Genetic Variant HAPLN2:p.Val249Leu (chr1-156625106-G-C) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_021817.3(HAPLN2):c.745G>C(p.Val249Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000975 in 1,537,914 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000094 ( 0 hom. )

Consequence

HAPLN2
NM_021817.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 9.48

Variant links:

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]

HAPLN2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HAPLN2	NM_021817.3 link	c.745G>C	p.Val249Leu	missense_variant	Exon 7 of 7	ENST00000255039.6	NP_068589.1	Q9GZV7
HAPLN2	XM_011509853.3 link	c.745G>C	p.Val249Leu	missense_variant	Exon 7 of 7		XP_011508155.1	Q9GZV7
HAPLN2	XM_017002020.2 link	c.745G>C	p.Val249Leu	missense_variant	Exon 8 of 8		XP_016857509.1	Q9GZV7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HAPLN2	ENST00000255039.6 link	c.745G>C	p.Val249Leu	missense_variant	Exon 7 of 7	1	NM_021817.3	ENSP00000255039.1		Q9GZV7
HAPLN2	ENST00000494218.1 link	n.593G>C		non_coding_transcript_exon_variant	Exon 3 of 3	2

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152184

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000960

AC:

AN:

135442

Hom.:

AF XY:

0.0000677

AC XY:

AN XY:

73842

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000532

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS 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:

0.00000938

AC:

AN:

1385730

Hom.:

Cov.:

AF XY:

0.00000731

AC XY:

AN XY:

683886

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000365

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152184

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74332

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000340

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Nov 18, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.745G>C (p.V249L) alteration is located in exon 7 (coding exon 5) of the HAPLN2 gene. This alteration results from a G to C substitution at nucleotide position 745, causing the valine (V) at amino acid position 249 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.59

BayesDel_addAF

Benign

-0.33

BayesDel_noAF

Benign

-0.36

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.26

Eigen

Uncertain

0.62

Eigen_PC

Uncertain

0.55

FATHMM_MKL

Uncertain

0.97

LIST_S2

Benign

0.68

M_CAP

Benign

0.040

MetaRNN

Uncertain

0.63

MetaSVM

Benign

-1.1

PrimateAI

Pathogenic

0.90

PROVEAN

Benign

-1.9

REVEL

Benign

0.23

Sift

Uncertain

0.019

Sift4G

Benign

0.099

Polyphen

0.97

Vest4

0.58

MutPred

0.72

Gain of sheet (P = 0.1451);

MVP

0.59

MPC

1.5

ClinPred

0.64

GERP RS

4.4

Varity_R

0.25

gMVP

0.88

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over