chrX-40580946-G-T

Variant names:

• chrX-40580946-G-T
• rs186401295
• ENST00000636639.1:n.-120G>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The ENST00000636409.1(ATP6AP2):​c.-120G>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000128 in 783,985 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 25)
  • Exomes 𝑓: 0.0000013 (0 hom. 0 hem.)
• Consequence: ATP6AP2 ENST00000636409.1 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.367
• 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: XL Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• syndromic X-linked intellectual disability Hedera type

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

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

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.77).

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000636409.1. 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
	ATP6AP2	NM_005765.3	MANE Select	c.-120G>T		upstream_gene	N/A	NP_005756.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ATP6AP2	ENST00000636639.1	TSL:1	n.-120G>T		5_prime_UTR_premature_start_codon_gain	Exon 1 of 10	ENSP00000490382.1	A0A1B0GV60
	ATP6AP2	ENST00000636639.1	TSL:1	n.-120G>T		non_coding_transcript_exon	Exon 1 of 10	ENSP00000490382.1	A0A1B0GV60
	ATP6AP2	ENST00000636639.1	TSL:1	n.-120G>T		5_prime_UTR	Exon 1 of 10	ENSP00000490382.1	A0A1B0GV60

Frequencies

GnomAD3 genomes Cov.: 25

GnomAD4 exome AF: 0.00000128 AC: 1 AN: 783985 Hom.: 0 Cov.: 13 AF XY: 0.00 AC XY: 0 AN XY: 216345

⚠️ 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: 19521

American (AMR) AF: 0.00 AC: 0 AN: 27391

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 16825

East Asian (EAS) AF: 0.00 AC: 0 AN: 25651

South Asian (SAS) AF: 0.0000226 AC: 1 AN: 44289

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 30031

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3462

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 581205

Other (OTH) AF: 0.00 AC: 0 AN: 35610

⚠️ 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.: 25

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.77
CADD	Benign	4.7
DANN	Benign	0.69
PhyloP100		0.37
PromoterAI		-0.27	Neutral

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: rs186401295; hg19: chrX-40440198;