Genetic Variant AANAT:p.Ser172Cys (chr17-76469860-A-T) – 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_001088.3(AANAT):c.514A>T(p.Ser172Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000562 in 1,601,618 control chromosomes in the GnomAD database, with no homozygous occurrence. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000048 ( 0 hom. )

Consequence

AANAT
NM_001088.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.53

Publications

0 publications found

Variant links:

Genes affected

AANAT (HGNC:19): (aralkylamine N-acetyltransferase) The protein encoded by this gene belongs to the acetyltransferase superfamily. It is the penultimate enzyme in melatonin synthesis and controls the night/day rhythm in melatonin production in the vertebrate pineal gland. Melatonin is essential for the function of the circadian clock that influences activity and sleep. This enzyme is regulated by cAMP-dependent phosphorylation that promotes its interaction with 14-3-3 proteins and thus protects the enzyme against proteasomal degradation. This gene may contribute to numerous genetic diseases such as delayed sleep phase syndrome. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2009]

AANAT links:

Genome browser will be placed here

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
AANAT	NM_001088.3 link	c.514A>T	p.Ser172Cys	missense_variant	Exon 4 of 4	ENST00000392492.8	NP_001079.1	Q16613-1F1T0I5
AANAT	NM_001166579.2 link	c.649A>T	p.Ser217Cys	missense_variant	Exon 7 of 7		NP_001160051.1	Q16613-2
AANAT	NR_110548.2 link	n.770A>T		non_coding_transcript_exon_variant	Exon 4 of 4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AANAT	ENST00000392492.8 link	c.514A>T	p.Ser172Cys	missense_variant	Exon 4 of 4	1	NM_001088.3	ENSP00000376282.2		Q16613-1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152214

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:

0.000386

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000221

AC:

AN:

226080

AF XY:

0.0000162

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000296

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000483

AC:

AN:

1449404

Hom.:

Cov.:

AF XY:

0.00000417

AC XY:

AN XY:

720074

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33286

American (AMR)

AF:

0.00

AC:

AN:

43180

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25834

East Asian (EAS)

AF:

0.000153

AC:

AN:

39134

South Asian (SAS)

AF:

0.00

AC:

AN:

84250

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51328

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4986

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1107578

Other (OTH)

AF:

0.0000167

AC:

AN:

59828

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.461

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152214

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74372

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41454

American (AMR)

AF:

0.00

AC:

AN:

15288

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.000386

AC:

AN:

5188

South Asian (SAS)

AF:

0.00

AC:

AN:

4838

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68032

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.550

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.00000828

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Mar 22, 2023

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.514A>T (p.S172C) alteration is located in exon 4 (coding exon 3) of the AANAT gene. This alteration results from a A to T substitution at nucleotide position 514, causing the serine (S) at amino acid position 172 to be replaced by a cysteine (C). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.081

BayesDel_addAF

Benign

-0.31

BayesDel_noAF

Benign

-0.38

CADD

Benign

(source)

DANN

Benign

0.95

DEOGEN2

Uncertain

0.43

.;T

Eigen

Benign

-0.24

Eigen_PC

Benign

-0.19

FATHMM_MKL

Uncertain

0.85

LIST_S2

Benign

0.72

T;T

M_CAP

Benign

0.029

MetaRNN

Uncertain

0.52

D;D

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.0

.;N

PhyloP100

7.5

PrimateAI

Benign

0.40

PROVEAN

Uncertain

-2.9

D;D

REVEL

Benign

0.25

Sift

Uncertain

0.0010

D;D

Sift4G

Uncertain

0.0020

D;D

Polyphen

0.67

.;P

Vest4

0.36

MutPred

0.73

.;Loss of sheet (P = 0.0817);

MVP

0.39

MPC

0.30

ClinPred

0.49

GERP RS

3.9

Varity_R

0.54

gMVP

0.75

Mutation Taster

=83/17

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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chr17-76469860-A-T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over