Genetic Variant AMBN:c.532-1G>A (chr4-70602623-G-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PVS1_Moderate

The NM_016519.6(AMBN):c.532-1G>A variant causes a splice acceptor, intron change. The variant allele was found at a frequency of 0.00000384 in 1,564,514 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.0000067 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000035 ( 0 hom. )

Consequence

AMBN
NM_016519.6 splice_acceptor, intron

Scores

Splicing: ADA: 1.000

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 4.27

Publications

4 publications found

Variant links:

Genes affected

AMBN (HGNC:452): (ameloblastin) This gene encodes the nonamelogenin enamel matrix protein ameloblastin. The encoded protein may be important in enamel matrix formation and mineralization. This gene is located in the calcium-binding phosphoprotein gene cluster on chromosome 4. Mutations in this gene may be associated with dentinogenesis imperfect and autosomal dominant amylogenesis imperfect. [provided by RefSeq, Aug 2011]

AMBN Gene-Disease associations (from GenCC):

amelogenesis imperfecta type 1F
Inheritance: SD, AR Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
amelogenesis imperfecta type 1
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

AMBN links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

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

PVS1

Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.029017856 fraction of the gene. Cryptic splice site detected, with MaxEntScore 5.6, offset of 7, new splice context is: atctgtgatataactcccAGgag. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in inframe change.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AMBN	NM_016519.6 link	c.532-1G>A		splice_acceptor_variant, intron_variant	Intron 6 of 12	ENST00000322937.10	NP_057603.1	Q9NP70-1Q546D7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AMBN	ENST00000322937.10 link	c.532-1G>A		splice_acceptor_variant, intron_variant	Intron 6 of 12	1	NM_016519.6	ENSP00000313809.6		Q9NP70-1
AMBN	ENST00000449493.2 link	c.487-1G>A		splice_acceptor_variant, intron_variant	Intron 6 of 12	5		ENSP00000391234.2		Q9NP70-2

Frequencies

GnomAD3 genomes

AF:

0.00000668

AC:

AN:

149766

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000148

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000437

AC:

AN:

229080

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000613

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000353

AC:

AN:

1414748

Hom.:

Cov.:

AF XY:

0.00000427

AC XY:

AN XY:

702230

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

31972

American (AMR)

AF:

0.00

AC:

AN:

40106

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24936

East Asian (EAS)

AF:

0.0000256

AC:

AN:

39008

South Asian (SAS)

AF:

0.00

AC:

AN:

74798

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51878

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5480

European-Non Finnish (NFE)

AF:

0.00000368

AC:

AN:

1088318

Other (OTH)

AF:

0.00

AC:

AN:

58252

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.465

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.00000668

AC:

AN:

149766

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

73060

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

40238

American (AMR)

AF:

0.00

AC:

AN:

15076

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3378

East Asian (EAS)

AF:

0.00

AC:

AN:

5046

South Asian (SAS)

AF:

0.00

AC:

AN:

4680

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10414

Middle Eastern (MID)

AF:

0.00

AC:

AN:

314

European-Non Finnish (NFE)

AF:

0.0000148

AC:

AN:

67666

Other (OTH)

AF:

0.00

AC:

AN:

2060

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.00000829

AC:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.60

BayesDel_noAF

Benign

-0.57

CADD

Uncertain

(source)

DANN

Uncertain

0.98

Eigen

Uncertain

0.61

Eigen_PC

Uncertain

0.32

FATHMM_MKL

Benign

0.73

PhyloP100

4.3

GERP RS

3.6

Mutation Taster

=3/97

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.79

SpliceAI score (max)

0.70

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.47

Position offset: 8

DS_AL_spliceai

0.70

Position offset: 1

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

Computational scores

Splicing

Publications

Other links and lift over