rs556682082

Variant names:

• chr11-2884755-C-A
• rs556682082
• NM_001122630.2:c.702G>T
• CDKN1C p.Gly234Gly

Your query was ambiguous. Multiple possible variants found:

• chr11-2884755-C-A
• chr11-2884755-C-T

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_001122630.2(CDKN1C):​c.702G>T​(p.Gly234Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000735 in 1,359,638 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 (no stars). Synonymous variant affecting the same amino acid position (i.e. G234G) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.4e-7 (0 hom.)
• Consequence: CDKN1C NM_001122630.2 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.137
• 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: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• IMAGe syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Illumina, Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P, Orphanet
• 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: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.36).
• BP7: Synonymous conserved (PhyloP=-0.137 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001122630.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CDKN1C	NM_001122630.2	MANE Select	c.702G>T	p.Gly234Gly	synonymous	Exon 2 of 4	NP_001116102.1	P49918-2
	CDKN1C	NM_000076.2		c.735G>T	p.Gly245Gly	synonymous	Exon 1 of 3	NP_000067.1	P49918-1
	CDKN1C	NM_001362474.2		c.735G>T	p.Gly245Gly	synonymous	Exon 1 of 3	NP_001349403.1	P49918-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CDKN1C	ENST00000440480.8	TSL:1 MANE Select	c.702G>T	p.Gly234Gly	synonymous	Exon 2 of 4	ENSP00000411257.2	P49918-2
	CDKN1C	ENST00000414822.8	TSL:1	c.735G>T	p.Gly245Gly	synonymous	Exon 1 of 3	ENSP00000413720.3	P49918-1
	CDKN1C	ENST00000430149.3	TSL:1	c.735G>T	p.Gly245Gly	synonymous	Exon 1 of 3	ENSP00000411552.2	P49918-1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.35e-7 AC: 1 AN: 1359638 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 676464

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 28058

American (AMR) AF: 0.00 AC: 0 AN: 36256

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23340

East Asian (EAS) AF: 0.00 AC: 0 AN: 31136

South Asian (SAS) AF: 0.00 AC: 0 AN: 79306

European-Finnish (FIN) AF: 0.0000281 AC: 1 AN: 35598

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5180

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1065458

Other (OTH) AF: 0.00 AC: 0 AN: 55306

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.36
CADD	Benign	12
DANN	Benign	0.97
PhyloP100		-0.14
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs556682082;

hg19: chr11-2905985;