chr20-44642751-C-T

Variant names:

• chr20-44642751-C-T
• rs406383
• NM_000022.4:c.34-6463G>A

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BS1 BS2

The NM_000022.4(ADA):​c.34-6463G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00495 in 152,064 control chromosomes in the GnomAD database, including 7 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 0.0050 (7 hom., cov: 32)
• Consequence: ADA NM_000022.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.959
• Publications: 9 publications found

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

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00495 (753/152064) while in subpopulation AFR AF = 0.0161 (669/41514). AF 95% confidence interval is 0.0151. There are 7 homozygotes in GnomAd4. There are 358 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 7 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000022.4. 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
	ADA	NM_000022.4	MANE Select	c.34-6463G>A		intron	N/A	NP_000013.2
	ADA	NM_001322051.2		c.34-6463G>A		intron	N/A	NP_001308980.1
	ADA	NM_001322050.2		c.-256-6463G>A		intron	N/A	NP_001308979.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ADA	ENST00000372874.9	TSL:1 MANE Select	c.34-6463G>A		intron	N/A	ENSP00000361965.4
	ADA	ENST00000537820.2	TSL:1	c.34-6463G>A		intron	N/A	ENSP00000441818.1
	ADA	ENST00000695995.1		c.34-6463G>A		intron	N/A	ENSP00000512318.1

Frequencies

GnomAD3 genomes AF: 0.00488 AC: 742 AN: 151946 Hom.: 6 Cov.: 32

Gnomad AFR AF: 0.0160

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00315

Gnomad ASJ AF: 0.00144

Gnomad EAS AF: 0.00193

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.0127

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.00527

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

GnomAD4 genome AF: 0.00495 AC: 753 AN: 152064 Hom.: 7 Cov.: 32 AF XY: 0.00482 AC XY: 358 AN XY: 74316

African (AFR) AF: 0.0161 AC: 669 AN: 41514

American (AMR) AF: 0.00314 AC: 48 AN: 15272

Ashkenazi Jewish (ASJ) AF: 0.00144 AC: 5 AN: 3466

East Asian (EAS) AF: 0.00194 AC: 10 AN: 5156

South Asian (SAS) AF: 0.00 AC: 0 AN: 4814

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10558

Middle Eastern (MID) AF: 0.0136 AC: 4 AN: 294

European-Non Finnish (NFE) AF: 0.0000441 AC: 3 AN: 67968

Other (OTH) AF: 0.00664 AC: 14 AN: 2110

Alfa AF: 0.00 Hom.: 171

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	0.71
DANN	Benign	0.67
PhyloP100		-0.96
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: rs406383; hg19: chr20-43271392;