3-122285045-G-C

Position:

• chr3-122285045-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 5P and 2B. PM1 PM2 PP2 BP4_Moderate

The NM_000388.4(CASR):​c.3091G>C​(p.Gly1031Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CASR NM_000388.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.52

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM1: In a topological_domain Cytoplasmic (size 215) in uniprot entity CASR_HUMAN there are 14 pathogenic changes around while only 2 benign (88%) in NM_000388.4
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), CASR. . Gene score misZ 3.1237 (greater than the threshold 3.09). Trascript score misZ 4.8257 (greater than threshold 3.09). GenCC has associacion of gene with epilepsy, autosomal dominant hypocalcemia, familial hypocalciuric hypercalcemia 1, epilepsy, idiopathic generalized, susceptibility to, 8, neonatal severe primary hyperparathyroidism, autosomal dominant hypocalcemia 1.
• BP4: Computational evidence support a benign effect (MetaRNN=0.15855882).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CASR	NM_000388.4	c.3091G>C	p.Gly1031Arg	missense_variant	7/7	ENST00000639785.2	NP_000379.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CASR	ENST00000639785.2	c.3091G>C	p.Gly1031Arg	missense_variant	7/7	1	NM_000388.4	ENSP00000491584.2
CASR	ENST00000498619.4	c.3121G>C	p.Gly1041Arg	missense_variant	7/7	1		ENSP00000420194.1
CASR	ENST00000638421.1	c.3091G>C	p.Gly1031Arg	missense_variant	7/7	5		ENSP00000492190.1
CASR	ENST00000490131.7	c.2860G>C	p.Gly954Arg	missense_variant	5/5	5		ENSP00000418685.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 37

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.085
BayesDel_addAF	Benign	-0.011	T
BayesDel_noAF	Benign	-0.25
CADD	Benign	19
DANN	Benign	0.94
DEOGEN2	Benign	0.35	T;T;.;.
Eigen	Benign	-0.48
Eigen_PC	Benign	-0.41
FATHMM_MKL	Benign	0.52	D
LIST_S2	Uncertain	0.87	.;D;D;D
M_CAP	Benign	0.073	D
MetaRNN	Benign	0.16	T;T;T;T
MetaSVM	Benign	-0.55	T
MutationAssessor	Benign	0.90	L;L;.;.
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-0.73	.;.;N;.
REVEL	Benign	0.16
Sift	Uncertain	0.0070	.;.;D;.
Sift4G	Uncertain	0.032	.;.;D;.
Polyphen		0.0	B;B;.;.
Vest4		0.18
MutPred		0.14		.;.;Loss of loop (P = 0.0374);.;
MVP		0.81
MPC		0.90
ClinPred		0.21	T
GERP RS		3.6
Varity_R		0.079
gMVP		0.32

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs142704083; hg19: chr3-122003892;