Genetic Variant NM_001324418.2:c.355C>G (chr7-88075657-C-G) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001324418.2(ADAM22):c.355C>G(p.His119Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,526 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. H119Y) has been classified as Benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

ADAM22
NM_001324418.2 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.818

Publications

0 publications found

Variant links:

Genes affected

ADAM22 (HGNC:201): (ADAM metallopeptidase domain 22) This gene encodes a member of the ADAM (a disintegrin and metalloprotease domain) family. Members of this family are membrane-anchored proteins structurally related to snake venom disintegrins, and have been implicated in a variety of biological processes involving cell-cell and cell-matrix interactions, including fertilization, muscle development, and neurogenesis. Unlike other members of the ADAM protein family, the protein encoded by this gene lacks metalloprotease activity since it has no zinc-binding motif. This gene is highly expressed in the brain and may function as an integrin ligand in the brain. In mice, it has been shown to be essential for correct myelination in the peripheral nervous system. Alternative splicing results in several transcript variants.[provided by RefSeq, Dec 2010]

ADAM22 Gene-Disease associations (from GenCC):

developmental and epileptic encephalopathy, 61
Inheritance: Unknown, AR Classification: STRONG, MODERATE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P

ADAM22 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ADAM22	NM_001324418.2 link	c.355C>G	p.His119Asp	missense_variant	Exon 4 of 32	ENST00000413139.2	NP_001311347.1	H7C3I4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ADAM22	ENST00000413139.2 link	c.355C>G	p.His119Asp	missense_variant	Exon 4 of 32	5	NM_001324418.2	ENSP00000412085.2		H7C3I4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461526

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727066

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:

33474

American (AMR)

AF:

0.00

AC:

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39658

South Asian (SAS)

AF:

0.00

AC:

AN:

86232

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53412

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5636

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1111900

Other (OTH)

AF:

0.00

AC:

AN:

60366

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.00000037155), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.325

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.44

BayesDel_addAF

Benign

-0.067

BayesDel_noAF

Benign

-0.33

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.043

.;T;T;.;T;.;T

Eigen

Uncertain

0.20

Eigen_PC

Benign

0.14

FATHMM_MKL

Uncertain

0.79

LIST_S2

Uncertain

0.88

D;D;D;D;D;D;D

M_CAP

Benign

0.011

MetaRNN

Uncertain

0.69

D;D;D;D;D;D;D

MetaSVM

Benign

-1.1

MutationAssessor

Pathogenic

3.1

M;.;.;M;M;M;.

PhyloP100

0.82

PrimateAI

Benign

0.47

PROVEAN

Pathogenic

-6.6

D;D;D;D;D;D;D

REVEL

Benign

0.21

Sift

Benign

0.054

T;D;D;T;D;D;T

Sift4G

Uncertain

0.0080

D;D;D;D;D;D;D

Polyphen

0.80

P;P;.;.;P;B;.

Vest4

0.70

MutPred

0.53

Gain of relative solvent accessibility (P = 0.1259);Gain of relative solvent accessibility (P = 0.1259);.;Gain of relative solvent accessibility (P = 0.1259);Gain of relative solvent accessibility (P = 0.1259);Gain of relative solvent accessibility (P = 0.1259);.;

MVP

0.64

MPC

1.3

ClinPred

0.98

GERP RS

2.3

Varity_R

0.68

gMVP

0.80

Mutation Taster

=79/21

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over