chr14-104770394-C-T

Position:

• chr14-104770394-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_001382430.1(AKT1):​c.1390G>A​(p.Glu464Lys) variant causes a missense change. The variant allele was found at a frequency of 0.0000123 in 1,460,162 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: AKT1 NM_001382430.1 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 4.93

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), AKT1. . Gene score misZ 3.4778 (greater than the threshold 3.09). Trascript score misZ 4.2155 (greater than threshold 3.09). GenCC has associacion of gene with Proteus syndrome, Cowden disease, Cowden syndrome 6.
• BP4: Computational evidence support a benign effect (MetaRNN=0.337681).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AKT1	NM_001382430.1	c.1390G>A	p.Glu464Lys	missense_variant	15/15	ENST00000649815.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AKT1	ENST00000649815.2	c.1390G>A	p.Glu464Lys	missense_variant	15/15		NM_001382430.1	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.0000367 AC: 9 AN: 245470 Hom.: 0 AF XY: 0.0000375 AC XY: 5 AN XY: 133354

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000291

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000547

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000543

Gnomad OTH exome AF: 0.000166

GnomAD4 exome AF: 0.0000123 AC: 18 AN: 1460162 Hom.: 0 Cov.: 31 AF XY: 0.0000138 AC XY: 10 AN XY: 726334

Gnomad4 AFR exome AF: 0.0000598

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000117

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000771 Hom.: 0

Bravo AF: 0.0000302

ExAC AF: 0.0000247 AC: 3

EpiCase AF: 0.00

EpiControl AF: 0.0000594

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Cowden syndrome 6 Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Sep 23, 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 are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 584874). This variant has not been reported in the literature in individuals affected with AKT1-related conditions. This variant is present in population databases (rs745803788, gnomAD 0.006%). This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 464 of the AKT1 protein (p.Glu464Lys). -
Uncertain significance, criteria provided, single submitter	clinical testing	Mendelics	Jul 02, 2018	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.28
BayesDel_addAF	Benign	-0.094	T
BayesDel_noAF	Benign	-0.19
CADD	Benign	22
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.53	D;D;D;D;D;D;D
Eigen	Benign	0.15
Eigen_PC	Uncertain	0.24
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.97	.;.;.;.;.;.;D
M_CAP	Benign	0.062	D
MetaRNN	Benign	0.34	T;T;T;T;T;T;T
MetaSVM	Benign	-0.64	T
MutationAssessor	Benign	1.8	L;L;L;L;L;L;L
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.66	T
PROVEAN	Uncertain	-2.7	D;D;D;D;D;.;D
REVEL	Benign	0.18
Sift	Uncertain	0.0070	D;D;D;D;D;.;D
Sift4G	Benign	0.097	T;T;T;T;T;.;T
Polyphen		0.55	P;P;P;P;P;P;P
Vest4		0.40
MutPred		0.41		Gain of catalytic residue at E464 (P = 0);Gain of catalytic residue at E464 (P = 0);Gain of catalytic residue at E464 (P = 0);Gain of catalytic residue at E464 (P = 0);Gain of catalytic residue at E464 (P = 0);Gain of catalytic residue at E464 (P = 0);Gain of catalytic residue at E464 (P = 0);
MVP		0.54
MPC		1.3
ClinPred		0.33	T
GERP RS		4.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.86
gMVP		0.49

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs745803788; hg19: chr14-105236731; COSMIC: COSV62576731; COSMIC: COSV62576731;