad AFR AF: 0.285

Gnomad AMI AF: 0.745

Gnomad AMR AF: 0.744

Gnomad ASJ AF: 0.863

Gnomad EAS AF: 0.566

Gnomad SAS AF: 0.802

Gnomad FIN AF: 0.774

Gnomad MID AF: 0.801

Gnomad NFE AF: 0.857

Gnomad OTH AF: 0.712

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.670 AC: 101848 AN: 152052 Hom.: 38752 Cov.: 31 AF XY: 0.672 AC XY: 49987 AN XY: 74346

African (AFR) AF: 0.285 AC: 11825 AN: 41444

American (AMR) AF: 0.743 AC: 11361 AN: 15286

Ashkenazi Jewish (ASJ) AF: 0.863 AC: 2994 AN: 3470

East Asian (EAS) AF: 0.566 AC: 2928 AN: 5172

South Asian (SAS) AF: 0.803 AC: 3870 AN: 4822

European-Finnish (FIN) AF: 0.774 AC: 8176 AN: 10566

Middle Eastern (MID) AF: 0.793 AC: 233 AN: 294

European-Non Finnish (NFE) AF: 0.857 AC: 58275 AN: 67976

Other (OTH) AF: 0.714 AC: 1507 AN: 2110

Alfa AF: 0.794 Hom.: 120118

Bravo AF: 0.648

Asia WGS AF: 0.638 AC: 2220 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.92
CADD	Benign	0.018
DANN	Benign	0.56
PhyloP100		-2.0
Mutation Taster		=100/0	polymorphism (auto)

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

Other links and lift over

dbSNP: rs4654773; hg19: chr1-22252262;