Genetic Variant ITPR1:p.Thr2662Thr (chr3-4818200-C-T) – ACMG Classification: Benign (-17 pts)

Variant summary

Our verdict is Benign. The variant received -17 ACMG points: 0P and 17B. BP4_StrongBP6_Very_StrongBP7BS1

The NM_001378452.1(ITPR1):c.7986C>T(p.Thr2662Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000135 in 1,592,536 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.00028 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00012 ( 0 hom. )

Consequence

ITPR1
NM_001378452.1 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:4

Conservation

PhyloP100: -2.80

Publications

1 publications found

Variant links:

Genes affected

ITPR1 (HGNC:6180): (inositol 1,4,5-trisphosphate receptor type 1) This gene encodes an intracellular receptor for inositol 1,4,5-trisphosphate. Upon stimulation by inositol 1,4,5-trisphosphate, this receptor mediates calcium release from the endoplasmic reticulum. Mutations in this gene cause spinocerebellar ataxia type 15, a disease associated with an heterogeneous group of cerebellar disorders. Multiple transcript variants have been identified for this gene. [provided by RefSeq, Nov 2009]

ITPR1 Gene-Disease associations (from GenCC):

aniridia-cerebellar ataxia-intellectual disability syndrome
Inheritance: AD, AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, G2P, Genomics England PanelApp, PanelApp Australia, Labcorp Genetics (formerly Invitae), Orphanet, ClinGen
spinocerebellar ataxia type 29
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, ClinGen, Orphanet
spinocerebellar ataxia type 15/16
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)

ITPR1 links:

ENSG00000235978 (HGNC:):

ENSG00000235978 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -17 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.74).

BP6

Variant 3-4818200-C-T is Benign according to our data. Variant chr3-4818200-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 447604.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-2.8 with no splicing effect.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000282 (43/152258) while in subpopulation AFR AF = 0.000698 (29/41548). AF 95% confidence interval is 0.000498. There are 0 homozygotes in GnomAd4. There are 24 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001378452.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
ITPR1	NM_001378452.1	MANE Select	c.7986C>T	p.Thr2662Thr	synonymous	Exon 60 of 62	NP_001365381.1
ITPR1	NM_001168272.2		c.7941C>T	p.Thr2647Thr	synonymous	Exon 59 of 61	NP_001161744.1
ITPR1	NM_001099952.4		c.7842C>T	p.Thr2614Thr	synonymous	Exon 57 of 59	NP_001093422.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
ITPR1	ENST00000649015.2	MANE Select	c.7986C>T	p.Thr2662Thr	synonymous	Exon 60 of 62	ENSP00000497605.1
ITPR1	ENST00000354582.12	TSL:5	c.7962C>T	p.Thr2654Thr	synonymous	Exon 60 of 62	ENSP00000346595.8
ITPR1	ENST00000648266.1		c.7959C>T	p.Thr2653Thr	synonymous	Exon 60 of 62	ENSP00000498014.1

Frequencies

GnomAD3 genomes

AF:

0.000269

AC:

AN:

152140

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000652

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000327

Gnomad ASJ

AF:

0.00231

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.000229

AC:

AN:

248506

AF XY:

0.000178

show subpopulations

Gnomad AFR exome

AF:

0.00117

Gnomad AMR exome

AF:

0.000321

Gnomad ASJ exome

AF:

0.00189

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000621

Gnomad OTH exome

AF:

0.000332

GnomAD4 exome

AF:

0.000119

AC:

172

AN:

1440278

Hom.:

Cov.:

AF XY:

0.000132

AC XY:

AN XY:

714010

show subpopulations

African (AFR)

AF:

0.000963

AC:

AN:

33226

American (AMR)

AF:

0.000360

AC:

AN:

44478

Ashkenazi Jewish (ASJ)

AF:

0.00132

AC:

AN:

25696

East Asian (EAS)

AF:

0.00

AC:

AN:

39300

South Asian (SAS)

AF:

0.00

AC:

AN:

84672

European-Finnish (FIN)

AF:

0.0000189

AC:

AN:

52846

Middle Eastern (MID)

AF:

0.000530

AC:

AN:

5660

European-Non Finnish (NFE)

AF:

0.0000557

AC:

AN:

1095188

Other (OTH)

AF:

0.000422

AC:

AN:

59212

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.470

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.000282

AC:

AN:

152258

Hom.:

Cov.:

AF XY:

0.000322

AC XY:

AN XY:

74448

show subpopulations

African (AFR)

AF:

0.000698

AC:

AN:

41548

American (AMR)

AF:

0.000327

AC:

AN:

15290

Ashkenazi Jewish (ASJ)

AF:

0.00231

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.00

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10612

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68016

Other (OTH)

AF:

0.000473

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.492

Heterozygous variant carriers

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:

0.000278

Hom.:

Bravo

AF:

0.000400

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

Oct 27, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Sep 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

ITPR1: BP4, BP7

not specified

Benign:1

Nov 03, 2016

Athena Diagnostics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Autosomal dominant cerebellar ataxia

Benign:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease.

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.74

CADD

Benign

0.34

(source)

DANN

Benign

0.84

PhyloP100

-2.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Mutation Taster

=82/18

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

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over