Genetic Variant PIK3C3:p.Thr126Met (chr18-41962608-C-T) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PP3_ModerateBS2

The NM_002647.4(PIK3C3):c.377C>T(p.Thr126Met) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000617 in 1,458,578 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

PIK3C3
NM_002647.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.70

Variant links:

Genes affected

PIK3C3 (HGNC:8974): (phosphatidylinositol 3-kinase catalytic subunit type 3) Enables 1-phosphatidylinositol-3-kinase activity. Involved in early endosome to late endosome transport and regulation of cytokinesis. Acts upstream of or within autophagy and protein lipidation. Located in autolysosome; late endosome; and midbody. [provided by Alliance of Genome Resources, Apr 2022]

PIK3C3 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.9

BS2

High AC in GnomAdExome4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PIK3C3	NM_002647.4 link	c.377C>T	p.Thr126Met	missense_variant	Exon 3 of 25	ENST00000262039.9	NP_002638.2	Q8NEB9
PIK3C3	NM_001308020.2 link	c.188C>T	p.Thr63Met	missense_variant	Exon 2 of 24		NP_001294949.1	A8MYT4B4DPV9
PIK3C3	XM_047437549.1 link	c.377C>T	p.Thr126Met	missense_variant	Exon 3 of 22		XP_047293505.1
PIK3C3	XM_047437551.1 link	c.377C>T	p.Thr126Met	missense_variant	Exon 3 of 14		XP_047293507.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PIK3C3	ENST00000262039.9 link	c.377C>T	p.Thr126Met	missense_variant	Exon 3 of 25	1	NM_002647.4	ENSP00000262039.3		Q8NEB9

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000160

AC:

AN:

249492

Hom.:

AF XY:

0.0000222

AC XY:

AN XY:

134912

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000292

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000548

Gnomad SAS exome

AF:

0.0000329

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000886

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000617

AC:

AN:

1458578

Hom.:

Cov.:

AF XY:

0.00000827

AC XY:

AN XY:

725644

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000758

Gnomad4 SAS exome

AF:

0.0000233

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000270

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000413

Hom.:

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Nov 13, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.377C>T (p.T126M) alteration is located in exon 3 (coding exon 3) of the PIK3C3 gene. This alteration results from a C to T substitution at nucleotide position 377, causing the threonine (T) at amino acid position 126 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.51

BayesDel_addAF

Pathogenic

0.22

BayesDel_noAF

Pathogenic

0.24

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.96

D;.;D;.

Eigen

Pathogenic

0.88

Eigen_PC

Pathogenic

0.84

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.97

D;D;D;D

M_CAP

Uncertain

0.16

MetaRNN

Pathogenic

0.90

D;D;D;D

MetaSVM

Uncertain

0.36

MutationAssessor

Pathogenic

3.2

M;.;.;.

PrimateAI

Pathogenic

0.88

PROVEAN

Pathogenic

-4.9

D;.;D;.

REVEL

Pathogenic

0.69

Sift

Uncertain

0.0010

D;.;D;.

Sift4G

Pathogenic

0.0010

D;.;D;D

Polyphen

1.0

D;.;D;.

Vest4

0.85

MVP

0.89

MPC

0.78

ClinPred

0.98

GERP RS

5.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.49

gMVP

0.68

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over