chr12-57749222-A-G

Position:

• chr12-57749222-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_000075.4(CDK4):​c.779T>C​(p.Val260Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V260E) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CDK4 NM_000075.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.78

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

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.27335083).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CDK4	NM_000075.4	c.779T>C	p.Val260Ala	missense_variant	7/8	ENST00000257904.11
TSPAN31	NM_005981.5	c.*1932A>G		3_prime_UTR_variant	6/6	ENST00000257910.8
TSPAN31	NM_001330168.2	c.*1932A>G		3_prime_UTR_variant	4/4
TSPAN31	NM_001330169.2	c.*1932A>G		3_prime_UTR_variant	6/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CDK4	ENST00000257904.11	c.779T>C	p.Val260Ala	missense_variant	7/8	1	NM_000075.4	P1
TSPAN31	ENST00000257910.8	c.*1932A>G		3_prime_UTR_variant	6/6	1	NM_005981.5	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 05, 2023

The p.V260A variant (also known as c.779T>C), located in coding exon 6 of the CDK4 gene, results from a T to C substitution at nucleotide position 779. The valine at codon 260 is replaced by alanine, an amino acid with similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Uncertain	0.019	T
BayesDel_noAF	Benign	-0.21
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.47	T;.;T
Eigen	Benign	-0.16
Eigen_PC	Benign	0.0081
FATHMM_MKL	Uncertain	0.82	D
LIST_S2	Benign	0.67	T;T;T
M_CAP	Benign	0.025	D
MetaRNN	Benign	0.25	T;T;T
MetaSVM	Benign	-0.75	T
MutationAssessor	Benign	0.97	L;.;.
MutationTaster	Benign	0.64	D;D;D;D;D
PrimateAI	Uncertain	0.77	T
PROVEAN	Uncertain	-2.4	N;N;N
REVEL	Benign	0.087
Sift	Benign	0.12	T;T;D
Sift4G	Benign	0.21	T;T;.
Polyphen		0.0090	B;.;.
Vest4		0.31
MutPred		0.47		Loss of catalytic residue at V260 (P = 0.0316);.;.;
MVP		0.86
MPC		0.75
ClinPred		0.58	D
GERP RS		4.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.37
gMVP		0.52

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr12-58143005;