rs786205474

Variant names:

• chr12-8605473-C-T
• rs786205474
• NM_020661.4:c.169G>A

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM1 PM2 PP3_Strong PP5_Moderate

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 (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: AICDA NM_020661.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 4.29

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]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PM1: In a chain Single-stranded DNA cytosine deaminase (size 197) in uniprot entity AICDA_HUMAN there are 7 pathogenic changes around while only 1 benign (88%) in NM_020661.4
• PM2: Very rare variant in population databases, with high coverage
• 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 [Likely_pathogenic]. Clinvar id is 191031.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AICDA	NM_020661.4	c.169G>A	p.Val57Met	missense_variant	Exon 3 of 5	ENST00000229335.11	NP_065712.1
AICDA	NM_001330343.2	c.169G>A	p.Val57Met	missense_variant	Exon 3 of 5		NP_001317272.1
AICDA	NM_001410970.1	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	c.169G>A	p.Val57Met	missense_variant	Exon 3 of 5	1	NM_020661.4	ENSP00000229335.6

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461890 Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1 AN XY: 727246

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Hyper-IgM syndrome type 2 Pathogenic:1

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	D
BayesDel_noAF	Uncertain	-0.070
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Benign	0.40	T;.
Eigen	Uncertain	0.65
Eigen_PC	Uncertain	0.60
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Pathogenic	0.98	D;D
M_CAP	Benign	0.078	D
MetaRNN	Pathogenic	0.95	D;D
MetaSVM	Uncertain	-0.054	T
MutationAssessor	Uncertain	2.5	M;M
PrimateAI	Uncertain	0.68	T
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	D
GERP RS		5.4
Varity_R		0.85
gMVP		0.90

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

LitVar

Other links and lift over

dbSNP: rs786205474; hg19: chr12-8758069; COSMIC: COSV57564967;