4-127881859-A-G

Position:

• chr4-127881859-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_014264.5(PLK4):​c.59A>G​(p.Lys20Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PLK4 NM_014264.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.25

Genes affected

PLK4 (HGNC:11397): (polo like kinase 4) This gene encodes a member of the polo family of serine/threonine protein kinases. The protein localizes to centrioles, complex microtubule-based structures found in centrosomes, and regulates centriole duplication during the cell cycle. Three alternatively spliced transcript variants that encode different protein isoforms have been found for this gene. [provided by RefSeq, Jun 2010]

PLK4 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.764

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PLK4	NM_014264.5	c.59A>G	p.Lys20Arg	missense_variant	2/16	ENST00000270861.10	NP_055079.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PLK4	ENST00000270861.10	c.59A>G	p.Lys20Arg	missense_variant	2/16	1	NM_014264.5	ENSP00000270861.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 30, 2022

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. This variant has not been reported in the literature in individuals affected with PLK4-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces lysine, which is basic and polar, with arginine, which is basic and polar, at codon 20 of the PLK4 protein (p.Lys20Arg). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.21
BayesDel_addAF	Benign	0.0040	T
BayesDel_noAF	Benign	-0.23
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.15	T;T;.;T
Eigen	Uncertain	0.45
Eigen_PC	Uncertain	0.46
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.95	D;D;D;D
M_CAP	Benign	0.031	D
MetaRNN	Pathogenic	0.76	D;D;D;D
MetaSVM	Benign	-0.62	T
MutationAssessor	Benign	0.92	L;.;L;.
PrimateAI	Pathogenic	0.81	D
PROVEAN	Benign	-2.2	N;N;N;N
REVEL	Uncertain	0.30
Sift	Benign	0.11	T;T;T;T
Sift4G	Benign	0.28	T;T;T;T
Polyphen		0.93	P;.;D;.
Vest4		0.66
MutPred		0.60		Gain of methylation at K20 (P = 0.0175);Gain of methylation at K20 (P = 0.0175);Gain of methylation at K20 (P = 0.0175);Gain of methylation at K20 (P = 0.0175);
MVP		0.68
MPC		0.39
ClinPred		0.97	D
GERP RS		4.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.39
gMVP		0.38

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: chr4-128803014;