14-104770411-A-T

Variant names:

• chr14-104770411-A-T
• rs587778018
• NM_001382430.1:c.1373T>A

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4 BS2

The NM_001382430.1(AKT1):​c.1373T>A​(p.Met458Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000548 in 1,459,110 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 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. M458V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: AKT1 NM_001382430.1 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 9.19
• Publications: 5 publications found

Genes affected

AKT1 (HGNC:391): (AKT serine/threonine kinase 1) This gene encodes one of the three members of the human AKT serine-threonine protein kinase family which are often referred to as protein kinase B alpha, beta, and gamma. These highly similar AKT proteins all have an N-terminal pleckstrin homology domain, a serine/threonine-specific kinase domain and a C-terminal regulatory domain. These proteins are phosphorylated by phosphoinositide 3-kinase (PI3K). AKT/PI3K forms a key component of many signalling pathways that involve the binding of membrane-bound ligands such as receptor tyrosine kinases, G-protein coupled receptors, and integrin-linked kinase. These AKT proteins therefore regulate a wide variety of cellular functions including cell proliferation, survival, metabolism, and angiogenesis in both normal and malignant cells. AKT proteins are recruited to the cell membrane by phosphatidylinositol 3,4,5-trisphosphate (PIP3) after phosphorylation of phosphatidylinositol 4,5-bisphosphate (PIP2) by PI3K. Subsequent phosphorylation of both threonine residue 308 and serine residue 473 is required for full activation of the AKT1 protein encoded by this gene. Phosphorylation of additional residues also occurs, for example, in response to insulin growth factor-1 and epidermal growth factor. Protein phosphatases act as negative regulators of AKT proteins by dephosphorylating AKT or PIP3. The PI3K/AKT signalling pathway is crucial for tumor cell survival. Survival factors can suppress apoptosis in a transcription-independent manner by activating AKT1 which then phosphorylates and inactivates components of the apoptotic machinery. AKT proteins also participate in the mammalian target of rapamycin (mTOR) signalling pathway which controls the assembly of the eukaryotic translation initiation factor 4F (eIF4E) complex and this pathway, in addition to responding to extracellular signals from growth factors and cytokines, is disregulated in many cancers. Mutations in this gene are associated with multiple types of cancer and excessive tissue growth including Proteus syndrome and Cowden syndrome 6, and breast, colorectal, and ovarian cancers. Multiple alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Jul 2020]

AKT1 Gene-Disease associations (from GenCC):

• Proteus syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• Cowden disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Cowden syndrome 6

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ENSG00000258430 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.33089098).
• BS2: High AC in GnomAdExome4 at 8 AD,Unknown gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001382430.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	AKT1	NM_001382430.1	MANE Select	c.1373T>A	p.Met458Lys	missense	Exon 15 of 15	NP_001369359.1
	AKT1	NM_001014431.2		c.1373T>A	p.Met458Lys	missense	Exon 14 of 14	NP_001014431.1
	AKT1	NM_001014432.2		c.1373T>A	p.Met458Lys	missense	Exon 15 of 15	NP_001014432.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	AKT1	ENST00000649815.2	MANE Select	c.1373T>A	p.Met458Lys	missense	Exon 15 of 15	ENSP00000497822.1
	AKT1	ENST00000349310.7	TSL:1	c.1373T>A	p.Met458Lys	missense	Exon 15 of 15	ENSP00000270202.4
	AKT1	ENST00000402615.6	TSL:1	c.1373T>A	p.Met458Lys	missense	Exon 14 of 14	ENSP00000385326.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.0000165 AC: 4 AN: 242576 AF XY: 0.0000228

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000366

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000548 AC: 8 AN: 1459110 Hom.: 0 Cov.: 31 AF XY: 0.00000551 AC XY: 4 AN XY: 725692

African (AFR) AF: 0.00 AC: 0 AN: 33460

American (AMR) AF: 0.00 AC: 0 AN: 44568

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26092

East Asian (EAS) AF: 0.00 AC: 0 AN: 39662

South Asian (SAS) AF: 0.00 AC: 0 AN: 85738

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52052

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5670

European-Non Finnish (NFE) AF: 0.00000720 AC: 8 AN: 1111564

Other (OTH) AF: 0.00 AC: 0 AN: 60304

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000825 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Cowden syndrome 6 Uncertain:1

Mar 11, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces methionine, which is neutral and non-polar, with lysine, which is basic and polar, at codon 458 of the AKT1 protein (p.Met458Lys). This variant is present in population databases (rs587778018, gnomAD 0.004%). This variant has not been reported in the literature in individuals affected with AKT1-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). 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.

not provided Uncertain:1

May 01, 2022

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

AKT1: PP2

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.061	T
BayesDel_noAF	Benign	-0.22
CADD	Benign	22
DANN	Benign	0.96
DEOGEN2	Uncertain	0.55	D
Eigen	Benign	-0.090
Eigen_PC	Benign	0.021
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.84	T
M_CAP	Benign	0.050	D
MetaRNN	Benign	0.33	T
MetaSVM	Benign	-0.90	T
MutationAssessor	Benign	2.0	M
PhyloP100		9.2
PrimateAI	Uncertain	0.59	T
PROVEAN	Uncertain	-2.9	D
REVEL	Benign	0.21
Sift	Benign	0.090	T
Sift4G	Benign	0.32	T
Polyphen		0.0020	B
Vest4		0.67
MutPred		0.41		Gain of ubiquitination at M458 (P = 0.0016)
MVP		0.64
MPC		0.95
ClinPred		0.72	D
GERP RS		4.4
Varity_R		0.85
gMVP		0.60
Mutation Taster		=34/66	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs587778018; hg19: chr14-105236748;