20-44625602-G-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2BP4_ModerateBP6

The NM_000022.4(ADA):c.445C>A(p.Arg149Arg) variant causes a synonymous change. The variant allele was found at a frequency of 0.000000696 in 1,436,750 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: not found (cov: 32)

Exomes 𝑓: 7.0e-7 ( 0 hom. )

Consequence

ADA
NM_000022.4 synonymous

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:4

Conservation

PhyloP100: 4.53

Publications

7 publications found

Variant links:

Genes affected

ADA (HGNC:186): (adenosine deaminase) This gene encodes an enzyme that catalyzes the hydrolysis of adenosine to inosine in the purine catabolic pathway. Various mutations have been described for this gene and have been linked to human diseases related to impaired immune function such as severe combined immunodeficiency disease (SCID) which is the result of a deficiency in the ADA enzyme. In ADA-deficient individuals there is a marked depletion of T, B, and NK lymphocytes, and consequently, a lack of both humoral and cellular immunity. Conversely, elevated levels of this enzyme are associated with congenital hemolytic anemia. [provided by RefSeq, Sep 2019]

ADA Gene-Disease associations (from GenCC):

severe combined immunodeficiency, autosomal recessive, T cell-negative, B cell-negative, NK cell-negative, due to adenosine deaminase deficiency
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), G2P, Myriad Women’s Health, Orphanet
Omenn syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ADA links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.32).

BP6

Variant 20-44625602-G-T is Benign according to our data. Variant chr20-44625602-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 254715.We mark this variant Benign, oryginal submissions are: {Uncertain_significance=1, Likely_benign=4}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ADA	NM_000022.4 link	c.445C>A	p.Arg149Arg	synonymous_variant	Exon 5 of 12	ENST00000372874.9	NP_000013.2	P00813A0A0S2Z381
ADA	NM_001322051.2 link	c.445C>A	p.Arg149Arg	synonymous_variant	Exon 5 of 11		NP_001308980.1	F5GWI4
ADA	NR_136160.2 link	n.537C>A		non_coding_transcript_exon_variant	Exon 5 of 11
ADA	NM_001322050.2 link	c.73+854C>A		intron_variant	Intron 4 of 10		NP_001308979.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
ADA	ENST00000372874.9 link	c.445C>A	p.Arg149Arg	synonymous_variant	Exon 5 of 12	1	NM_000022.4	ENSP00000361965.4	P00813
ADA	ENST00000696038.1 link	n.*191C>A		non_coding_transcript_exon_variant	Exon 5 of 9			ENSP00000512344.1	A0A8Q3SJ57
ADA	ENST00000696038.1 link	n.*191C>A		3_prime_UTR_variant	Exon 5 of 9			ENSP00000512344.1	A0A8Q3SJ57
ADA	ENST00000695995.1 link	c.217-2524C>A		intron_variant	Intron 3 of 8			ENSP00000512318.1	A0A8Q3SI64
ADA	ENST00000695991.1 link	c.217-2672C>A		intron_variant	Intron 3 of 7			ENSP00000512314.1	A0A0S2Z3B9

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.96e-7

AC:

AN:

1436750

Hom.:

Cov.:

AF XY:

0.00000140

AC XY:

AN XY:

712326

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33092

American (AMR)

AF:

0.00

AC:

AN:

41494

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25508

East Asian (EAS)

AF:

0.00

AC:

AN:

38690

South Asian (SAS)

AF:

0.00

AC:

AN:

82496

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51362

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4830

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1099916

Other (OTH)

AF:

0.0000168

AC:

AN:

59362

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Severe combined immunodeficiency, autosomal recessive, T cell-negative, B cell-negative, NK cell-negative, due to adenosine deaminase deficiency

Uncertain:1Benign:2

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Feb 04, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Aug 10, 2021

Genome-Nilou Lab

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not specified

Benign:2

Dec 06, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.32

CADD

Benign

8.2

(source)

DANN

Benign

0.84

PhyloP100

4.5

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.15

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over