22-17181876-A-G

Variant names:

• chr22-17181876-A-G
• rs373797039
• NM_001282225.2:c.1386T>C

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_Strong BP6 BP7

The NM_001282225.2(ADA2):​c.1386T>C​(p.Ile462Ile) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000102 in 1,614,116 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00048 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000063 (0 hom.)
• Consequence: ADA2 NM_001282225.2 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:3
• Conservation: PhyloP100: -0.998
• Publications: 0 publications found

Genes affected

ADA2 (HGNC:1839): (adenosine deaminase 2) This gene encodes a member of a subfamily of the adenosine deaminase protein family. The encoded protein is one of two adenosine deaminases found in humans, which regulate levels of the signaling molecule, adenosine. The encoded protein is secreted from monocytes undergoing differentiation and may regulate cell proliferation and differentiation. This gene may be responsible for some of the phenotypic features associated with cat eye syndrome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2013]

ADA2 Gene-Disease associations (from GenCC):

• deficiency of adenosine deaminase 2

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• vasculitis due to ADA2 deficiency

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, Labcorp Genetics (formerly Invitae)
• polyarteritis nodosa

  Inheritance: AR Classification: MODERATE Submitted by: Genomics England PanelApp
• Sneddon syndrome

  Inheritance: AR, AD Classification: MODERATE, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet
• Diamond-Blackfan anemia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -6 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.49).
• BP6: Variant 22-17181876-A-G is Benign according to our data. Variant chr22-17181876-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 474906.
• BP7: Synonymous conserved (PhyloP=-0.998 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001282225.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ADA2	NM_001282225.2	MANE Select	c.1386T>C	p.Ile462Ile	synonymous	Exon 9 of 10	NP_001269154.1
	ADA2	NM_001282226.2		c.1386T>C	p.Ile462Ile	synonymous	Exon 9 of 10	NP_001269155.1
	ADA2	NM_001282227.2		c.1260T>C	p.Ile420Ile	synonymous	Exon 9 of 10	NP_001269156.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ADA2	ENST00000399837.8	TSL:1 MANE Select	c.1386T>C	p.Ile462Ile	synonymous	Exon 9 of 10	ENSP00000382731.2
	ADA2	ENST00000262607.3	TSL:1	c.1386T>C	p.Ile462Ile	synonymous	Exon 8 of 9	ENSP00000262607.2
	ADA2	ENST00000885359.1		c.1503T>C	p.Ile501Ile	synonymous	Exon 10 of 11	ENSP00000555418.1

Frequencies

GnomAD3 genomes AF: 0.000480 AC: 73 AN: 152182 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.0647

Gnomad AMR AF: 0.000196

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: 0.000162

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000437 AC: 11 AN: 251456 AF XY: 0.0000442

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000578

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000791

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000629 AC: 92 AN: 1461816 Hom.: 0 Cov.: 33 AF XY: 0.0000674 AC XY: 49 AN XY: 727208

African (AFR) AF: 0.0000299 AC: 1 AN: 33480

American (AMR) AF: 0.0000671 AC: 3 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.000175 AC: 1 AN: 5730

European-Non Finnish (NFE) AF: 0.0000764 AC: 85 AN: 1111980

Other (OTH) AF: 0.0000331 AC: 2 AN: 60392

GnomAD4 genome AF: 0.000479 AC: 73 AN: 152300 Hom.: 0 Cov.: 33 AF XY: 0.000524 AC XY: 39 AN XY: 74474

African (AFR) AF: 0.00 AC: 0 AN: 41570

American (AMR) AF: 0.000196 AC: 3 AN: 15298

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5178

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10624

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.000162 AC: 11 AN: 68014

Other (OTH) AF: 0.00 AC: 0 AN: 2112

Alfa AF: 0.000193 Hom.: 0

Bravo AF: 0.000767

EpiCase AF: 0.000273

EpiControl AF: 0.000119

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	-	1	ADA2-related disorder (1)
-	1	-	Autoinflammatory syndrome (1)
-	-	1	not provided (1)
-	-	1	Vasculitis due to ADA2 deficiency (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.49
CADD	Benign	1.2
DANN	Benign	0.79
PhyloP100		-1.0
Mutation Taster		=100/0	polymorphism

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

Other links and lift over

dbSNP: rs373797039; hg19: chr22-17662766;