chr12-57747747-C-CTT

Variant names:

• chr12-57747747-C-CTT
• rs146863045
• NM_000075.4:c.*776_*777dupAA

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BS2

The NM_000075.4(CDK4):​c.*776_*777dupAA variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000859 in 151,408 control chromosomes in the GnomAD database, including 1 homozygotes. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.000061 (1 hom., cov: 31)
  • Exomes 𝑓: 0.00081 (0 hom.)
• Consequence: CDK4 NM_000075.4 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.674
• Publications: 0 publications found

Genes affected

CDK4 (HGNC:1773): (cyclin dependent kinase 4) The protein encoded by this gene is a member of the Ser/Thr protein kinase family. This protein is highly similar to the gene products of S. cerevisiae cdc28 and S. pombe cdc2. It is a catalytic subunit of the protein kinase complex that is important for cell cycle G1 phase progression. The activity of this kinase is restricted to the G1-S phase, which is controlled by the regulatory subunits D-type cyclins and CDK inhibitor p16(INK4a). This kinase was shown to be responsible for the phosphorylation of retinoblastoma gene product (Rb). Mutations in this gene as well as in its related proteins including D-type cyclins, p16(INK4a) and Rb were all found to be associated with tumorigenesis of a variety of cancers. Multiple polyadenylation sites of this gene have been reported. [provided by RefSeq, Jul 2008]

TSPAN31 (HGNC:10539): (tetraspanin 31) The protein encoded by this gene is a member of the transmembrane 4 superfamily, also known as the tetraspanin family. Most of these members are cell-surface proteins that are characterized by the presence of four hydrophobic domains. The proteins mediate signal transduction events that play a role in the regulation of cell development, activation, growth and motility. This encoded protein is thought to be involved in growth-related cellular processes. This gene is associated with tumorigenesis and osteosarcoma. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BS2: High AC in GnomAd4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDK4	NM_000075.4	c.*776_*777dupAA		3_prime_UTR_variant	Exon 8 of 8	ENST00000257904.11	NP_000066.1
TSPAN31	NM_005981.5	c.*469_*470dupTT		3_prime_UTR_variant	Exon 6 of 6	ENST00000257910.8	NP_005972.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDK4	ENST00000257904.11	c.*776_*777dupAA		3_prime_UTR_variant	Exon 8 of 8	1	NM_000075.4	ENSP00000257904.5
TSPAN31	ENST00000257910.8	c.*469_*470dupTT		3_prime_UTR_variant	Exon 6 of 6	1	NM_005981.5	ENSP00000257910.3

Frequencies

GnomAD3 genomes AF: 0.00000683 AC: 1 AN: 146448 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000682

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.000815 AC: 4 AN: 4908 Hom.: 0 Cov.: 0 AF XY: 0.00125 AC XY: 3 AN XY: 2400

⚠️ 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: 78

American (AMR) AF: 0.00 AC: 0 AN: 396

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 240

East Asian (EAS) AF: 0.00 AC: 0 AN: 632

South Asian (SAS) AF: 0.00427 AC: 1 AN: 234

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 16

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 26

European-Non Finnish (NFE) AF: 0.000994 AC: 3 AN: 3018

Other (OTH) AF: 0.00 AC: 0 AN: 268

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome AF: 0.0000614 AC: 9 AN: 146500 Hom.: 1 Cov.: 31 AF XY: 0.0000280 AC XY: 2 AN XY: 71354

African (AFR) AF: 0.00 AC: 0 AN: 40122

American (AMR) AF: 0.0000681 AC: 1 AN: 14676

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3390

East Asian (EAS) AF: 0.00 AC: 0 AN: 5050

South Asian (SAS) AF: 0.00 AC: 0 AN: 4612

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 9248

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 282

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 66234

Other (OTH) AF: 0.00402 AC: 8 AN: 1988

Alfa AF: 0.00 Hom.: 2

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.67
Mutation Taster		=100/0	polymorphism

Splicing

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

Other links and lift over

dbSNP: rs146863045; hg19: chr12-58141530;