15-84817379-G-T

Position:

• chr15-84817379-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_020778.5(ALPK3):​c.-74G>T variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000561 in 1,070,336 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 Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000056 (0 hom.)
• Consequence: ALPK3 NM_020778.5 5_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 1.82

Genes affected

ALPK3 (HGNC:17574): (alpha kinase 3) Predicted to enable ATP binding activity; protein serine kinase activity; and protein serine/threonine kinase activity. Predicted to be involved in cardiac muscle cell development. Predicted to be active in nucleus. Implicated in hypertrophic cardiomyopathy. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.16046423).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ALPK3	NM_020778.5	c.-74G>T		5_prime_UTR_variant	1/14	ENST00000258888.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ALPK3	ENST00000258888.6	c.-74G>T		5_prime_UTR_variant	1/14	1	NM_020778.5	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000561 AC: 6 AN: 1070336 Hom.: 0 Cov.: 50 AF XY: 0.00 AC XY: 0 AN XY: 506642

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000404

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.000117

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000712 Hom.: 0

Bravo AF: 0.0000151

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jan 31, 2024

This sequence change replaces glycine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 178 of the ALPK3 protein (p.Gly178Val). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with ALPK3-related conditions. ClinVar contains an entry for this variant (Variation ID: 1425084). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. 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. -

Cardiovascular phenotype Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 04, 2021

The p.G178V variant (also known as c.533G>T), located in coding exon 1 of the ALPK3 gene, results from a G to T substitution at nucleotide position 533. The glycine at codon 178 is replaced by valine, an amino acid with dissimilar properties. This amino acid position is highly 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	0.11
BayesDel_addAF	Benign	-0.030	T
BayesDel_noAF	Benign	-0.28
CADD	Benign	16
DANN	Uncertain	0.99
DEOGEN2	Benign	0.0035	T
Eigen	Benign	-0.94
Eigen_PC	Benign	-0.97
FATHMM_MKL	Benign	0.17	N
LIST_S2	Benign	0.36	T
M_CAP	Pathogenic	0.48	D
MetaRNN	Benign	0.16	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.81	L
MutationTaster	Benign	1.0	N
PrimateAI	Pathogenic	0.80	T
PROVEAN	Benign	-0.86	N
REVEL	Benign	0.12
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.024	D
Polyphen		0.016	B
Vest4		0.15
MutPred		0.39		Loss of catalytic residue at G178 (P = 0.0673);
MVP		0.55
MPC		1.3
ClinPred		0.13	T
GERP RS		-0.90
Varity_R		0.14
gMVP		0.16

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs1444549839; hg19: chr15-85360610;