chr1-156624123-C-G

Variant names:

• chr1-156624123-C-G
• rs1326497740
• NM_021817.3:c.402C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_021817.3(HAPLN2):​c.402C>G​(p.Ile134Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,358 control chromosomes in the GnomAD database, with no homozygous occurrence. 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 Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I134V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: HAPLN2 NM_021817.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.91
• Publications: 1 publications found

Genes affected

HAPLN2 (HGNC:17410): (hyaluronan and proteoglycan link protein 2) Predicted to enable hyaluronic acid binding activity. Predicted to be involved in central nervous system development and skeletal system development. Predicted to act upstream of or within establishment of blood-nerve barrier and extracellular matrix assembly. Predicted to be located in extracellular region. Predicted to be active in extracellular matrix. [provided by Alliance of Genome Resources, Apr 2022]

BCAN-AS2 (HGNC:56267): (BCAN antisense RNA 2)

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.09682962).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_021817.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HAPLN2	NM_021817.3	MANE Select	c.402C>G	p.Ile134Met	missense	Exon 4 of 7	NP_068589.1	Q9GZV7

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HAPLN2	ENST00000255039.6	TSL:1 MANE Select	c.402C>G	p.Ile134Met	missense	Exon 4 of 7	ENSP00000255039.1	Q9GZV7
	HAPLN2	ENST00000858239.1		c.444C>G	p.Ile148Met	missense	Exon 4 of 7	ENSP00000528298.1
	HAPLN2	ENST00000968562.1		c.444C>G	p.Ile148Met	missense	Exon 4 of 7	ENSP00000638621.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000817 AC: 2 AN: 244786 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000581

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461358 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727016

African (AFR) AF: 0.00 AC: 0 AN: 33476

American (AMR) AF: 0.0000224 AC: 1 AN: 44690

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26100

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39692

South Asian (SAS) AF: 0.00 AC: 0 AN: 86236

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53132

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5760

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111894

Other (OTH) AF: 0.0000166 AC: 1 AN: 60378

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.31	T
BayesDel_noAF	Benign	-0.51
CADD	Benign	11
DANN	Benign	0.92
DEOGEN2	Benign	0.089	T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.078	N
LIST_S2	Benign	0.77	T
M_CAP	Benign	0.018	T
MetaRNN	Benign	0.097	T
MetaSVM	Benign	-1.1	T
PhyloP100		-1.9
PrimateAI	Uncertain	0.50	T
PROVEAN	Benign	0.010	N
REVEL	Benign	0.10
Sift	Benign	0.14	T
Sift4G	Benign	0.13	T
Polyphen		0.0020	B
Vest4		0.17
MutPred		0.70		Gain of catalytic residue at I134 (P = 0.0451)
MVP		0.32
MPC		0.84
ClinPred		0.038	T
GERP RS		-7.9
Varity_R		0.076
gMVP		0.50
Mutation Taster		=95/5	polymorphism

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: rs1326497740; hg19: chr1-156593915; COSMIC: COSV54815383; COSMIC: COSV54815383;