12-8610409-G-A

Position:

• chr12-8610409-G-A

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_020661.4(AICDA):​c.8+2351C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.983 in 152,312 control chromosomes in the GnomAD database, including 73,712 homozygotes. 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: 𝑓 0.98 (73712 hom., cov: 33)
• Consequence: AICDA NM_020661.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.252

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 Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.94).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.993 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
AICDA	NM_020661.4	c.8+2351C>T		intron_variant		ENST00000229335.11	NP_065712.1
AICDA	NM_001330343.2	c.8+2351C>T		intron_variant			NP_001317272.1
AICDA	NM_001410970.1	c.8+2351C>T		intron_variant			NP_001397899.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
AICDA	ENST00000229335.11	c.8+2351C>T		intron_variant		1	NM_020661.4	ENSP00000229335.6

Frequencies

GnomAD3 genomes AF: 0.983 AC: 149679 AN: 152194 Hom.: 73660 Cov.: 33

Gnomad AFR AF: 0.942

Gnomad AMI AF: 1.00

Gnomad AMR AF: 0.995

Gnomad ASJ AF: 0.999

Gnomad EAS AF: 1.00

Gnomad SAS AF: 0.999

Gnomad FIN AF: 1.00

Gnomad MID AF: 0.987

Gnomad NFE AF: 1.00

Gnomad OTH AF: 0.988

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.983 AC: 149789 AN: 152312 Hom.: 73712 Cov.: 33 AF XY: 0.984 AC XY: 73295 AN XY: 74486

Gnomad4 AFR AF: 0.942

Gnomad4 AMR AF: 0.995

Gnomad4 ASJ AF: 0.999

Gnomad4 EAS AF: 1.00

Gnomad4 SAS AF: 0.999

Gnomad4 FIN AF: 1.00

Gnomad4 NFE AF: 1.00

Gnomad4 OTH AF: 0.988

Alfa AF: 0.990 Hom.: 9072

Bravo AF: 0.981

Asia WGS AF: 0.995 AC: 3460 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.94
CADD	Benign	2.1
DANN	Benign	0.57

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: rs1561559; hg19: chr12-8763005;