11-2884686-G-T

Variant names:

• chr11-2884686-G-T
• rs747104008
• NM_001122630.2:c.771C>A

Variant summary

Our verdict is Benign. The variant received -11 ACMG points: 0P and 11B. BP4_Strong BP6_Moderate BP7 BS2

The NM_001122630.2(CDKN1C):​c.771C>A​(p.Ser257Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000102 in 1,466,878 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 Likely benign (★). Synonymous variant affecting the same amino acid position (i.e. S257S) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 33)
  • Exomes 𝑓: 0.0000099 (0 hom.)
• Consequence: CDKN1C NM_001122630.2 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.816
• Publications: 0 publications found

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

ACMG classification

Our verdict: Benign. The variant received -11 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.56).
• BP6: Variant 11-2884686-G-T is Benign according to our data. Variant chr11-2884686-G-T is described in ClinVar as Likely_benign. ClinVar VariationId is 524752.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=0.816 with no splicing effect.
• BS2: High AC in GnomAdExome4 at 13 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDKN1C	NM_001122630.2	c.771C>A	p.Ser257Ser	synonymous_variant	Exon 2 of 4	ENST00000440480.8	NP_001116102.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDKN1C	ENST00000440480.8	c.771C>A	p.Ser257Ser	synonymous_variant	Exon 2 of 4	1	NM_001122630.2	ENSP00000411257.2

Frequencies

GnomAD3 genomes AF: 0.0000133 AC: 2 AN: 150284 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.0000297

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000150 AC: 2 AN: 133486 AF XY: 0.0000259

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000322

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000987 AC: 13 AN: 1316594 Hom.: 0 Cov.: 31 AF XY: 0.0000107 AC XY: 7 AN XY: 653288

African (AFR) AF: 0.00 AC: 0 AN: 26634

American (AMR) AF: 0.00 AC: 0 AN: 30470

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 21170

East Asian (EAS) AF: 0.00 AC: 0 AN: 30116

South Asian (SAS) AF: 0.00 AC: 0 AN: 73692

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 33598

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4472

European-Non Finnish (NFE) AF: 0.0000125 AC: 13 AN: 1043378

Other (OTH) AF: 0.00 AC: 0 AN: 53064

GnomAD4 genome AF: 0.0000133 AC: 2 AN: 150284 Hom.: 0 Cov.: 33 AF XY: 0.0000136 AC XY: 1 AN XY: 73378

African (AFR) AF: 0.00 AC: 0 AN: 40900

American (AMR) AF: 0.00 AC: 0 AN: 15118

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3448

East Asian (EAS) AF: 0.00 AC: 0 AN: 5048

South Asian (SAS) AF: 0.00 AC: 0 AN: 4766

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10316

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 308

European-Non Finnish (NFE) AF: 0.0000297 AC: 2 AN: 67412

Other (OTH) AF: 0.00 AC: 0 AN: 2070

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000151

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Beckwith-Wiedemann syndrome Benign:1

Sep 29, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.56
CADD	Benign	11
DANN	Benign	0.96
PhyloP100		0.82

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

Other links and lift over

dbSNP: rs747104008; hg19: chr11-2905916;