Genetic Variant ITPR3:p.His721Gln (chr6-33669130-C-G) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_002224.4(ITPR3):c.2163C>G(p.His721Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,682 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Synonymous variant affecting the same amino acid position (i.e. H721H) has been classified as Benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

ITPR3
NM_002224.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -3.04

Publications

23 publications found

Variant links:

Genes affected

ITPR3 (HGNC:6182): (inositol 1,4,5-trisphosphate receptor type 3) This gene encodes a receptor for inositol 1,4,5-trisphosphate, a second messenger that mediates the release of intracellular calcium. The receptor contains a calcium channel at the C-terminus and the ligand-binding site at the N-terminus. Knockout studies in mice suggest that type 2 and type 3 inositol 1,4,5-trisphosphate receptors play a key role in exocrine secretion underlying energy metabolism and growth. [provided by RefSeq, Aug 2010]

ITPR3 Gene-Disease associations (from GenCC):

Charcot-Marie-Tooth disease, demyelinating, type 1J
Inheritance: AD Classification: DEFINITIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics

ITPR3 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ITPR3	NM_002224.4 link	c.2163C>G	p.His721Gln	missense_variant	Exon 18 of 58	ENST00000605930.3	NP_002215.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ITPR3	ENST00000605930.3 link	c.2163C>G	p.His721Gln	missense_variant	Exon 18 of 58	1	NM_002224.4	ENSP00000475177.1
ITPR3	ENST00000374316.9 link	c.2163C>G	p.His721Gln	missense_variant	Exon 19 of 59	5		ENSP00000363435.4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461682

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727146

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33476

American (AMR)

AF:

0.00

AC:

AN:

44704

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26126

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86232

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53358

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5742

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1111956

Other (OTH)

AF:

0.00

AC:

AN:

60388

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

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

Cov.:

Alfa

AF:

0.00

Hom.:

56526

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.43

BayesDel_addAF

Uncertain

0.10

BayesDel_noAF

Benign

-0.090

CADD

Benign

2.1

(source)

DANN

Benign

0.95

DEOGEN2

Benign

0.24

T;T

Eigen

Benign

-0.51

Eigen_PC

Benign

-0.46

FATHMM_MKL

Benign

0.38

LIST_S2

Benign

0.84

.;T

M_CAP

Benign

0.040

MetaRNN

Uncertain

0.47

T;T

MetaSVM

Benign

-0.69

MutationAssessor

Benign

1.0

L;L

PhyloP100

-3.0

PrimateAI

Pathogenic

0.87

PROVEAN

Benign

0.27

N;.

REVEL

Uncertain

0.53

Sift

Benign

0.23

T;.

Sift4G

Benign

0.23

T;T

Polyphen

0.36

B;B

Vest4

0.58

MutPred

0.21

Loss of catalytic residue at H721 (P = 0.0542);Loss of catalytic residue at H721 (P = 0.0542);

MVP

0.89

MPC

0.67

ClinPred

0.34

GERP RS

1.7

Varity_R

0.20

gMVP

0.19

Mutation Taster

=78/22

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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over