Genetic Variant HAPLN1:p.Arg169His (chr5-83644632-C-T) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PP3_ModerateBS2

The NM_001884.4(HAPLN1):c.506G>A(p.Arg169His) variant causes a missense change. The variant allele was found at a frequency of 0.0000128 in 1,488,850 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R169C) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000013 ( 0 hom. )

Consequence

HAPLN1
NM_001884.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 4.73

Publications

0 publications found

Variant links:

Genes affected

HAPLN1 (HGNC:2380): (hyaluronan and proteoglycan link protein 1) Predicted to enable hyaluronic acid binding activity. Predicted to be an extracellular matrix structural constituent conferring compression resistance. Predicted to be involved in central nervous system development and skeletal system development. Colocalizes with collagen-containing extracellular matrix. [provided by Alliance of Genome Resources, Apr 2022]

HAPLN1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.854

BS2

High AC in GnomAdExome4 at 18 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001884.4. 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
	HAPLN1	NM_001884.4	MANE Select	c.506G>A	p.Arg169His	missense	Exon 4 of 5	NP_001875.1	P10915

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
HAPLN1	ENST00000274341.9	TSL:1 MANE Select	c.506G>A	p.Arg169His	missense	Exon 4 of 5	ENSP00000274341.4	P10915
HAPLN1	ENST00000875523.1		c.506G>A	p.Arg169His	missense	Exon 5 of 6	ENSP00000545582.1
HAPLN1	ENST00000936313.1		c.506G>A	p.Arg169His	missense	Exon 4 of 5	ENSP00000606372.1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152162

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.000478

GnomAD2 exomes

AF:

0.0000123

AC:

AN:

162170

AF XY:

0.0000116

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000777

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000125

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000135

AC:

AN:

1336688

Hom.:

Cov.:

AF XY:

0.0000168

AC XY:

AN XY:

654684

show subpopulations

African (AFR)

AF:

0.0000350

AC:

AN:

28598

American (AMR)

AF:

0.00

AC:

AN:

28278

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19930

East Asian (EAS)

AF:

0.0000849

AC:

AN:

35322

South Asian (SAS)

AF:

0.00

AC:

AN:

66700

European-Finnish (FIN)

AF:

0.00

AC:

AN:

49666

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5168

European-Non Finnish (NFE)

AF:

0.0000134

AC:

AN:

1048292

Other (OTH)

AF:

0.00

AC:

AN:

54734

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.453

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152162

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74326

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

41434

American (AMR)

AF:

0.00

AC:

AN:

15284

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68024

Other (OTH)

AF:

0.000478

AC:

AN:

2094

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.275

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

ExAC

AF:

0.00000829

AC:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.34

BayesDel_addAF

Benign

-0.042

BayesDel_noAF

Benign

-0.11

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.39

Eigen

Pathogenic

0.84

Eigen_PC

Pathogenic

0.80

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.96

M_CAP

Benign

0.037

MetaRNN

Pathogenic

0.85

MetaSVM

Benign

-0.79

MutationAssessor

Pathogenic

3.1

PhyloP100

4.7

PrimateAI

Uncertain

0.65

PROVEAN

Pathogenic

-4.8

REVEL

Uncertain

0.35

Sift

Uncertain

0.0010

Sift4G

Pathogenic

0.0010

Polyphen

1.0

Vest4

0.78

MutPred

0.81

Loss of methylation at R169 (P = 0.0638)

MVP

0.69

MPC

0.75

ClinPred

0.99

GERP RS

5.8

Varity_R

0.62

gMVP

0.79

Mutation Taster

=43/57

disease causing

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over