rs781339141

Positions:

• chr14-104780157-T-A
• chr14-104780157-T-C
• chr14-104780157-T-G

Variant summary

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

The NM_001382430.1(AKT1):​c.106A>T​(p.Ile36Phe) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts 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. I36T) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: AKT1 NM_001382430.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.21

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 where missense usually causes diseases, AKT1
• BP4: Computational evidence support a benign effect (MetaRNN=0.3632261).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AKT1	NM_001382430.1	c.106A>T	p.Ile36Phe	missense_variant	4/15	ENST00000649815.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AKT1	ENST00000649815.2	c.106A>T	p.Ile36Phe	missense_variant	4/15		NM_001382430.1	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 11, 2021

The p.I36F variant (also known as c.106A>T), located in coding exon 2 of the AKT1 gene, results from an A to T substitution at nucleotide position 106. The isoleucine at codon 36 is replaced by phenylalanine, an amino acid with highly similar properties. This amino acid position is conserved. In addition, the in silico prediction for this alteration is inconclusive. 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	0.33
BayesDel_addAF	Uncertain	0.064	T
BayesDel_noAF	Benign	-0.15
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.87	D;D;D;D;D;D;D;.
Eigen	Uncertain	0.23
Eigen_PC	Uncertain	0.26
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Benign	0.063	D
MetaRNN	Benign	0.36	T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	1.1	L;L;L;L;L;L;L;.
MutationTaster	Benign	1.0	D;D;D;D;D;D
PrimateAI	Uncertain	0.60	T
PROVEAN	Uncertain	-2.8	D;D;D;D;D;.;D;D
REVEL	Benign	0.24
Sift	Benign	0.24	T;T;T;T;T;.;T;T
Sift4G	Benign	0.26	T;T;T;T;T;.;T;.
Polyphen		0.97	D;D;D;D;D;D;D;.
Vest4		0.72
MutPred		0.55		Gain of catalytic residue at N31 (P = 0.0028);Gain of catalytic residue at N31 (P = 0.0028);Gain of catalytic residue at N31 (P = 0.0028);Gain of catalytic residue at N31 (P = 0.0028);Gain of catalytic residue at N31 (P = 0.0028);Gain of catalytic residue at N31 (P = 0.0028);Gain of catalytic residue at N31 (P = 0.0028);Gain of catalytic residue at N31 (P = 0.0028);
MVP		0.70
MPC		2.4
ClinPred		0.96	D
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.63
gMVP		0.77

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.16		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: chr14-105246494;