chr21-45176080-A-G

Position:

• chr21-45176080-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP2 PP3_Moderate PP5

The NM_001112.4(ADARB1):​c.379A>G​(p.Lys127Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ADARB1 NM_001112.4 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 8.89

Genes affected

ADARB1 (HGNC:226): (adenosine deaminase RNA specific B1) This gene encodes the enzyme responsible for pre-mRNA editing of the glutamate receptor subunit B by site-specific deamination of adenosines. Studies in rat found that this enzyme acted on its own pre-mRNA molecules to convert an AA dinucleotide to an AI dinucleotide which resulted in a new splice site. Alternative splicing of this gene results in several transcript variants, some of which have been characterized by the presence or absence of an ALU cassette insert and a short or long C-terminal region. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), ADARB1. . Trascript score misZ 3.725 (greater than threshold 3.09). GenCC has associacion of gene with neurodevelopmental disorder with hypotonia, microcephaly, and seizures.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.911
• PP5: Variant 21-45176080-A-G is Pathogenic according to our data. Variant chr21-45176080-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 870451.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr21-45176080-A-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ADARB1	NM_001112.4	c.379A>G	p.Lys127Glu	missense_variant	4/11	ENST00000348831.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ADARB1	ENST00000348831.9	c.379A>G	p.Lys127Glu	missense_variant	4/11	1	NM_001112.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Neurodevelopmental disorder with hypotonia, microcephaly, and seizures Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Apr 30, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.45	D
BayesDel_noAF	Pathogenic	0.41
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.81	D;.;.;.;.;D
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.88
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D;D;D;D;.
M_CAP	Pathogenic	0.58	D
MetaRNN	Pathogenic	0.91	D;D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	4.7	H;H;H;.;.;H
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Pathogenic	0.81	D
PROVEAN	Uncertain	-3.4	.;D;D;D;.;D
REVEL	Pathogenic	0.88
Sift	Uncertain	0.0010	.;D;D;D;.;D
Sift4G	Uncertain	0.0040	D;D;D;D;D;D
Polyphen		1.0	D;D;.;.;.;D
Vest4		0.84
MutPred		0.71		Loss of MoRF binding (P = 0.0073);Loss of MoRF binding (P = 0.0073);Loss of MoRF binding (P = 0.0073);Loss of MoRF binding (P = 0.0073);.;Loss of MoRF binding (P = 0.0073);
MVP		0.90
ClinPred		0.99	D
GERP RS		5.2
Varity_R		0.80
gMVP		0.91

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

Publications

LitVar

Other links and lift over

dbSNP: rs2091682680; hg19: chr21-46595995;