1-243512402-C-T

Variant names:

• chr1-243512402-C-T
• rs868556430
• NM_005465.7:c.1276G>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_005465.7(AKT3):​c.1276G>A​(p.Val426Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V426L) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: AKT3 NM_005465.7 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.91
• Publications: 0 publications found

Genes affected

AKT3 (HGNC:393): (AKT serine/threonine kinase 3) The protein encoded by this gene is a member of the AKT, also called PKB, serine/threonine protein kinase family. AKT kinases are known to be regulators of cell signaling in response to insulin and growth factors. They are involved in a wide variety of biological processes including cell proliferation, differentiation, apoptosis, tumorigenesis, as well as glycogen synthesis and glucose uptake. This kinase has been shown to be stimulated by platelet-derived growth factor (PDGF), insulin, and insulin-like growth factor 1 (IGF1). Alternatively splice transcript variants encoding distinct isoforms have been described. [provided by RefSeq, Jul 2008]

AKT3 Gene-Disease associations (from GenCC):

• overgrowth syndrome and/or cerebral malformations due to abnormalities in MTOR pathway genes

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 1

  Inheritance: AD Classification: STRONG Submitted by: G2P
• megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 2

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp, Illumina, Labcorp Genetics (formerly Invitae)
• megalencephaly-polymicrogyria-postaxial polydactyly-hydrocephalus syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• microcephaly

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the AKT3 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 13 curated pathogenic missense variants (we use a threshold of 10). The gene has 2 curated benign missense variants. Gene score misZ: 3.946 (above the threshold of 3.09). Trascript score misZ: 4.2291 (above the threshold of 3.09). GenCC associations: The gene is linked to megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 2, microcephaly, megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 1, megalencephaly-polymicrogyria-postaxial polydactyly-hydrocephalus syndrome, overgrowth syndrome and/or cerebral malformations due to abnormalities in MTOR pathway genes.
• BP4: Computational evidence support a benign effect (MetaRNN=0.27264178).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AKT3	NM_005465.7	c.1276G>A	p.Val426Ile	missense_variant	Exon 13 of 14	ENST00000673466.1	NP_005456.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AKT3	ENST00000673466.1	c.1276G>A	p.Val426Ile	missense_variant	Exon 13 of 14		NM_005465.7	ENSP00000500582.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1435322 Hom.: 0 Cov.: 27 AF XY: 0.00 AC XY: 0 AN XY: 714798

African (AFR) AF: 0.00 AC: 0 AN: 32374

American (AMR) AF: 0.00 AC: 0 AN: 41442

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25782

East Asian (EAS) AF: 0.00 AC: 0 AN: 39146

South Asian (SAS) AF: 0.00 AC: 0 AN: 82804

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52328

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5700

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1096304

Other (OTH) AF: 0.00 AC: 0 AN: 59442

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.32
BayesDel_addAF	Benign	-0.011	T
BayesDel_noAF	Benign	-0.25
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.40	.;.;T;T
Eigen	Uncertain	0.23
Eigen_PC	Uncertain	0.43
FATHMM_MKL	Pathogenic	0.99	D
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.27	T;T;T;T
MetaSVM	Benign	-0.80	T
MutationAssessor	Benign	1.5	L;L;L;L
PhyloP100		7.9
PrimateAI	Pathogenic	0.79	T
PROVEAN	Benign	-0.73	N;N;N;N
REVEL	Benign	0.13
Sift	Benign	0.084	T;T;T;T
Sift4G	Benign	0.22	T;T;T;T
Polyphen		0.043	B;B;B;B
Vest4		0.52
MutPred		0.57		Loss of disorder (P = 0.1592);Loss of disorder (P = 0.1592);Loss of disorder (P = 0.1592);Loss of disorder (P = 0.1592);
MVP		0.56
MPC		1.4
ClinPred		0.78	D
GERP RS		5.9
Varity_R		0.15
gMVP		0.051
Mutation Taster		=46/54	disease causing

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

Other links and lift over

dbSNP: rs868556430; hg19: chr1-243675704;