chr17-39687946-G-T

Variant names:

• chr17-39687946-G-T
• rs375234528
• NM_033419.5:c.69C>A

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_033419.5(PGAP3):​c.69C>A​(p.Gly23Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000757 in 1,321,034 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. G23G) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.6e-7 (0 hom.)
• Consequence: PGAP3 NM_033419.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.228
• Publications: 0 publications found

Genes affected

PGAP3 (HGNC:23719): (post-GPI attachment to proteins phospholipase 3) This gene encodes a glycosylphosphatidylinositol (GPI)-specific phospholipase that primarily localizes to the Golgi apparatus. This ubiquitously expressed gene is predicted to encode a seven-transmembrane protein that removes unsaturated fatty acids from the sn-2 position of GPI. The remodeling of the constituent fatty acids on GPI is thought to be important for the proper association between GPI-anchored proteins and lipid rafts. The tethering of proteins to plasma membranes via posttranslational GPI-anchoring is thought to play a role in protein sorting and trafficking. Mutations in this gene cause an autosomal recessive form of neurologic hyperphosphatasia with cognitive disability (HPMRS4). Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Jul 2017]

ERBB2 (HGNC:3430): (erb-b2 receptor tyrosine kinase 2) This gene encodes a member of the epidermal growth factor (EGF) receptor family of receptor tyrosine kinases. This protein has no ligand binding domain of its own and therefore cannot bind growth factors. However, it does bind tightly to other ligand-bound EGF receptor family members to form a heterodimer, stabilizing ligand binding and enhancing kinase-mediated activation of downstream signalling pathways, such as those involving mitogen-activated protein kinase and phosphatidylinositol-3 kinase. Allelic variations at amino acid positions 654 and 655 of isoform a (positions 624 and 625 of isoform b) have been reported, with the most common allele, Ile654/Ile655, shown here. Amplification and/or overexpression of this gene has been reported in numerous cancers, including breast and ovarian tumors. Alternative splicing results in several additional transcript variants, some encoding different isoforms and others that have not been fully characterized. [provided by RefSeq, Jul 2008]

ERBB2 Gene-Disease associations (from GenCC):

• Hirschsprung disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• lung cancer

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• glioma susceptibility 1

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
• visceral neuropathy, familial, 2, autosomal recessive

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.42).
• BP7: Synonymous conserved (PhyloP=0.228 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_033419.5. 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
	PGAP3	NM_033419.5	MANE Select	c.69C>A	p.Gly23Gly	synonymous	Exon 1 of 8	NP_219487.3
	PGAP3	NM_001291728.2		c.69C>A	p.Gly23Gly	synonymous	Exon 1 of 7	NP_001278657.1
	PGAP3	NM_001291726.2		c.69C>A	p.Gly23Gly	synonymous	Exon 1 of 7	NP_001278655.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PGAP3	ENST00000300658.9	TSL:1 MANE Select	c.69C>A	p.Gly23Gly	synonymous	Exon 1 of 8	ENSP00000300658.4
	PGAP3	ENST00000429199.6	TSL:2	c.69C>A	p.Gly23Gly	synonymous	Exon 1 of 7	ENSP00000415765.2
	PGAP3	ENST00000378011.8	TSL:2	c.69C>A	p.Gly23Gly	synonymous	Exon 1 of 7	ENSP00000367250.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.57e-7 AC: 1 AN: 1321034 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 645152

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 28808

American (AMR) AF: 0.00 AC: 0 AN: 29808

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23660

East Asian (EAS) AF: 0.00 AC: 0 AN: 31296

South Asian (SAS) AF: 0.00 AC: 0 AN: 72962

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 47450

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3960

European-Non Finnish (NFE) AF: 9.72e-7 AC: 1 AN: 1029138

Other (OTH) AF: 0.00 AC: 0 AN: 53952

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.42
CADD	Benign	11
DANN	Benign	0.92
PhyloP100		0.23
PromoterAI		-0.072	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6

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: rs375234528; hg19: chr17-37844199;