1-46043748-C-G

Position:

• chr1-46043748-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_003629.4(PIK3R3):​c.1311G>C​(p.Leu437Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PIK3R3 NM_003629.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.169

Genes affected

PIK3R3 (HGNC:8981): (phosphoinositide-3-kinase regulatory subunit 3) Phosphatidylinositol 3-kinase (PI3K) phosphorylates phosphatidylinositol and similar compounds, which then serve as second messengers in growth signaling pathways. PI3K is composed of a catalytic and a regulatory subunit. The protein encoded by this gene represents a regulatory subunit of PI3K. The encoded protein contains two SH2 domains through which it binds activated protein tyrosine kinases to regulate their activity. [provided by RefSeq, Jun 2016]

P3R3URF-PIK3R3 (HGNC:54999): (P3R3URF-PIK3R3 readthrough) This locus represents naturally occurring readthrough transcription between the neighboring genes LOC110117498 and PIK3R3. The readthrough transcript encodes a fusion protein that shares sequence identity with each individual gene product. [provided by RefSeq, Apr 2017]

PIK3R3 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.825

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PIK3R3	NM_003629.4	c.1311G>C	p.Leu437Phe	missense_variant	10/10	ENST00000262741.10	NP_003620.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PIK3R3	ENST00000262741.10	c.1311G>C	p.Leu437Phe	missense_variant	10/10	1	NM_003629.4	ENSP00000262741.5
P3R3URF-PIK3R3	ENST00000540385.2	c.1449G>C	p.Leu483Phe	missense_variant	10/10	2		ENSP00000439913.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 28, 2024

The c.1311G>C (p.L437F) alteration is located in exon 10 (coding exon 10) of the PIK3R3 gene. This alteration results from a G to C substitution at nucleotide position 1311, causing the leucine (L) at amino acid position 437 to be replaced by a phenylalanine (F). 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	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.12
CADD	Benign	20
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.68	D;D;D;.;.
Eigen	Uncertain	0.24
Eigen_PC	Benign	0.062
FATHMM_MKL	Uncertain	0.83	D
LIST_S2	Uncertain	0.93	.;.;D;D;D
M_CAP	Uncertain	0.15	D
MetaRNN	Pathogenic	0.83	D;D;D;D;D
MetaSVM	Uncertain	0.56	D
MutationAssessor	Uncertain	2.8	M;M;M;.;.
PrimateAI	Pathogenic	0.83	D
PROVEAN	Uncertain	-3.7	D;D;D;D;D
REVEL	Pathogenic	0.65
Sift	Pathogenic	0.0	D;D;D;D;D
Sift4G	Uncertain	0.0030	D;D;D;D;D
Polyphen		1.0	D;D;D;D;.
Vest4		0.84
MutPred		0.42		.;.;.;.;Gain of helix (P = 0.132);
MVP		0.93
MPC		0.57
ClinPred		1.0	D
GERP RS		-3.2
Varity_R		0.75
gMVP		0.60

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-46509420;