NM_000388.4:c.1444T>G

Variant names:

• chr3-122275878-T-G
• rs774174934
• NM_000388.4:c.1444T>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_000388.4(CASR):​c.1444T>G​(p.Cys482Gly) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C482R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CASR NM_000388.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.98
• Publications: 0 publications found

Genes affected

CASR (HGNC:1514): (calcium sensing receptor) The protein encoded by this gene is a plasma membrane G protein-coupled receptor that senses small changes in circulating calcium concentration. The encoded protein couples this information to intracellular signaling pathways that modify parathyroid hormone secretion or renal cation handling, and thus this protein plays an essential role in maintaining mineral ion homeostasis. Mutations in this gene are a cause of familial hypocalciuric hypercalcemia, neonatal severe hyperparathyroidism, and autosomal dominant hypocalcemia. [provided by RefSeq, Aug 2017]

CASR Gene-Disease associations (from GenCC):

• autosomal dominant hypocalcemia 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Illumina, ClinGen, Labcorp Genetics (formerly Invitae)
• familial hypocalciuric hypercalcemia 1

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Illumina, Orphanet, Genomics England PanelApp
• neonatal severe primary hyperparathyroidism

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen, Labcorp Genetics (formerly Invitae)
• autosomal dominant hypocalcemia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• epilepsy, idiopathic generalized, susceptibility to, 8

  Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
• epilepsy

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the CASR gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 114 curated pathogenic missense variants (we use a threshold of 10). The gene has 10 curated benign missense variants. Gene score misZ: 3.1237 (above the threshold of 3.09). Trascript score misZ: 4.8257 (above the threshold of 3.09). GenCC associations: The gene is linked to neonatal severe primary hyperparathyroidism, autosomal dominant hypocalcemia 1, familial hypocalciuric hypercalcemia 1, epilepsy, autosomal dominant hypocalcemia, epilepsy, idiopathic generalized, susceptibility to, 8.
• BP4: Computational evidence support a benign effect (MetaRNN=0.28306007).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CASR	NM_000388.4	c.1444T>G	p.Cys482Gly	missense_variant	Exon 5 of 7	ENST00000639785.2	NP_000379.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CASR	ENST00000639785.2	c.1444T>G	p.Cys482Gly	missense_variant	Exon 5 of 7	1	NM_000388.4	ENSP00000491584.2
CASR	ENST00000498619.4	c.1444T>G	p.Cys482Gly	missense_variant	Exon 5 of 7	1		ENSP00000420194.1
CASR	ENST00000638421.1	c.1444T>G	p.Cys482Gly	missense_variant	Exon 5 of 7	5		ENSP00000492190.1
CASR	ENST00000490131.7	c.1378-6235T>G		intron_variant	Intron 3 of 4	5		ENSP00000418685.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Nephrolithiasis/nephrocalcinosis Uncertain:1

Dec 04, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.C482G variant (also known as c.1444T>G), located in coding exon 4 of the CASR gene, results from a T to G substitution at nucleotide position 1444. The cysteine at codon 482 is replaced by glycine, an amino acid with highly dissimilar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.085
BayesDel_addAF	Benign	-0.042	T
BayesDel_noAF	Benign	-0.30
CADD	Benign	21
DANN	Benign	0.95
DEOGEN2	Benign	0.32	T;T;.
Eigen	Benign	-0.24
Eigen_PC	Benign	0.056
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Benign	0.69	.;T;T
M_CAP	Benign	0.031	D
MetaRNN	Benign	0.28	T;T;T
MetaSVM	Benign	-0.58	T
MutationAssessor	Benign	-1.7	N;N;N
PhyloP100		4.0
PrimateAI	Benign	0.41	T
PROVEAN	Benign	1.4	.;.;N
REVEL	Benign	0.27
Sift	Benign	0.099	.;.;T
Sift4G	Benign	0.084	.;.;T
Polyphen		0.0	B;B;.
Vest4		0.31
MutPred		0.47		Gain of disorder (P = 0.0037);Gain of disorder (P = 0.0037);Gain of disorder (P = 0.0037);
MVP		0.82
MPC		0.75
ClinPred		0.67	D
GERP RS		5.7
Varity_R		0.36
gMVP		0.48
Mutation Taster		=68/32	polymorphism

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

Other links and lift over

dbSNP: rs774174934; hg19: chr3-121994725;