22-17207254-G-A

Variant names:

• chr22-17207254-G-A
• rs755786336
• NM_001282225.2:c.359C>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM1

The NM_001282225.2(ADA2):​c.359C>T​(p.Thr120Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000596 in 1,459,144 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000060 (0 hom.)
• Consequence: ADA2 NM_001282225.2 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 0.813
• 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: Uncertain_significance. The variant received 2 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 10 uncertain in NM_001282225.2

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ADA2	NM_001282225.2	c.359C>T	p.Thr120Ile	missense_variant	Exon 3 of 10	ENST00000399837.8	NP_001269154.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ADA2	ENST00000399837.8	c.359C>T	p.Thr120Ile	missense_variant	Exon 3 of 10	1	NM_001282225.2	ENSP00000382731.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.0000159 AC: 4 AN: 251328 AF XY: 0.0000221

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000264

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000596 AC: 87 AN: 1459144 Hom.: 0 Cov.: 31 AF XY: 0.0000538 AC XY: 39 AN XY: 725246

African (AFR) AF: 0.00 AC: 0 AN: 33448

American (AMR) AF: 0.0000224 AC: 1 AN: 44684

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26120

East Asian (EAS) AF: 0.00 AC: 0 AN: 39614

South Asian (SAS) AF: 0.00 AC: 0 AN: 86214

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53398

Middle Eastern (MID) AF: 0.000178 AC: 1 AN: 5618

European-Non Finnish (NFE) AF: 0.0000739 AC: 82 AN: 1109830

Other (OTH) AF: 0.0000498 AC: 3 AN: 60218

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000312 Hom.: 0

Bravo AF: 0.0000113

ExAC AF: 0.0000165 AC: 2

EpiCase AF: 0.0000545

EpiControl AF: 0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Vasculitis due to ADA2 deficiency Uncertain:1

Jul 30, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 120 of the ADA2 protein (p.Thr120Ile). This variant is present in population databases (rs755786336, gnomAD 0.003%). This variant has not been reported in the literature in individuals affected with ADA2-related conditions. ClinVar contains an entry for this variant (Variation ID: 578206). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not provided Uncertain:1

Aug 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ADA2: PM2, BP4 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.51
BayesDel_addAF	Uncertain	0.055	T
BayesDel_noAF	Uncertain	-0.080
CADD	Benign	13
DANN	Uncertain	0.99
DEOGEN2	Benign	0.16	T;T;T;T;.;.;.;T
Eigen	Benign	-0.83
Eigen_PC	Benign	-0.93
FATHMM_MKL	Benign	0.085	N
LIST_S2	Benign	0.82	.;.;.;T;.;T;T;T
M_CAP	Uncertain	0.095	D
MetaRNN	Uncertain	0.42	T;T;T;T;T;T;T;T
MetaSVM	Uncertain	-0.19	T
PhyloP100		0.81
PrimateAI	Uncertain	0.49	T
PROVEAN	Uncertain	-2.7	D;D;D;.;D;.;D;D
REVEL	Uncertain	0.37
Sift	Uncertain	0.016	D;D;D;.;D;.;D;D
Sift4G	Uncertain	0.021	D;D;D;.;D;.;D;.
Polyphen		0.60	P;P;P;P;.;.;.;.
Vest4		0.36
MutPred		0.72		Gain of sheet (P = 0.0827);Gain of sheet (P = 0.0827);Gain of sheet (P = 0.0827);Gain of sheet (P = 0.0827);.;.;Gain of sheet (P = 0.0827);Gain of sheet (P = 0.0827);
MVP		0.56
MPC		0.089
ClinPred		0.11	T
GERP RS		-0.013
Varity_R		0.083
gMVP		0.60
Mutation Taster		=88/12	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: rs755786336; hg19: chr22-17688144;