Variant 1-203216804-C-T details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_StrongBS1_SupportingBS2

The NM_003465.3(CHIT1):c.*85G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00146 in 1,576,016 control chromosomes in the GnomAD database, including 31 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00074 ( 1 hom., cov: 33)

Exomes 𝑓: 0.0015 ( 30 hom. )

Consequence

CHIT1
NM_003465.3 3_prime_UTR

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -2.25

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 made for transcript

Verdict is Benign. Variant got -9 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.9).

BS1

Variant frequency is greater than expected in population eas. gnomad4_exome allele frequency = 0.00154 (2188/1423686) while in subpopulation EAS AF= 0.0289 (1142/39490). AF 95% confidence interval is 0.0275. There are 30 homozygotes in gnomad4_exome. There are 1295 alleles in male gnomad4_exome subpopulation. Median coverage is 27. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High Homozygotes in GnomAdExome4 at 30 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHIT1	NM_003465.3 linkuse as main transcript	c.*85G>A		3_prime_UTR_variant	11/11	ENST00000367229.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHIT1	ENST00000367229.6 linkuse as main transcript	c.*85G>A		3_prime_UTR_variant	11/11	1	NM_003465.3	P1	Q13231-1

Frequencies

GnomAD3 genomes

AF:

0.000742

AC:

113

AN:

152212

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:

0.0137

Gnomad SAS

AF:

0.00786

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00263

AC:

647

AN:

245888

Hom.:

AF XY:

0.00300

AC XY:

402

AN XY:

134016

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000581

Gnomad ASJ exome

AF:

0.000100

Gnomad EAS exome

AF:

0.0143

Gnomad SAS exome

AF:

0.0119

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000990

Gnomad OTH exome

AF:

0.00167

GnomAD4 exome

AF:

0.00154

AC:

2188

AN:

1423686

Hom.:

Cov.:

AF XY:

0.00182

AC XY:

1295

AN XY:

710204

show subpopulations

Gnomad4 AFR exome

AF:

0.0000307

Gnomad4 AMR exome

AF:

0.0000448

Gnomad4 ASJ exome

AF:

0.0000386

Gnomad4 EAS exome

AF:

0.0289

Gnomad4 SAS exome

AF:

0.0101

Gnomad4 FIN exome

AF:

0.0000191

Gnomad4 NFE exome

AF:

0.000106

Gnomad4 OTH exome

AF:

0.00120

GnomAD4 genome

AF:

0.000742

AC:

113

AN:

152330

Hom.:

Cov.:

AF XY:

0.000980

AC XY:

AN XY:

74482

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.0137

Gnomad4 SAS

AF:

0.00786

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000203

Hom.:

Bravo

AF:

0.000510

Asia WGS

AF:

0.00953

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Chitotriosidase deficiency

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.90

CADD

Benign

1.3

DANN

Benign

0.36

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