chr14-32545877-T-G

Position:

• chr14-32545877-T-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_004274.5(AKAP6):​c.1224T>G​(p.Asn408Lys) 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. 14/21 in silico tools predict 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. N408S) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: AKAP6 NM_004274.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.374

Genes affected

AKAP6 (HGNC:376): (A-kinase anchoring protein 6) The A-kinase anchor proteins (AKAPs) are a group of structurally diverse proteins, which have the common function of binding to the regulatory subunit of protein kinase A (PKA) and confining the holoenzyme to discrete locations within the cell. This gene encodes a member of the AKAP family. The encoded protein is highly expressed in various brain regions and cardiac and skeletal muscle. It is specifically localized to the sarcoplasmic reticulum and nuclear membrane, and is involved in anchoring PKA to the nuclear membrane or sarcoplasmic reticulum. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.067770034).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
AKAP6	NM_004274.5	c.1224T>G	p.Asn408Lys	missense_variant	4/14	ENST00000280979.9	NP_004265.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
AKAP6	ENST00000280979.9	c.1224T>G	p.Asn408Lys	missense_variant	4/14	1	NM_004274.5	ENSP00000280979	P1
AKAP6	ENST00000557354.5	c.1224T>G	p.Asn408Lys	missense_variant	4/10	1		ENSP00000450531
AKAP6	ENST00000557272.1	c.1224T>G	p.Asn408Lys	missense_variant	4/13	5		ENSP00000451247
AKAP6	ENST00000553547.5	c.498T>G	p.Asn166Lys	missense_variant	3/3	2		ENSP00000451239

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

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

Feb 09, 2019

This variant has not been reported in the literature in individuals with AKAP6-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces asparagine with lysine at codon 408 of the AKAP6 protein (p.Asn408Lys). The asparagine residue is weakly conserved and there is a moderate physicochemical difference between asparagine and lysine. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The lysine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.32	T
BayesDel_noAF	Benign	-0.70
CADD	Benign	0.44
DANN	Benign	0.62
DEOGEN2	Benign	0.069	T;.;.;.
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.33	N
LIST_S2	Benign	0.67	T;T;T;T
M_CAP	Benign	0.011	T
MetaRNN	Benign	0.068	T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.2	L;L;.;.
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.28	T
PROVEAN	Benign	-1.1	N;N;N;N
REVEL	Benign	0.028
Sift	Uncertain	0.027	D;D;D;T
Sift4G	Benign	0.56	T;T;T;D
Polyphen		0.049	B;.;.;.
Vest4		0.058
MutPred		0.22		Loss of ubiquitination at K411 (P = 0.0162);Loss of ubiquitination at K411 (P = 0.0162);Loss of ubiquitination at K411 (P = 0.0162);.;
MVP		0.42
MPC		0.065
ClinPred		0.079	T
GERP RS		-1.1
Varity_R		0.081
gMVP		0.078

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: rs1883175754; hg19: chr14-33015083;