1-21897609-A-G

Position:

• chr1-21897609-A-G

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_005529.7(HSPG2):​c.64-1299T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.239 in 152,120 control chromosomes in the GnomAD database, including 5,249 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 0.24 (5249 hom., cov: 32)
• Consequence: HSPG2 NM_005529.7 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.304

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.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.85).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.377 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HSPG2	NM_005529.7	c.64-1299T>C		intron_variant		ENST00000374695.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HSPG2	ENST00000374695.8	c.64-1299T>C		intron_variant		1	NM_005529.7	P1

Frequencies

GnomAD3 genomes AF: 0.239 AC: 36305 AN: 152002 Hom.: 5246 Cov.: 32

Gnomad AFR AF: 0.0838

Gnomad AMI AF: 0.352

Gnomad AMR AF: 0.357

Gnomad ASJ AF: 0.210

Gnomad EAS AF: 0.392

Gnomad SAS AF: 0.295

Gnomad FIN AF: 0.301

Gnomad MID AF: 0.234

Gnomad NFE AF: 0.282

Gnomad OTH AF: 0.239

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

GnomAD4 genome AF: 0.239 AC: 36304 AN: 152120 Hom.: 5249 Cov.: 32 AF XY: 0.243 AC XY: 18064 AN XY: 74350

Gnomad4 AFR AF: 0.0836

Gnomad4 AMR AF: 0.357

Gnomad4 ASJ AF: 0.210

Gnomad4 EAS AF: 0.391

Gnomad4 SAS AF: 0.295

Gnomad4 FIN AF: 0.301

Gnomad4 NFE AF: 0.282

Gnomad4 OTH AF: 0.236

Alfa AF: 0.275 Hom.: 12505

Bravo AF: 0.235

Asia WGS AF: 0.311 AC: 1084 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	0.86
DANN	Benign	0.67

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs11810496; hg19: chr1-22224102;