rs137852607

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS2

The NM_003465.3(CHIT1):c.220G>A(p.Glu74Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0044 in 1,613,996 control chromosomes in the GnomAD database, including 26 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E74G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0034 ( 2 hom., cov: 31)

Exomes 𝑓: 0.0045 ( 24 hom. )

Consequence

CHIT1
NM_003465.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:1O:1

Conservation

PhyloP100: 0.709

Publications

10 publications found

Variant links:

Genes affected

CHIT1 (HGNC:1936): (chitinase 1) Chitotriosidase is secreted by activated human macrophages and is markedly elevated in plasma of Gaucher disease patients. The expression of chitotriosidase occurs only at a late stage of differentiation of monocytes to activated macrophages in culture. Human macrophages can synthesize a functional chitotriosidase, a highly conserved enzyme with a strongly regulated expression. This enzyme may play a role in the degradation of chitin-containing pathogens. Several alternatively spliced transcript variants have been described for this gene. [provided by RefSeq, Jan 2012]

CHIT1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.040317446).

BP6

Variant 1-203225706-C-T is Benign according to our data. Variant chr1-203225706-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 9525.

BS2

High Homozygotes in GnomAd4 at 2 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003465.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CHIT1	NM_003465.3	MANE Select	c.220G>A	p.Glu74Lys	missense	Exon 3 of 11	NP_003456.1	Q13231-1
CHIT1	NM_001256125.2		c.220G>A	p.Glu74Lys	missense	Exon 3 of 10	NP_001243054.2	Q13231-4
CHIT1	NR_045784.2		n.257G>A		non_coding_transcript_exon	Exon 3 of 13

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CHIT1	ENST00000367229.6	TSL:1 MANE Select	c.220G>A	p.Glu74Lys	missense	Exon 3 of 11	ENSP00000356198.1	Q13231-1
CHIT1	ENST00000491855.5	TSL:1	n.220G>A		non_coding_transcript_exon	Exon 3 of 12	ENSP00000423778.1	Q13231-2
CHIT1	ENST00000503786.1	TSL:1	n.220G>A		non_coding_transcript_exon	Exon 3 of 13	ENSP00000421617.1	D6REY1

Frequencies

GnomAD3 genomes

AF:

0.00344

AC:

523

AN:

152096

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00104

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00786

Gnomad ASJ

AF:

0.0112

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00311

Gnomad FIN

AF:

0.00283

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.00384

Gnomad OTH

AF:

0.00669

GnomAD2 exomes

AF:

0.00342

AC:

860

AN:

251470

AF XY:

0.00347

show subpopulations

Gnomad AFR exome

AF:

0.000923

Gnomad AMR exome

AF:

0.00321

Gnomad ASJ exome

AF:

0.0122

Gnomad EAS exome

AF:

0.0000544

Gnomad FIN exome

AF:

0.00254

Gnomad NFE exome

AF:

0.00395

Gnomad OTH exome

AF:

0.00407

GnomAD4 exome

AF:

0.00450

AC:

6582

AN:

1461782

Hom.:

Cov.:

AF XY:

0.00437

AC XY:

3179

AN XY:

727188

show subpopulations

African (AFR)

AF:

0.000627

AC:

AN:

33478

American (AMR)

AF:

0.00360

AC:

161

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.0124

AC:

325

AN:

26134

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39700

South Asian (SAS)

AF:

0.00264

AC:

228

AN:

86258

European-Finnish (FIN)

AF:

0.00311

AC:

166

AN:

53390

Middle Eastern (MID)

AF:

0.00139

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00482

AC:

5361

AN:

1111940

Other (OTH)

AF:

0.00515

AC:

311

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.480

Heterozygous variant carriers

398

796

1193

1591

1989

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

218

436

654

872

1090

<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:

0.00344

AC:

523

AN:

152214

Hom.:

Cov.:

AF XY:

0.00312

AC XY:

232

AN XY:

74414

show subpopulations

African (AFR)

AF:

0.00104

AC:

AN:

41544

American (AMR)

AF:

0.00785

AC:

120

AN:

15290

Ashkenazi Jewish (ASJ)

AF:

0.0112

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5176

South Asian (SAS)

AF:

0.00311

AC:

AN:

4816

European-Finnish (FIN)

AF:

0.00283

AC:

AN:

10600

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00384

AC:

261

AN:

67998

Other (OTH)

AF:

0.00662

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.497

Heterozygous variant carriers

114

142

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome 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

Alfa

AF:

0.00398

Hom.:

Bravo

AF:

0.00360

TwinsUK

AF:

0.00647

AC:

ALSPAC

AF:

0.00571

AC:

ESP6500AA

AF:

0.00113

AC:

ESP6500EA

AF:

0.00465

AC:

ExAC

AF:

0.00320

AC:

389

Asia WGS

AF:

0.000577

AC:

AN:

3478

EpiCase

AF:

0.00474

EpiControl

AF:

0.00468

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Chitotriosidase deficiency (3)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.072

BayesDel_addAF

Benign

-0.44

BayesDel_noAF

Benign

-0.41

CADD

Benign

8.9

(source)

DANN

Benign

0.70

DEOGEN2

Benign

0.25

Eigen

Benign

-0.93

Eigen_PC

Benign

-0.96

FATHMM_MKL

Benign

0.10

LIST_S2

Benign

0.81

M_CAP

Benign

0.012

MetaRNN

Benign

0.040

MetaSVM

Benign

-0.91

MutationAssessor

Benign

1.7

PhyloP100

0.71

PrimateAI

Benign

0.27

PROVEAN

Benign

-2.0

REVEL

Benign

0.28

Sift

Benign

0.37

Sift4G

Benign

0.76

Polyphen

0.062

Vest4

0.67

MVP

0.25

MPC

0.11

ClinPred

0.0054

GERP RS

0.79

Varity_R

0.27

gMVP

0.49

Mutation Taster

=94/6

polymorphism

(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

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over