chr11-2884840-TCCGGGGCCGGGGCCGGGGCGGGGGCCGGGGCCGGGG-T

Variant names:

• chr11-2884840-TCCGGGGCCGGGGCCGGGGCGGGGGCCGGGGCCGGGG-T
• rs878853638
• NM_001122630.2:c.581_616delCCCCGGCCCCGGCCCCCGCCCCGGCCCCGGCCCCGG

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP3

The NM_001122630.2(CDKN1C):​c.581_616delCCCCGGCCCCGGCCCCCGCCCCGGCCCCGGCCCCGG​(p.Ala194_Pro205del) variant causes a disruptive inframe deletion change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. A194A) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CDKN1C NM_001122630.2 disruptive_inframe_deletion
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.949
• 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: Likely_benign. The variant received -1 ACMG points.

• BP3: Nonframeshift variant in repetitive region in NM_001122630.2

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDKN1C	NM_001122630.2	c.581_616delCCCCGGCCCCGGCCCCCGCCCCGGCCCCGGCCCCGG	p.Ala194_Pro205del	disruptive_inframe_deletion	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.581_616delCCCCGGCCCCGGCCCCCGCCCCGGCCCCGGCCCCGG	p.Ala194_Pro205del	disruptive_inframe_deletion	Exon 2 of 4	1	NM_001122630.2	ENSP00000411257.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 994084 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 475932

African (AFR) AF: 0.00 AC: 0 AN: 19300

American (AMR) AF: 0.00 AC: 0 AN: 6496

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 12022

East Asian (EAS) AF: 0.00 AC: 0 AN: 17794

South Asian (SAS) AF: 0.00 AC: 0 AN: 29910

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 14368

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2614

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 855054

Other (OTH) AF: 0.00 AC: 0 AN: 36526

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.95
Mutation Taster		=178/22	polymorphism

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs878853638; hg19: chr11-2906070;