Genetic Variant CDKN1C:p.Ser276* (chr11-2884095-G-T) – ACMG Classification: Pathogenic (10 pts)

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1PM2

The NM_001122630.2(CDKN1C):c.827C>A(p.Ser276*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000072 in 1,388,074 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. S276S) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 7.2e-7 ( 0 hom. )

Consequence

CDKN1C
NM_001122630.2 stop_gained

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.47

Publications

0 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:

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ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 10 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDKN1C	NM_001122630.2 link	c.827C>A	p.Ser276*	stop_gained	Exon 3 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.827C>A	p.Ser276*	stop_gained	Exon 3 of 4	1	NM_001122630.2	ENSP00000411257.2		P49918-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.20e-7

AC:

AN:

1388074

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

684456

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

30226

American (AMR)

AF:

0.00

AC:

AN:

35432

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24886

East Asian (EAS)

AF:

0.00

AC:

AN:

35238

South Asian (SAS)

AF:

0.00

AC:

AN:

78626

European-Finnish (FIN)

AF:

0.00

AC:

AN:

46336

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4548

European-Non Finnish (NFE)

AF:

9.30e-7

AC:

AN:

1075368

Other (OTH)

AF:

0.00

AC:

AN:

57414

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

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.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.22

BayesDel_addAF

Pathogenic

0.58

BayesDel_noAF

Uncertain

0.010

CADD

Pathogenic

(source)

DANN

Benign

0.95

DEOGEN2

Benign

0.014

T;.

Eigen

Benign

0.11

Eigen_PC

Benign

-0.27

FATHMM_MKL

Benign

0.22

LIST_S2

Benign

0.46

.;T

MetaRNN

Benign

0.21

T;T

MetaSVM

Benign

-0.97

PhyloP100

2.5

PROVEAN

Benign

-0.59

N;.

REVEL

Benign

0.23

Sift

Benign

0.11

T;.

Sift4G

Benign

0.22

T;.

Polyphen

0.97

D;.

Vest4

0.34

MutPred

0.30

Gain of phosphorylation at R99 (P = 0.0031);Gain of phosphorylation at R99 (P = 0.0031);

MVP

0.73

ClinPred

0.54

GERP RS

2.2

Mutation Taster

=29/171

disease causing (fs/PTC)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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

Computational scores

Splicing

Publications

Other links and lift over