3-4645653-G-C

Variant names:

• chr3-4645653-G-C
• NM_001378452.1:c.780G>C
• ITPR1 p.Gln260His

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM1 PM2

The NM_001378452.1(ITPR1):​c.780G>C​(p.Gln260His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Q260K) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ITPR1 NM_001378452.1 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.46
• Publications: 0 publications found

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: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp, ClinGen, Orphanet
• spinocerebellar ataxia type 29

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae), ClinGen
• spinocerebellar ataxia type 15/16

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_001378452.1
• PM2: Very rare variant in population databases, with high coverage

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ITPR1	NM_001378452.1	MANE Select	c.780G>C	p.Gln260His	missense	Exon 10 of 62	NP_001365381.1	Q14643-1
	ITPR1	NM_001168272.2		c.780G>C	p.Gln260His	missense	Exon 10 of 61	NP_001161744.1	Q14643-2
	ITPR1	NM_001099952.4		c.780G>C	p.Gln260His	missense	Exon 10 of 59	NP_001093422.2	Q14643-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ITPR1	ENST00000649015.2	MANE Select	c.780G>C	p.Gln260His	missense	Exon 10 of 62	ENSP00000497605.1	Q14643-1
	ITPR1	ENST00000354582.12	TSL:5	c.780G>C	p.Gln260His	missense	Exon 10 of 62	ENSP00000346595.8	A0A3F2YNW8
	ITPR1	ENST00000648266.1		c.780G>C	p.Gln260His	missense	Exon 10 of 62	ENSP00000498014.1	A0A3B3IU04

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.31
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.030
CADD	Benign	21
DANN	Benign	0.68
DEOGEN2	Uncertain	0.73	D
Eigen	Benign	-0.086
Eigen_PC	Benign	-0.12
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.90	D
M_CAP	Benign	0.058	D
MetaRNN	Uncertain	0.61	D
MetaSVM	Uncertain	0.098	D
MutationAssessor	Benign	1.8	L
PhyloP100		3.5
PrimateAI	Pathogenic	0.84	D
PROVEAN	Benign	-2.2	N
REVEL	Pathogenic	0.66
Sift	Benign	0.46	T
Sift4G	Benign	0.54	T
Varity_R		0.16
gMVP		0.73
Mutation Taster		=26/74	disease causing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr3-4687337;