10-102918568-C-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 0P and 3B. BP4_ModerateBS1_Supporting

The NM_017649.5(CNNM2):c.88C>T(p.Arg30Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000309 in 1,584,730 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 Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. R30R) has been classified as Benign.

Frequency

Genomes: 𝑓 0.00019 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

CNNM2
NM_017649.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 1.40

Publications

0 publications found

Variant links:

Genes affected

CNNM2 (HGNC:103): (cyclin and CBS domain divalent metal cation transport mediator 2) This gene encodes a member of the ancient conserved domain containing protein family. Members of this protein family contain a cyclin box motif and have structural similarity to the cyclins. The encoded protein may play an important role in magnesium homeostasis by mediating the epithelial transport and renal reabsorption of Mg2+. Mutations in this gene are associated with renal hypomagnesemia. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Dec 2011]

CNNM2 Gene-Disease associations (from GenCC):

hypomagnesemia, seizures, and intellectual disability 1
Inheritance: AR, SD, AD Classification: DEFINITIVE, STRONG Submitted by: G2P, ClinGen, Illumina, Labcorp Genetics (formerly Invitae)
renal hypomagnesemia 6
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
familial primary hypomagnesemia with normocalciuria and normocalcemia
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

CNNM2 links:

ENSG00000286575 (HGNC:):

ENSG00000286575 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.117658675).

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00019 (29/152244) while in subpopulation AFR AF = 0.000577 (24/41566). AF 95% confidence interval is 0.000398. There are 0 homozygotes in GnomAd4. There are 16 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CNNM2	NM_017649.5 link	c.88C>T	p.Arg30Cys	missense_variant	Exon 1 of 8	ENST00000369878.9	NP_060119.3	Q9H8M5-1
CNNM2	NM_199076.3 link	c.88C>T	p.Arg30Cys	missense_variant	Exon 1 of 7		NP_951058.1	Q9H8M5-2
CNNM2	NM_199077.3 link	c.88C>T	p.Arg30Cys	missense_variant	Exon 1 of 2		NP_951059.1	Q9H8M5-3
LOC107984265	NR_160733.1 link	n.-233G>A		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CNNM2	ENST00000369878.9 link	c.88C>T	p.Arg30Cys	missense_variant	Exon 1 of 8	1	NM_017649.5	ENSP00000358894.3	Q9H8M5-1
CNNM2	ENST00000369875.3 link	c.88C>T	p.Arg30Cys	missense_variant	Exon 1 of 2	1		ENSP00000358891.3	Q9H8M5-3
CNNM2	ENST00000433628.2 link	c.88C>T	p.Arg30Cys	missense_variant	Exon 1 of 7	2		ENSP00000392875.2	Q9H8M5-2
ENSG00000286575	ENST00000652934.1 link	n.-233G>A		upstream_gene_variant

Frequencies

GnomAD3 genomes

AF:

0.000184

AC:

AN:

152126

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000555

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000196

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:

0.0000147

Gnomad OTH

AF:

0.000480

GnomAD2 exomes

AF:

0.0000208

AC:

AN:

191892

AF XY:

0.0000280

show subpopulations

Gnomad AFR exome

AF:

0.000375

Gnomad AMR exome

AF:

0.0000343

Gnomad ASJ exome

AF:

0.00

Gnomad EAS 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:

0.0000140

AC:

AN:

1432486

Hom.:

Cov.:

AF XY:

0.0000141

AC XY:

AN XY:

711482

show subpopulations

African (AFR)

AF:

0.000456

AC:

AN:

30684

American (AMR)

AF:

0.0000487

AC:

AN:

41042

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25162

East Asian (EAS)

AF:

0.00

AC:

AN:

37158

South Asian (SAS)

AF:

0.00

AC:

AN:

83000

European-Finnish (FIN)

AF:

0.00

AC:

AN:

49338

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5388

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1101572

Other (OTH)

AF:

0.0000676

AC:

AN:

59142

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.532

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.000190

AC:

AN:

152244

Hom.:

Cov.:

AF XY:

0.000215

AC XY:

AN XY:

74442

show subpopulations

African (AFR)

AF:

0.000577

AC:

AN:

41566

American (AMR)

AF:

0.000196

AC:

AN:

15300

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10604

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

67994

Other (OTH)

AF:

0.000475

AC:

AN:

2106

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.518

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.000155

Hom.:

Bravo

AF:

0.000223

ExAC

AF:

0.0000171

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Mar 19, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.88C>T (p.R30C) alteration is located in exon 1 (coding exon 1) of the CNNM2 gene. This alteration results from a C to T substitution at nucleotide position 88, causing the arginine (R) at amino acid position 30 to be replaced by a cysteine (C). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Renal hypomagnesemia 6;C4225333:Hypomagnesemia, seizures, and intellectual disability 1

Uncertain:1

Jun 06, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Uncertain:1

Feb 15, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces arginine, which is basic and polar, with cysteine, which is neutral and slightly polar, at codon 30 of the CNNM2 protein (p.Arg30Cys). This variant is present in population databases (rs540558653, gnomAD 0.04%). This variant has not been reported in the literature in individuals affected with CNNM2-related conditions. ClinVar contains an entry for this variant (Variation ID: 2178214). 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 disruptive. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.40

BayesDel_addAF

Benign

-0.072

BayesDel_noAF

Uncertain

-0.030

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.018

T;.;.

Eigen

Uncertain

0.24

Eigen_PC

Uncertain

0.33

FATHMM_MKL

Benign

0.11

LIST_S2

Uncertain

0.89

D;D;D

M_CAP

Pathogenic

1.0

MetaRNN

Benign

0.12

T;T;T

MetaSVM

Benign

-0.48

MutationAssessor

Benign

0.0

N;N;N

PhyloP100

1.4

PrimateAI

Pathogenic

0.95

PROVEAN

Benign

-0.47

N;N;N

REVEL

Uncertain

0.30

Sift

Uncertain

0.0020

D;D;D

Sift4G

Uncertain

0.041

D;D;D

Polyphen

0.99

D;.;D

Vest4

0.24

MutPred

0.31

Gain of catalytic residue at S32 (P = 0.0267);Gain of catalytic residue at S32 (P = 0.0267);Gain of catalytic residue at S32 (P = 0.0267);

MVP

0.093

ClinPred

0.24

GERP RS

5.0

PromoterAI

-0.13

Neutral

(source)

Varity_R

0.17

gMVP

0.50

Mutation Taster

=85/15

polymorphism

(source)

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

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10-102918568-C-T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over