chr11-2884745-G-A

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_001122630.2(CDKN1C):c.712C>T(p.Arg238Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000294 in 1,358,508 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. R238R) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000029 ( 0 hom. )

Consequence

CDKN1C
NM_001122630.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.131

Publications

2 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: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.31812635).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDKN1C	NM_001122630.2 link	c.712C>T	p.Arg238Cys	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.712C>T	p.Arg238Cys	missense_variant	Exon 2 of 4	1	NM_001122630.2	ENSP00000411257.2		P49918-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.0000184

AC:

AN:

163124

AF XY:

0.0000107

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000772

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000133

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000294

AC:

AN:

1358508

Hom.:

Cov.:

AF XY:

0.00000296

AC XY:

AN XY:

675890

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

27958

American (AMR)

AF:

0.0000838

AC:

AN:

35788

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23350

East Asian (EAS)

AF:

0.00

AC:

AN:

31134

South Asian (SAS)

AF:

0.00

AC:

AN:

79106

European-Finnish (FIN)

AF:

0.00

AC:

AN:

35548

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5172

European-Non Finnish (NFE)

AF:

9.39e-7

AC:

AN:

1065182

Other (OTH)

AF:

0.00

AC:

AN:

55270

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

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

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Jun 27, 2022

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.745C>T (p.R249C) alteration is located in exon 1 (coding exon 1) of the CDKN1C gene. This alteration results from a C to T substitution at nucleotide position 745, causing the arginine (R) at amino acid position 249 to be replaced by a cysteine (C). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Beckwith-Wiedemann syndrome

Uncertain:1

Jan 06, 2025

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 249 of the CDKN1C protein (p.Arg249Cys). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with CDKN1C-related conditions. ClinVar contains an entry for this variant (Variation ID: 236974). 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.67

BayesDel_addAF

Uncertain

0.081

BayesDel_noAF

Benign

-0.12

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.076

T;T;.

Eigen

Benign

0.11

Eigen_PC

Benign

0.015

FATHMM_MKL

Benign

0.71

LIST_S2

Benign

0.71

.;T;T

M_CAP

Pathogenic

0.95

MetaRNN

Benign

0.32

T;T;T

MetaSVM

Uncertain

0.44

MutationAssessor

Benign

0.55

N;N;.

PhyloP100

0.13

PrimateAI

Pathogenic

0.87

PROVEAN

Benign

-1.6

N;N;N

REVEL

Uncertain

0.51

Sift

Pathogenic

0.0

D;D;D

Sift4G

Uncertain

0.027

D;D;D

Polyphen

1.0

D;D;.

Vest4

0.14

MutPred

0.30

Loss of phosphorylation at S247 (P = 0.0887);Loss of phosphorylation at S247 (P = 0.0887);.;

MVP

0.52

MPC

1.7

ClinPred

0.48

GERP RS

1.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.25

gMVP

0.18

Mutation Taster

=82/18

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