rs61757106

chr3-4669693-C-Gchr3-4669693-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_001378452.1(ITPR1):c.1926C>G(p.Asn642Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,860 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. N642N) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: ITPR1 NM_001378452.1 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.45

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, ITPR1
• BP4: Computational evidence support a benign effect (MetaRNN=0.2026672).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ITPR1	NM_001378452.1	c.1926C>G	p.Asn642Lys	missense_variant	19/62	ENST00000649015.2
ITPR1	NM_001168272.2	c.1881C>G	p.Asn627Lys	missense_variant	18/61
ITPR1	NM_001099952.4	c.1926C>G	p.Asn642Lys	missense_variant	19/59
ITPR1	NM_002222.7	c.1881C>G	p.Asn627Lys	missense_variant	18/58

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ITPR1	ENST00000649015.2	c.1926C>G	p.Asn642Lys	missense_variant	19/62		NM_001378452.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000400 AC: 1 AN: 249812 Hom.: 0 AF XY: 0.00000739 AC XY: 1 AN XY: 135376

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000290

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460860 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 726740

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.49
BayesDel_addAF	Benign	-0.023	T
BayesDel_noAF	Benign	-0.19
Cadd	Benign	21
Dann	Benign	0.38
Eigen	Benign	-0.38
Eigen_PC	Benign	-0.17
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Uncertain	0.90	D;D;D;D;D;D;D;D;.
M_CAP	Benign	0.046	D
MetaRNN	Benign	0.20	T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	-0.17	T
MutationAssessor	Benign	0.17	N;.;.;.;.;.;N;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.88	D
PROVEAN	Benign	-0.47	N;N;N;N;.;.;.;.;N
REVEL	Benign	0.28
Sift	Benign	0.87	T;T;T;T;.;.;.;.;T
Sift4G	Benign	0.89	T;T;.;T;.;.;.;.;T
Polyphen		0.0030	.;.;.;.;.;.;B;.;.
Vest4		0.53
MutPred		0.62		Gain of catalytic residue at N642 (P = 0.0155);.;Gain of catalytic residue at N642 (P = 0.0155);.;Gain of catalytic residue at N642 (P = 0.0155);.;Gain of catalytic residue at N642 (P = 0.0155);.;.;
MVP		0.69
MPC		1.2
ClinPred		0.14	T
GERP RS		4.4
Varity_R		0.076
gMVP		0.82

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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

Other links and lift over

dbSNP: rs61757106; hg19: chr3-4711377;