Genetic Variant CHI3L2:p.His215Arg (chr1-111236062-A-G) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_004000.3(CHI3L2):c.644A>G(p.His215Arg) variant causes a missense change. The variant allele was found at a frequency of 0.0000539 in 1,614,212 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000056 ( 1 hom. )

Consequence

CHI3L2
NM_004000.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.76

Variant links:

Genes affected

CHI3L2 (HGNC:1933): (chitinase 3 like 2) The protein encoded by this gene is similar to bacterial chitinases but lacks chitinase activity. The encoded protein is secreted and is involved in cartilage biogenesis. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Apr 2012]

CHI3L2 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
CHI3L2	NM_004000.3 link	c.644A>G	p.His215Arg	missense_variant	Exon 7 of 11	ENST00000369748.9	NP_003991.2	Q15782-4
CHI3L2	NM_001025197.1 link	c.614A>G	p.His205Arg	missense_variant	Exon 6 of 10		NP_001020368.1	Q15782-6
CHI3L2	NM_001025199.2 link	c.407A>G	p.His136Arg	missense_variant	Exon 6 of 10		NP_001020370.1	Q15782-5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHI3L2	ENST00000369748.9 link	c.644A>G	p.His215Arg	missense_variant	Exon 7 of 11	1	NM_004000.3	ENSP00000358763.4		Q15782-4

Frequencies

GnomAD3 genomes

AF:

0.0000328

AC:

AN:

152208

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:

0.00104

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000795

AC:

AN:

251480

Hom.:

AF XY:

0.000118

AC XY:

AN XY:

135910

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000653

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000561

AC:

AN:

1461886

Hom.:

Cov.:

AF XY:

0.0000839

AC XY:

AN XY:

727242

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000893

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000828

GnomAD4 genome

AF:

0.0000328

AC:

AN:

152326

Hom.:

Cov.:

AF XY:

0.0000671

AC XY:

AN XY:

74484

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00104

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ExAC

AF:

0.000140

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jul 12, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.644A>G (p.H215R) alteration is located in exon 7 (coding exon 7) of the CHI3L2 gene. This alteration results from a A to G substitution at nucleotide position 644, causing the histidine (H) at amino acid position 215 to be replaced by an arginine (R). 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

Benign

0.21

BayesDel_addAF

Benign

-0.34

BayesDel_noAF

Benign

-0.36

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.097

T;.;.;T;.;.;.;.;T

Eigen

Benign

0.097

Eigen_PC

Benign

0.057

FATHMM_MKL

Uncertain

0.90

LIST_S2

Uncertain

0.86

.;D;T;T;.;D;D;D;D

M_CAP

Benign

0.011

MetaRNN

Uncertain

0.60

D;D;D;D;D;D;D;D;D

MetaSVM

Benign

-1.0

MutationAssessor

Uncertain

2.4

M;.;.;M;.;.;.;.;.

PrimateAI

Uncertain

0.55

PROVEAN

Pathogenic

-7.2

D;D;D;D;D;D;D;D;D

REVEL

Benign

0.21

Sift

Benign

0.030

D;D;D;D;D;D;D;D;D

Sift4G

Uncertain

0.015

D;D;D;D;D;D;D;D;D

Polyphen

1.0

D;.;.;D;.;.;.;.;.

Vest4

0.64

MutPred

0.87

Loss of disorder (P = 0.1232);Loss of disorder (P = 0.1232);.;Loss of disorder (P = 0.1232);.;.;.;.;.;

MVP

0.51

MPC

0.12

ClinPred

0.53

GERP RS

1.8

Varity_R

0.64

gMVP

0.69

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

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