Genetic Variant AQP12A:p.Ala21Asp (chr2-240691975-C-A) – ACMG Classification: Likely_benign (-5 pts)

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4BS2

The NM_198998.3(AQP12A):c.62C>A(p.Ala21Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000529 in 1,588,622 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000047 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000053 ( 4 hom. )

Consequence

AQP12A
NM_198998.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.174

Variant links:

Genes affected

AQP12A (HGNC:19941): (aquaporin 12A) Predicted to enable channel activity. Predicted to be involved in transmembrane transport. Predicted to be integral component of membrane. Predicted to be active in cytoplasm. [provided by Alliance of Genome Resources, Apr 2022]

AQP12A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.38100088).

BS2

High Homozygotes in GnomAdExome4 at 4 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AQP12A	NM_198998.3 link	c.62C>A	p.Ala21Asp	missense_variant	Exon 1 of 4	ENST00000337801.9	NP_945349.1	Q8IXF9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AQP12A	ENST00000337801.9 link	c.62C>A	p.Ala21Asp	missense_variant	Exon 1 of 4	1	NM_198998.3	ENSP00000337144.4		Q8IXF9

Frequencies

GnomAD3 genomes

AF:

0.0000472

AC:

AN:

148290

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000104

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000371

AC:

AN:

242804

Hom.:

AF XY:

0.0000378

AC XY:

AN XY:

132324

show subpopulations

Gnomad AFR exome

AF:

0.000195

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000535

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000535

AC:

AN:

1440332

Hom.:

Cov.:

AF XY:

0.0000600

AC XY:

AN XY:

716808

show subpopulations

Gnomad4 AFR exome

AF:

0.0000304

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:

0.0000617

Gnomad4 OTH exome

AF:

0.000134

GnomAD4 genome

AF:

0.0000472

AC:

AN:

148290

Hom.:

Cov.:

AF XY:

0.0000830

AC XY:

AN XY:

72248

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000104

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000828

Hom.:

Bravo

AF:

0.0000567

ESP6500AA

AF:

0.000461

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000502

AC:

EpiCase

AF:

0.0000549

EpiControl

AF:

0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 20, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.62C>A (p.A21D) alteration is located in exon 1 (coding exon 1) of the AQP12A gene. This alteration results from a C to A substitution at nucleotide position 62, causing the alanine (A) at amino acid position 21 to be replaced by an aspartic acid (D). 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

Pathogenic

0.67

BayesDel_addAF

Benign

-0.40

BayesDel_noAF

Benign

-0.53

CADD

Benign

DANN

Benign

0.96

DEOGEN2

Uncertain

0.59

D;.

Eigen

Benign

-0.49

Eigen_PC

Benign

-0.50

FATHMM_MKL

Benign

0.59

LIST_S2

Benign

0.63

T;T

M_CAP

Benign

0.0051

MetaRNN

Benign

0.38

T;T

MetaSVM

Benign

-1.1

MutationAssessor

Uncertain

2.2

M;.

PrimateAI

Uncertain

0.71

PROVEAN

Uncertain

-2.9

D;D

REVEL

Benign

0.15

Sift

Benign

0.15

T;T

Sift4G

Benign

0.071

T;T

Polyphen

0.26

B;.

Vest4

0.60

MVP

0.30

MPC

0.68

ClinPred

0.084

GERP RS

1.5

Varity_R

0.16

gMVP

0.82

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over