chrX-40600863-C-G

Variant names:

• chrX-40600863-C-G
• rs1555978066
• NM_005765.3:c.840C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_005765.3(ATP6AP2):​c.840C>G​(p.Ile280Met) 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 benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I280V) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 22)
• Consequence: ATP6AP2 NM_005765.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.717
• Publications: 0 publications found

Genes affected

ATP6AP2 (HGNC:18305): (ATPase H+ transporting accessory protein 2) This gene encodes a protein that is associated with adenosine triphosphatases (ATPases). Proton-translocating ATPases have fundamental roles in energy conservation, secondary active transport, acidification of intracellular compartments, and cellular pH homeostasis. There are three classes of ATPases- F, P, and V. The vacuolar (V-type) ATPases have a transmembrane proton-conducting sector and an extramembrane catalytic sector. The encoded protein has been found associated with the transmembrane sector of the V-type ATPases. [provided by RefSeq, Jul 2008]

ATP6AP2 Gene-Disease associations (from GenCC):

• ATP6AP2-related disorder

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• congenital disorder of glycosylation, type IIr

  Inheritance: AR, XL Classification: STRONG Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae)
• syndromic X-linked intellectual disability Hedera type

  Inheritance: XL Classification: STRONG, MODERATE, SUPPORTIVE, LIMITED Submitted by: Orphanet, Ambry Genetics, G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• X-linked parkinsonism-spasticity syndrome

  Inheritance: XL, Unknown Classification: MODERATE, SUPPORTIVE, LIMITED Submitted by: Orphanet, Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.24736238).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ATP6AP2	NM_005765.3	c.840C>G	p.Ile280Met	missense_variant	Exon 8 of 9	ENST00000636580.2	NP_005756.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ATP6AP2	ENST00000636580.2	c.840C>G	p.Ile280Met	missense_variant	Exon 8 of 9	1	NM_005765.3	ENSP00000490083.1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 22

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Syndromic X-linked intellectual disability Hedera type Uncertain:1

Jun 22, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces isoleucine with methionine at codon 280 of the ATP6AP2 protein (p.Ile280Met). The isoleucine residue is highly conserved and there is a small physicochemical difference between isoleucine and methionine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with an ATP6AP2-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). In summary, this variant has uncertain impact on ATP6AP2 function. The available evidence is currently insufficient to determine its role in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.22
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.39
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Benign	0.10	T;.;T;T;T;.;T;.;T;T;T;.;T
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Uncertain	0.94	D;D;D;D;D;D;D;D;D;D;D;D;D
M_CAP	Benign	0.075	D
MetaRNN	Benign	0.25	T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.74	T
MutationAssessor	Uncertain	2.7	M;.;.;.;.;.;.;.;.;.;.;.;.
PhyloP100		0.72
PrimateAI	Benign	0.45	T
PROVEAN	Benign	-1.3	.;.;.;.;.;N;.;.;.;.;.;.;.
REVEL	Benign	0.25
Sift	Uncertain	0.015	.;.;.;.;.;D;.;.;.;.;.;.;.
Sift4G	Uncertain	0.025	.;.;.;.;.;D;.;.;.;.;.;.;.
Polyphen		0.97	D;.;D;.;.;.;.;.;.;.;D;.;.
Vest4		0.33
MutPred		0.41		Gain of disorder (P = 0.048);.;.;.;.;Gain of disorder (P = 0.048);.;.;.;.;.;.;.;
MVP		0.58
MPC		1.4
ClinPred		0.91	D
GERP RS		2.1
PromoterAI		0.00050	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.73
gMVP		0.80
Mutation Taster		=57/43	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1555978066; hg19: chrX-40460115;