17-8828778-G-A

Position:

• chr17-8828778-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001010855.4(PIK3R6):​c.1102C>T​(p.Arg368Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000765 in 1,437,074 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000077 (0 hom.)
• Consequence: PIK3R6 NM_001010855.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.803

Genes affected

PIK3R6 (HGNC:27101): (phosphoinositide-3-kinase regulatory subunit 6) Phosphoinositide 3-kinase gamma is a lipid kinase that produces the lipid second messenger phosphatidylinositol 3,4,5-trisphosphate. The kinase is composed of a catalytic subunit and one of several regulatory subunits, and is chiefly activated by G protein-coupled receptors. This gene encodes a regulatory subunit, and is distantly related to the phosphoinositide-3-kinase, regulatory subunit 5 gene which is located adjacent to this gene on chromosome 7. The orthologous protein in the mouse binds to both the catalytic subunit and to G(beta/gamma), and mediates activation of the kinase subunit downstream of G protein-coupled receptors. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2014]

PIK3R6 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PIK3R6	NM_001010855.4	c.1102C>T	p.Arg368Cys	missense_variant	11/20	ENST00000619866.5	NP_001010855.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PIK3R6	ENST00000619866.5	c.1102C>T	p.Arg368Cys	missense_variant	11/20	5	NM_001010855.4	ENSP00000480157.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000765 AC: 11 AN: 1437074 Hom.: 0 Cov.: 32 AF XY: 0.00000702 AC XY: 5 AN XY: 711830

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000100

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

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 27, 2024

The c.1102C>T (p.R368C) alteration is located in exon 11 (coding exon 10) of the PIK3R6 gene. This alteration results from a C to T substitution at nucleotide position 1102, causing the arginine (R) at amino acid position 368 to be replaced by a cysteine (C). 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	0.40
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.020
CADD	Pathogenic	26
DANN	Benign	0.88
DEOGEN2	Benign	0.18	T;T
FATHMM_MKL	Uncertain	0.83	D
LIST_S2	Uncertain	0.91	D;.
M_CAP	Benign	0.065	D
MetaRNN	Uncertain	0.61	D;D
PrimateAI	Pathogenic	0.85	D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;D
Vest4		0.55
MVP		0.41
GERP RS		3.3
Varity_R		0.14
gMVP		0.59

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

Other links and lift over

dbSNP: rs1319133018; hg19: chr17-8732095; COSMIC: COSV61006388;