20-44621103-G-C

Variant names:

• chr20-44621103-G-C
• NM_000022.4:c.890C>G

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2 PM5 PP3_Strong

The NM_000022.4(ADA):​c.890C>G​(p.Pro297Arg) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,878 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P297Q) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: ADA NM_000022.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.50

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]

PKIG (HGNC:9019): (cAMP-dependent protein kinase inhibitor gamma) This gene encodes a member of the protein kinase inhibitor family. Studies of a similar protein in mice suggest that this protein acts as a potent competitive cAMP-dependent protein kinase inhibitor, and is a predominant form of inhibitor in various tissues. The encoded protein may be involved in osteogenesis. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2013]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr20-44621103-G-T is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.987

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ADA	NM_000022.4	c.890C>G	p.Pro297Arg	missense_variant	Exon 10 of 12	ENST00000372874.9	NP_000013.2
ADA	NM_001322051.2	c.818C>G	p.Pro273Arg	missense_variant	Exon 9 of 11		NP_001308980.1
ADA	NM_001322050.2	c.485C>G	p.Pro162Arg	missense_variant	Exon 9 of 11		NP_001308979.1
ADA	NR_136160.2	n.917C>G		non_coding_transcript_exon_variant	Exon 9 of 11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ADA	ENST00000372874.9	c.890C>G	p.Pro297Arg	missense_variant	Exon 10 of 12	1	NM_000022.4	ENSP00000361965.4
ADA	ENST00000695995.1	c.500C>G	p.Pro167Arg	missense_variant	Exon 7 of 9			ENSP00000512318.1
ADA	ENST00000695991.1	c.428C>G	p.Pro143Arg	missense_variant	Exon 6 of 8			ENSP00000512314.1
ADA	ENST00000695956.1	c.44C>G	p.Pro15Arg	missense_variant	Exon 1 of 3			ENSP00000512285.1
ADA	ENST00000696038.1	n.*647C>G		non_coding_transcript_exon_variant	Exon 8 of 9			ENSP00000512344.1
ADA	ENST00000696038.1	n.*647C>G		3_prime_UTR_variant	Exon 8 of 9			ENSP00000512344.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461878 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727238

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.81
BayesDel_addAF	Pathogenic	0.51	D
BayesDel_noAF	Pathogenic	0.50
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.95	D;D
Eigen	Uncertain	0.51
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.95	D;D
M_CAP	Uncertain	0.24	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	0.89	D
MutationAssessor	Benign	1.5	L;.
PrimateAI	Uncertain	0.61	T
PROVEAN	Pathogenic	-6.4	D;D
REVEL	Pathogenic	0.84
Sift	Uncertain	0.0020	D;D
Sift4G	Benign	0.070	T;T
Polyphen		1.0	D;.
Vest4		0.92
MutPred		0.95		Loss of ubiquitination at K301 (P = 0.1191);.;
MVP		0.96
MPC		0.64
ClinPred		1.0	D
GERP RS		5.0
Varity_R		0.93
gMVP		0.98

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-43249744;