Variant 1-203180597-A-G details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2PP3_Strong

The ENST00000255409.8(CHI3L1):c.767T>C(p.Met256Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,460,820 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

CHI3L1
ENST00000255409.8 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 8.64

Variant links:

Genes affected

CHI3L1 (HGNC:1932): (chitinase 3 like 1) Chitinases catalyze the hydrolysis of chitin, which is an abundant glycopolymer found in insect exoskeletons and fungal cell walls. The glycoside hydrolase 18 family of chitinases includes eight human family members. This gene encodes a glycoprotein member of the glycosyl hydrolase 18 family. The protein lacks chitinase activity and is secreted by activated macrophages, chondrocytes, neutrophils and synovial cells. The protein is thought to play a role in the process of inflammation and tissue remodeling. [provided by RefSeq, Sep 2009]

CHI3L1 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.941

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHI3L1	NM_001276.4 linkuse as main transcript	c.767T>C	p.Met256Thr	missense_variant	8/10	ENST00000255409.8	NP_001267.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris
CHI3L1	ENST00000255409.8 linkuse as main transcript	c.767T>C	p.Met256Thr	missense_variant	8/10	1	NM_001276.4	ENSP00000255409	P1
CHI3L1	ENST00000404436.2 linkuse as main transcript	c.199+565T>C		intron_variant		2		ENSP00000385350
CHI3L1	ENST00000472064.1 linkuse as main transcript	n.291T>C		non_coding_transcript_exon_variant	3/3	2
CHI3L1	ENST00000473185.1 linkuse as main transcript	n.973+565T>C		intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1460820

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726710

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000180

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 09, 2021

The c.767T>C (p.M256T) alteration is located in exon 8 (coding exon 8) of the CHI3L1 gene. This alteration results from a T to C substitution at nucleotide position 767, causing the methionine (M) at amino acid position 256 to be replaced by a threonine (T). 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

Uncertain

0.53

BayesDel_addAF

Uncertain

0.062

BayesDel_noAF

Benign

-0.15

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Benign

0.33

Eigen

Pathogenic

0.92

Eigen_PC

Pathogenic

0.85

FATHMM_MKL

Uncertain

0.93

LIST_S2

Benign

0.86

M_CAP

Benign

0.024

MetaRNN

Pathogenic

0.94

MetaSVM

Benign

-0.89

MutationAssessor

Pathogenic

3.7

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.61

PROVEAN

Uncertain

-4.0

REVEL

Uncertain

0.39

Sift

Uncertain

0.0010

Sift4G

Uncertain

0.0020

Polyphen

0.98

Vest4

0.81

MutPred

0.81

Gain of phosphorylation at M256 (P = 0.0532);

MVP

0.41

MPC

0.43

ClinPred

1.0

GERP RS

5.5

Varity_R

0.96

gMVP

0.75

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

No publications associated with this variant yet.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over