chr11-2884014-C-T

Position:

• chr11-2884014-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_001122630.2(CDKN1C):​c.908G>A​(p.Arg303Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: CDKN1C NM_001122630.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.06

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a region_of_interest Disordered (size 38) in uniprot entity CDN1C_HUMAN there are 4 pathogenic changes around while only 1 benign (80%) in NM_001122630.2
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CDKN1C	NM_001122630.2	c.908G>A	p.Arg303Lys	missense_variant	3/4	ENST00000440480.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CDKN1C	ENST00000440480.8	c.908G>A	p.Arg303Lys	missense_variant	3/4	1	NM_001122630.2	A2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Beckwith-Wiedemann syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 05, 2023

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on CDKN1C protein function. ClinVar contains an entry for this variant (Variation ID: 957828). This variant has not been reported in the literature in individuals affected with CDKN1C-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces arginine, which is basic and polar, with lysine, which is basic and polar, at codon 314 of the CDKN1C protein (p.Arg314Lys). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.79
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.020
CADD	Uncertain	25
DANN	Benign	0.96
DEOGEN2	Benign	0.0042	T;.
Eigen	Uncertain	0.38
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Uncertain	0.83	D
LIST_S2	Benign	0.52	.;T
M_CAP	Pathogenic	0.96	D
MetaRNN	Uncertain	0.43	T;T
MetaSVM	Uncertain	0.46	D
MutationTaster	Benign	0.98	N;N;N;N;N
PROVEAN	Benign	0.29	N;.
REVEL	Uncertain	0.33
Sift	Pathogenic	0.0	D;.
Sift4G	Benign	0.46	T;.
Polyphen		0.58	P;.
Vest4		0.18
MutPred		0.15		Gain of phosphorylation at G126 (P = 0.0066);Gain of phosphorylation at G126 (P = 0.0066);
MVP		0.66
ClinPred		0.74	D
GERP RS		3.5

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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

Other links and lift over

dbSNP: rs1015057194; hg19: chr11-2905244;