Genetic Variant AANAT:p.Arg128Pro (chr17-76469729-G-C) – 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.383G>C(p.Arg128Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000428 in 1,401,202 control chromosomes in the GnomAD database, with no homozygous occurrence. 15/22 in silico tools predict a benign 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. R128H) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000043 ( 0 hom. )

Consequence

AANAT
NM_001088.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.74

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:

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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
AANAT	NM_001088.3 link	c.383G>C	p.Arg128Pro	missense_variant	Exon 4 of 4	ENST00000392492.8	NP_001079.1	Q16613-1F1T0I5
AANAT	NM_001166579.2 link	c.518G>C	p.Arg173Pro	missense_variant	Exon 7 of 7		NP_001160051.1	Q16613-2
AANAT	NR_110548.2 link	n.639G>C		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.383G>C	p.Arg128Pro	missense_variant	Exon 4 of 4	1	NM_001088.3	ENSP00000376282.2		Q16613-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000428

AC:

AN:

1401202

Hom.:

Cov.:

AF XY:

0.00000145

AC XY:

AN XY:

690362

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32234

American (AMR)

AF:

0.00

AC:

AN:

37944

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23478

East Asian (EAS)

AF:

0.00

AC:

AN:

37924

South Asian (SAS)

AF:

0.00

AC:

AN:

78224

European-Finnish (FIN)

AF:

0.00

AC:

AN:

47750

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5140

European-Non Finnish (NFE)

AF:

0.00000555

AC:

AN:

1080786

Other (OTH)

AF:

0.00

AC:

AN:

57722

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.467

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.16

BayesDel_addAF

Benign

-0.11

BayesDel_noAF

Benign

-0.40

CADD

Benign

(source)

DANN

Benign

0.93

DEOGEN2

Benign

0.12

.;T

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.74

LIST_S2

Uncertain

0.96

D;D

M_CAP

Benign

0.047

MetaRNN

Uncertain

0.66

D;D

MetaSVM

Benign

-0.98

MutationAssessor

Benign

0.33

.;N

PhyloP100

1.7

PrimateAI

Benign

0.20

PROVEAN

Benign

-0.20

N;N

REVEL

Benign

0.26

Sift

Benign

0.29

T;T

Sift4G

Benign

0.22

T;T

Polyphen

0.30

.;B

Vest4

0.59

MutPred

0.59

.;Loss of MoRF binding (P = 6e-04);

MVP

0.16

MPC

0.34

ClinPred

0.63

GERP RS

-4.1

Varity_R

0.28

gMVP

0.74

Mutation Taster

=83/17

polymorphism

(source)

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

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chr17-76469729-G-C

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

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