chr9-133656604-G-A

Position:

• chr9-133656604-G-A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2 BP4_Strong BS1_Supporting

The ENST00000393056.8(DBH):​c.1516G>A​(p.Ala506Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000494 in 1,613,536 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.00049 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00049 (0 hom.)
• Consequence: DBH ENST00000393056.8 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 0.902

Genes affected

DBH (HGNC:2689): (dopamine beta-hydroxylase) The protein encoded by this gene is an oxidoreductase belonging to the copper type II, ascorbate-dependent monooxygenase family. The encoded protein, expressed in neuroscretory vesicles and chromaffin granules of the adrenal medulla, catalyzes the conversion of dopamine to norepinephrine, which functions as both a hormone and as the main neurotransmitter of the sympathetic nervous system. The enzyme encoded by this gene exists exists in both soluble and membrane-bound forms, depending on the absence or presence, respectively, of a signal peptide. Mutations in this gene cause dopamine beta-hydroxylate deficiency in human patients, characterized by deficits in autonomic and cardiovascular function, including hypotension and ptosis. Polymorphisms in this gene may play a role in a variety of psychiatric disorders. [provided by RefSeq, Aug 2017]

DBH-AS1 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.016807258).
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000486 (74/152318) while in subpopulation AMR AF= 0.00242 (37/15308). AF 95% confidence interval is 0.0018. There are 0 homozygotes in gnomad4. There are 36 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DBH	NM_000787.4	c.1516G>A	p.Ala506Thr	missense_variant	10/12	ENST00000393056.8	NP_000778.3
DBH-AS1	NR_102735.1	n.283-67C>T		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DBH	ENST00000393056.8	c.1516G>A	p.Ala506Thr	missense_variant	10/12	1	NM_000787.4	ENSP00000376776.2
DBH-AS1	ENST00000425189.1	n.188-67C>T		intron_variant		1

Frequencies

GnomAD3 genomes AF: 0.000480 AC: 73 AN: 152200 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00235

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0000942

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000441

Gnomad OTH AF: 0.00191

GnomAD3 exomes AF: 0.000336 AC: 84 AN: 250332 Hom.: 0 AF XY: 0.000325 AC XY: 44 AN XY: 135504

Gnomad AFR exome AF: 0.000124

Gnomad AMR exome AF: 0.000174

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000109

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000943

Gnomad NFE exome AF: 0.000583

Gnomad OTH exome AF: 0.000980

GnomAD4 exome AF: 0.000495 AC: 723 AN: 1461218 Hom.: 0 Cov.: 31 AF XY: 0.000495 AC XY: 360 AN XY: 726902

Gnomad4 AFR exome AF: 0.000119

Gnomad4 AMR exome AF: 0.000313

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000504

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.0000758

Gnomad4 NFE exome AF: 0.000600

Gnomad4 OTH exome AF: 0.000513

GnomAD4 genome AF: 0.000486 AC: 74 AN: 152318 Hom.: 0 Cov.: 33 AF XY: 0.000483 AC XY: 36 AN XY: 74474

Gnomad4 AFR AF: 0.0000481

Gnomad4 AMR AF: 0.00242

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.0000942

Gnomad4 NFE AF: 0.000441

Gnomad4 OTH AF: 0.00189

Alfa AF: 0.000384 Hom.: 0

Bravo AF: 0.000737

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.000519 AC: 2

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000698 AC: 6

ExAC AF: 0.000412 AC: 50

EpiCase AF: 0.000436

EpiControl AF: 0.000711

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Orthostatic hypotension 1 Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 21, 2022	This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 506 of the DBH protein (p.Ala506Thr). This variant is present in population databases (rs148439785, gnomAD 0.06%). This variant has not been reported in the literature in individuals affected with DBH-related conditions. ClinVar contains an entry for this variant (Variation ID: 365664). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The threonine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.081
BayesDel_addAF	Benign	-0.41	T
BayesDel_noAF	Benign	-0.46
CADD	Benign	12
DANN	Uncertain	0.98
DEOGEN2	Benign	0.36	T
Eigen	Benign	-0.95
Eigen_PC	Benign	-0.99
FATHMM_MKL	Benign	0.098	N
LIST_S2	Benign	0.75	T
M_CAP	Benign	0.0087	T
MetaRNN	Benign	0.017	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.1	L
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-1.2	N
REVEL	Benign	0.15
Sift	Benign	0.24	T
Sift4G	Benign	0.18	T
Polyphen		0.070	B
Vest4		0.28
MVP		0.57
MPC		0.058
ClinPred		0.014	T
GERP RS		-0.97
Varity_R		0.13
gMVP		0.67

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

LitVar

Other links and lift over

dbSNP: rs148439785; hg19: chr9-136521726;