3-122284191-C-T

Position:

chr3-122284191-C-T

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 3P and 6B. PM1PP2BP4BP6BS1

The ENST00000639785.2(CASR):c.2237C>T(p.Ala746Val) variant causes a missense change. The variant allele was found at a frequency of 0.0000279 in 1,613,934 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A746T) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00019 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000011 ( 0 hom. )

Consequence

CASR
ENST00000639785.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 6.15

Variant links:

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM1

In a topological_domain Extracellular (size 23) in uniprot entity CASR_HUMAN there are 13 pathogenic changes around while only 3 benign (81%) in ENST00000639785.2

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=0.42059687).

BP6

Variant 3-122284191-C-T is Benign according to our data. Variant chr3-122284191-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 463921.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=2, Likely_benign=1}.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00019 (29/152292) while in subpopulation AFR AF= 0.000698 (29/41566). AF 95% confidence interval is 0.000498. There are 0 homozygotes in gnomad4. There are 14 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CASR	NM_000388.4 linkuse as main transcript	c.2237C>T	p.Ala746Val	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 linkuse as main transcript	c.2237C>T	p.Ala746Val	missense_variant	7/7	1	NM_000388.4	ENSP00000491584	P1	P41180-1
CASR	ENST00000498619.4 linkuse as main transcript	c.2267C>T	p.Ala756Val	missense_variant	7/7	1		ENSP00000420194		P41180-2
CASR	ENST00000638421.1 linkuse as main transcript	c.2237C>T	p.Ala746Val	missense_variant	7/7	5		ENSP00000492190	P1	P41180-1
CASR	ENST00000490131.7 linkuse as main transcript	c.2006C>T	p.Ala669Val	missense_variant	5/5	5		ENSP00000418685

Frequencies

GnomAD3 genomes

AF:

0.000191

AC:

AN:

152174

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000700

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000280

AC:

AN:

250410

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135556

show subpopulations

Gnomad AFR exome

AF:

0.000434

Gnomad AMR exome

AF:

0.00

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:

0.0000109

AC:

AN:

1461642

Hom.:

Cov.:

AF XY:

0.00000688

AC XY:

AN XY:

727140

show subpopulations

Gnomad4 AFR exome

AF:

0.000329

Gnomad4 AMR exome

AF:

0.00

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:

0.00000180

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.000190

AC:

AN:

152292

Hom.:

Cov.:

AF XY:

0.000188

AC XY:

AN XY:

74470

show subpopulations

Gnomad4 AFR

AF:

0.000698

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000132

Hom.:

Bravo

AF:

0.000227

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000494

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Sep 22, 2023

Variant summary: CASR c.2237C>T (p.Ala746Val) results in a non-conservative amino acid change located in the GPCR family 3, C-terminal domain (IPR017978) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 4.3e-05 in 281788 control chromosomes. The observed variant frequency is approximately 3.41 fold of the estimated maximal expected allele frequency for a pathogenic variant in CASR causing Familial Hypocalciuric Hypercalcemia phenotype (1.3e-05), suggesting that the variant is benign. c.2237C>T has been reported in the literature in at-least two individuals affected with Familial Hypocalciuric Hypercalcemia (example, Vargas-Poussou_2016, Hureaux_2019). These data indicate that the variant may be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 31189130, 31672324, 26963950, 34088669). Two submitters have cited clinical-significance assessments for this variant to ClinVar after 2014. One submitter classified the variant as likely benign, and one submitter classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as VUS-possibly benign. -

CASR-related disorder

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jun 27, 2024

The CASR c.2267C>T variant is predicted to result in the amino acid substitution p.Ala756Val. This variant, described as c.2237C>T (p.Ala746Val) in an alternate transcript (NM_000388.3), has been reported in at least one individual with familial hypocalciuric hypercalcemia (Table 1, Vargas-Poussou R et al. 2016. PubMed ID: 26963950; Supplementary Table S1, Hureaux M et al. 2019. PubMed ID: 31672324). This variant is reported in 0.048% of alleles in individuals of African descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Autosomal dominant hypocalcemia 1;C1809471:Familial hypocalciuric hypercalcemia

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 01, 2023

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 746 of the CASR protein (p.Ala746Val). This variant is present in population databases (rs139417576, gnomAD 0.05%). This missense change has been observed in individual(s) with familial hypocalciuric hypercalcemia (PMID: 26963950, 31672324). ClinVar contains an entry for this variant (Variation ID: 463921). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬†is likely to be tolerated. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Nephrolithiasis/nephrocalcinosis

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 23, 2023

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.22

BayesDel_addAF

Benign

-0.012

BayesDel_noAF

Uncertain

0.10

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.71

D;D;.;.

Eigen

Pathogenic

0.70

Eigen_PC

Pathogenic

0.68

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.95

.;D;D;D

M_CAP

Uncertain

0.23

MetaRNN

Benign

0.42

T;T;T;T

MetaSVM

Uncertain

0.58

MutationAssessor

Benign

1.3

L;L;.;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.69

PROVEAN

Benign

-2.1

.;.;N;.

REVEL

Pathogenic

0.65

Sift

Uncertain

0.028

.;.;D;.

Sift4G

Uncertain

0.035

.;.;D;.

Polyphen

1.0

D;D;.;.

Vest4

0.74

MVP

0.97

MPC

1.2

ClinPred

0.29

GERP RS

5.9

Varity_R

0.40

gMVP

0.80

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over