19-18169200-AC-CT

Variant names:

• chr19-18169200-AC-CT
• NM_005027.4:c.2093_2094delACinsCT
• PIK3R2 p.His698Pro

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_005027.4(PIK3R2):​c.2093_2094delACinsCT​(p.His698Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type MNV, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Synonymous variant affecting the same amino acid position (i.e. H698H) has been classified as Likely benign. The gene PIK3R2 is included in the ClinGen Criteria Specification Registry.

• Frequency: Genomes: not found (cov: 33)
• Consequence: PIK3R2 NM_005027.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.29
• Publications: 0 publications found

Genes affected

PIK3R2 (HGNC:8980): (phosphoinositide-3-kinase regulatory subunit 2) Phosphatidylinositol 3-kinase (PI3K) is a lipid kinase that phosphorylates phosphatidylinositol and similar compounds, creating second messengers important in growth signaling pathways. PI3K functions as a heterodimer of a regulatory and a catalytic subunit. The protein encoded by this gene is a regulatory component of PI3K. Three transcript variants, one protein coding and the other two non-protein coding, have been found for this gene. [provided by RefSeq, Apr 2019]

PIK3R2 Gene-Disease associations (from GenCC):

• megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Illumina, Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp
• overgrowth syndrome and/or cerebral malformations due to abnormalities in MTOR pathway genes

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

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000268173 (HGNC:):

ACMG classification

Specifications for PIK3R2 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005027.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIK3R2	NM_005027.4	MANE Select	c.2093_2094delACinsCT	p.His698Pro	missense	N/A	NP_005018.2	O00459
	PIK3R2	NR_073517.2		n.2697_2698delACinsCT		non_coding_transcript_exon	Exon 16 of 16
	PIK3R2	NR_162071.1		n.2435_2436delACinsCT		non_coding_transcript_exon	Exon 15 of 15

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PIK3R2	ENST00000222254.13	TSL:1 MANE Select	c.2093_2094delACinsCT	p.His698Pro	missense	N/A	ENSP00000222254.6	O00459
	ENSG00000268173	ENST00000593731.1	TSL:2	n.2093_2094delACinsCT		non_coding_transcript_exon	Exon 16 of 25	ENSP00000471914.1
	PIK3R2	ENST00000617130.6	TSL:1	n.*1121_*1122delACinsCT		non_coding_transcript_exon	Exon 15 of 15	ENSP00000477864.2	A0A7I2U3A3

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr19-18280010;