11-2885126-C-T

Variant names:

Variant summary

Our verdict is Benign. The variant received -7 ACMG points: 0P and 7B. BP4_ModerateBS1_SupportingBS2

The NM_001122630.2(CDKN1C):c.331G>A(p.Ala111Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000177 in 1,471,548 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 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. A111S) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000018 ( 0 hom. )

Consequence

CDKN1C
NM_001122630.2 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 0.804

Publications

1 publications found

Variant links:

Genes affected

CDKN1C (HGNC:1786): (cyclin dependent kinase inhibitor 1C) This gene is imprinted, with preferential expression of the maternal allele. The encoded protein is a tight-binding, strong inhibitor of several G1 cyclin/Cdk complexes and a negative regulator of cell proliferation. Mutations in this gene are implicated in sporadic cancers and Beckwith-Wiedemann syndorome, suggesting that this gene is a tumor suppressor candidate. Three transcript variants encoding two different isoforms have been found for this gene. [provided by RefSeq, Oct 2010]

CDKN1C Gene-Disease associations (from GenCC):

Beckwith-Wiedemann syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
IMAGe syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Illumina, G2P, Ambry Genetics
rhabdomyosarcoma
Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
Beckwith-Wiedemann syndrome due to CDKN1C mutation
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
intrauterine growth restriction-short stature-early adult-onset diabetes syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Silver-Russell syndrome
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

CDKN1C links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -7 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.07490048).

BS1

Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.0000131 (2/152128) while in subpopulation EAS AF = 0.000388 (2/5154). AF 95% confidence interval is 0.0000686. There are 0 homozygotes in GnomAd4. There are 1 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAdExome4 at 24 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDKN1C	NM_001122630.2 link	c.331G>A	p.Ala111Thr	missense_variant	Exon 2 of 4	ENST00000440480.8	NP_001116102.1	P49918-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDKN1C	ENST00000440480.8 link	c.331G>A	p.Ala111Thr	missense_variant	Exon 2 of 4	1	NM_001122630.2	ENSP00000411257.2		P49918-2

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

152020

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000387

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

GnomAD2 exomes

AF:

0.0000661

AC:

AN:

75610

AF XY:

0.0000238

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000761

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000182

AC:

AN:

1319420

Hom.:

Cov.:

AF XY:

0.0000170

AC XY:

AN XY:

648370

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26854

American (AMR)

AF:

0.00

AC:

AN:

24672

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

20632

East Asian (EAS)

AF:

0.000696

AC:

AN:

33052

South Asian (SAS)

AF:

0.00

AC:

AN:

68082

European-Finnish (FIN)

AF:

0.00

AC:

AN:

32566

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4078

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1054618

Other (OTH)

AF:

0.0000182

AC:

AN:

54866

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.517

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152128

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74356

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41532

American (AMR)

AF:

0.00

AC:

AN:

15296

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.000388

AC:

AN:

5154

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10582

Middle Eastern (MID)

AF:

0.00

AC:

AN:

290

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67960

Other (OTH)

AF:

0.00

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Beckwith-Wiedemann syndrome;C1846009:IMAGe syndrome

Uncertain:1

Feb 07, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Beckwith-Wiedemann syndrome

Uncertain:1

Jan 12, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 122 of the CDKN1C protein (p.Ala122Thr). This variant is present in population databases (rs551863674, gnomAD 0.06%). This missense change has been observed in individual(s) with choroid plexus papilloma (PMID: 37204857). ClinVar contains an entry for this variant (Variation ID: 567058). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt CDKN1C protein function with a negative predictive value of 80%. 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. -

Inborn genetic diseases

Uncertain:1

Jul 30, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.364G>A (p.A122T) alteration is located in exon 1 (coding exon 1) of the CDKN1C gene. This alteration results from a G to A substitution at nucleotide position 364, causing the alanine (A) at amino acid position 122 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.088

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.47

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.048

T;T;.

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.012

LIST_S2

Benign

0.38

.;T;T

M_CAP

Pathogenic

0.91

MetaRNN

Benign

0.075

T;T;T

MetaSVM

Benign

-0.66

MutationAssessor

Benign

0.34

N;N;.

PhyloP100

0.80

PrimateAI

Uncertain

0.79

PROVEAN

Benign

-0.75

N;N;N

REVEL

Benign

0.16

Sift

Uncertain

0.021

D;D;D

Sift4G

Benign

0.063

T;T;T

Polyphen

0.0010

B;B;.

Vest4

0.048

MutPred

0.29

Gain of glycosylation at A122 (P = 0.0033);Gain of glycosylation at A122 (P = 0.0033);.;

MVP

0.42

MPC

1.3

ClinPred

0.031

GERP RS

0.88

Varity_R

0.072

gMVP

0.18

Mutation Taster

=92/8

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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over