17-76469307-G-C

Position:

• chr17-76469307-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001088.3(AANAT):​c.298G>C​(p.Asp100His) variant causes a missense change. 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: AANAT NM_001088.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.52

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.762

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AANAT	NM_001088.3	c.298G>C	p.Asp100His	missense_variant	3/4	ENST00000392492.8
AANAT	NM_001166579.2	c.433G>C	p.Asp145His	missense_variant	6/7
AANAT	NR_110548.2	n.554G>C		non_coding_transcript_exon_variant	3/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AANAT	ENST00000392492.8	c.298G>C	p.Asp100His	missense_variant	3/4	1	NM_001088.3	P1
AANAT	ENST00000250615.7	c.433G>C	p.Asp145His	missense_variant	6/7	1
AANAT	ENST00000585649.1	c.412G>C	p.Asp138His	missense_variant	2/3	1
AANAT	ENST00000587798.1	c.*75G>C		3_prime_UTR_variant, NMD_transcript_variant	3/4	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 19, 2023

The c.298G>C (p.D100H) alteration is located in exon 3 (coding exon 2) of the AANAT gene. This alteration results from a G to C substitution at nucleotide position 298, causing the aspartic acid (D) at amino acid position 100 to be replaced by a histidine (H). 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	Uncertain	0.50
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.070
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Benign	0.37	.;T;.
Eigen	Pathogenic	0.73
Eigen_PC	Uncertain	0.66
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.93	D;D;D
M_CAP	Benign	0.059	D
MetaRNN	Pathogenic	0.76	D;D;D
MetaSVM	Benign	-0.78	T
MutationAssessor	Pathogenic	3.2	.;M;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.57	T
PROVEAN	Uncertain	-3.2	D;D;.
REVEL	Uncertain	0.30
Sift	Uncertain	0.0050	D;D;.
Sift4G	Uncertain	0.010	D;D;D
Polyphen		1.0	.;D;.
Vest4		0.81
MutPred		0.61		.;Loss of sheet (P = 0.0315);.;
MVP		0.79
MPC		0.38
ClinPred		0.99	D
GERP RS		5.0
Varity_R		0.79
gMVP		0.83

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr17-74465389;