NM_020661.4:c.169G>A

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 15 ACMG points: 15P and 0B. PM2PP2PP3_StrongPP5_Very_Strong

The NM_020661.4(AICDA):c.169G>A(p.Val57Met) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,461,890 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V57A) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

AICDA
NM_020661.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 4.29

Publications

3 publications found

Variant links:

Genes affected

AICDA (HGNC:13203): (activation induced cytidine deaminase) This gene encodes a RNA-editing deaminase that is a member of the cytidine deaminase family. AICDA is specifically expressed and active in germinal center-like B cells. In the germinal center, AICDA is involved in somatic hypermutation, gene conversion, and class-switch recombination of immunoglobulin genes. An epigenetic role in neoplastic transformation and lymphoma progression has been experimentally ascribed to AICDA using mouse models. Defects in this gene are the cause of autosomal recessive hyper-IgM immunodeficiency syndrome type 2 (HIGM2). [provided by RefSeq, Jul 2020]

AICDA Gene-Disease associations (from GenCC):

hyper-IgM syndrome type 2
Inheritance: AD, AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Ambry Genetics, Labcorp Genetics (formerly Invitae)

AICDA links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 15 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 13 curated pathogenic missense variants (we use a threshold of 10). The gene has 2 curated benign missense variants. Gene score misZ: 1.3381 (below the threshold of 3.09). Trascript score misZ: 0.98605 (below the threshold of 3.09). GenCC associations: The gene is linked to hyper-IgM syndrome type 2.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.946

PP5

Variant 12-8605473-C-T is Pathogenic according to our data. Variant chr12-8605473-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 191031.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AICDA	NM_020661.4 link	c.169G>A	p.Val57Met	missense_variant	Exon 3 of 5	ENST00000229335.11	NP_065712.1	Q9GZX7-1Q546Y9Q7Z599
AICDA	NM_001330343.2 link	c.169G>A	p.Val57Met	missense_variant	Exon 3 of 5		NP_001317272.1	Q9GZX7-2Q7Z599
AICDA	NM_001410970.1 link	c.169G>A	p.Val57Met	missense_variant	Exon 3 of 4		NP_001397899.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AICDA	ENST00000229335.11 link	c.169G>A	p.Val57Met	missense_variant	Exon 3 of 5	1	NM_020661.4	ENSP00000229335.6		Q9GZX7-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461890

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727246

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000232

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1112010

Other (OTH)

AF:

0.00

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00000534

Hom.:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hyper-IgM syndrome type 2

Pathogenic:2

Apr 30, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: AICDA c.169G>A (p.Val57Met) results in a conservative amino acid change located in the APOBEC-like, N-terminal domain (IPR013158) of the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant was absent in 248508 control chromosomes. c.169G>A has been observed in multiple homozygous individuals affected with Hyper IgM Syndrome Type 2 (Al-Mousa2016, Al-Herz_2018). These data indicate that the variant is very likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 30697212, 26915675). ClinVar contains an entry for this variant (Variation ID: 191031). Based on the evidence outlined above, the variant was classified as pathogenic. -

Mar 17, 2024

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:research

- -

not provided

Pathogenic:1

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance:Likely pathogenic

Review Status:flagged submission

Collection Method:research

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.92

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Uncertain

-0.070

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.40

T;.

Eigen

Uncertain

0.65

Eigen_PC

Uncertain

0.60

FATHMM_MKL

Uncertain

0.92

LIST_S2

Pathogenic

0.98

D;D

M_CAP

Benign

0.078

MetaRNN

Pathogenic

0.95

D;D

MetaSVM

Uncertain

-0.054

MutationAssessor

Uncertain

2.5

M;M

PhyloP100

4.3

PrimateAI

Uncertain

0.68

PROVEAN

Benign

-1.5

N;N

REVEL

Uncertain

0.40

Sift

Uncertain

0.025

D;D

Sift4G

Benign

0.070

T;T

Polyphen

1.0

D;.

Vest4

0.89

MutPred

0.83

Gain of methylation at K52 (P = 0.1651);Gain of methylation at K52 (P = 0.1651);

MVP

0.79

MPC

1.9

ClinPred

0.95

GERP RS

5.4

Varity_R

0.85

gMVP

0.90

Mutation Taster

=9/91

disease causing (ClinVar)

(source)

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

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over