1-203181235-C-T

Variant names:

• chr1-203181235-C-T
• rs368942218
• NM_001276.4:c.638G>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_001276.4(CHI3L1):​c.638G>A​(p.Arg213His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000118 in 1,614,028 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 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. R213C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000079 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00012 (0 hom.)
• Consequence: CHI3L1 NM_001276.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.48
• Publications: 1 publications found

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 Gene-Disease associations (from GenCC):

• schizophrenia

  Inheritance: Unknown Classification: NO_KNOWN Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

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

• BP4: Computational evidence support a benign effect (MetaRNN=0.07966912).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001276.4. 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
	CHI3L1	NM_001276.4	MANE Select	c.638G>A	p.Arg213His	missense	Exon 7 of 10	NP_001267.2	P36222

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHI3L1	ENST00000255409.8	TSL:1 MANE Select	c.638G>A	p.Arg213His	missense	Exon 7 of 10	ENSP00000255409.3	P36222
	CHI3L1	ENST00000874779.1		c.848G>A	p.Arg283His	missense	Exon 9 of 12	ENSP00000544838.1
	CHI3L1	ENST00000874774.1		c.656G>A	p.Arg219His	missense	Exon 7 of 10	ENSP00000544833.1

Frequencies

GnomAD3 genomes AF: 0.0000789 AC: 12 AN: 152174 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000132

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000915 AC: 23 AN: 251308 AF XY: 0.0000957

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000579

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000122 AC: 178 AN: 1461736 Hom.: 0 Cov.: 31 AF XY: 0.000117 AC XY: 85 AN XY: 727170

African (AFR) AF: 0.0000597 AC: 2 AN: 33480

American (AMR) AF: 0.0000895 AC: 4 AN: 44712

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26130

East Asian (EAS) AF: 0.00 AC: 0 AN: 39688

South Asian (SAS) AF: 0.0000696 AC: 6 AN: 86238

European-Finnish (FIN) AF: 0.0000187 AC: 1 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.000144 AC: 160 AN: 1111912

Other (OTH) AF: 0.0000828 AC: 5 AN: 60390

GnomAD4 genome AF: 0.0000788 AC: 12 AN: 152292 Hom.: 0 Cov.: 33 AF XY: 0.0000134 AC XY: 1 AN XY: 74462

African (AFR) AF: 0.00 AC: 0 AN: 41552

American (AMR) AF: 0.0000654 AC: 1 AN: 15302

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.000193 AC: 1 AN: 5182

South Asian (SAS) AF: 0.00 AC: 0 AN: 4832

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10606

Middle Eastern (MID) AF: 0.00340 AC: 1 AN: 294

European-Non Finnish (NFE) AF: 0.000132 AC: 9 AN: 68026

Other (OTH) AF: 0.00 AC: 0 AN: 2116

Alfa AF: 0.000107 Hom.: 0

Bravo AF: 0.0000756

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.0000988 AC: 12

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.000109

EpiControl AF: 0.000178

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	0.10
BayesDel_addAF	Benign	-0.41	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	16
DANN	Uncertain	0.98
DEOGEN2	Benign	0.065	T
Eigen	Benign	-0.40
Eigen_PC	Benign	-0.38
FATHMM_MKL	Benign	0.35	N
LIST_S2	Uncertain	0.90	D
M_CAP	Benign	0.0078	T
MetaRNN	Benign	0.080	T
MetaSVM	Benign	-0.95	T
MutationAssessor	Uncertain	2.0	M
PhyloP100		1.5
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-0.18	N
REVEL	Benign	0.034
Sift	Uncertain	0.011	D
Sift4G	Uncertain	0.013	D
Polyphen		0.018	B
Vest4		0.15
MVP		0.21
MPC		0.085
ClinPred		0.10	T
GERP RS		2.7
Varity_R		0.19
gMVP		0.57
Mutation Taster		=81/19	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: rs368942218; hg19: chr1-203150363;