12-8605325-A-G

Position:

• chr12-8605325-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PP3_Strong PP5

The NM_020661.4(AICDA):​c.317T>C​(p.Leu106Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: AICDA NM_020661.4 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 8.68

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 Likely_pathogenic. Variant got 9 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, 0.988
• PP5: Variant 12-8605325-A-G is Pathogenic according to our data. Variant chr12-8605325-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 5125.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
AICDA	NM_020661.4	c.317T>C	p.Leu106Pro	missense_variant	3/5	ENST00000229335.11	NP_065712.1
AICDA	NM_001330343.2	c.317T>C	p.Leu106Pro	missense_variant	3/5		NP_001317272.1
AICDA	NM_001410970.1	c.317T>C	p.Leu106Pro	missense_variant	3/4		NP_001397899.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
AICDA	ENST00000229335.11	c.317T>C	p.Leu106Pro	missense_variant	3/5	1	NM_020661.4	ENSP00000229335	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Hyper-IgM syndrome type 2 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Sep 01, 2000

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.36
CADD	Pathogenic	30
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.52	D;.
Eigen	Uncertain	0.53
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.95	D;D
M_CAP	Uncertain	0.26	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Uncertain	0.37	D
MutationAssessor	Pathogenic	3.6	H;H
MutationTaster	Benign	1.0	A;A
PrimateAI	Pathogenic	0.82	D
PROVEAN	Pathogenic	-6.9	D;D
REVEL	Pathogenic	0.83
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;.
Vest4		0.99
MutPred		0.97		Loss of stability (P = 0.0215);Loss of stability (P = 0.0215);
MVP		0.91
MPC		2.4
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.99
gMVP		0.99

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: rs104894321; hg19: chr12-8757921;