rs11575553

Positions:

• chr7-50458521-G-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The ENST00000444124.7(DDC):​c.*341C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0794 in 152,230 control chromosomes in the GnomAD database, including 704 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.079 (704 hom., cov: 33)
  • Failed GnomAD Quality Control
• Consequence: DDC ENST00000444124.7 3_prime_UTR
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -0.749

Genes affected

DDC (HGNC:2719): (dopa decarboxylase) The encoded protein catalyzes the decarboxylation of L-3,4-dihydroxyphenylalanine (DOPA) to dopamine, L-5-hydroxytryptophan to serotonin and L-tryptophan to tryptamine. Defects in this gene are the cause of aromatic L-amino-acid decarboxylase deficiency (AADCD). AADCD deficiency is an inborn error in neurotransmitter metabolism that leads to combined serotonin and catecholamine deficiency. Multiple alternatively spliced transcript variants encoding different isoforms have been identified for this gene. [provided by RefSeq, Jun 2011]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.92).
• BP6: Variant 7-50458521-G-A is Benign according to our data. Variant chr7-50458521-G-A is described in ClinVar as [Benign]. Clinvar id is 360423.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (SAS) allele frequency at 95% confidence interval = 0.098 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DDC	NM_001082971.2	c.*341C>T		3_prime_UTR_variant	15/15	ENST00000444124.7	NP_001076440.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DDC	ENST00000444124.7	c.*341C>T		3_prime_UTR_variant	15/15	1	NM_001082971.2	ENSP00000403644	P1

Frequencies

GnomAD3 genomes AF: 0.0794 AC: 12079 AN: 152112 Hom.: 702 Cov.: 33

Gnomad AFR AF: 0.0245

Gnomad AMI AF: 0.0515

Gnomad AMR AF: 0.0971

Gnomad ASJ AF: 0.0545

Gnomad EAS AF: 0.0707

Gnomad SAS AF: 0.105

Gnomad FIN AF: 0.198

Gnomad MID AF: 0.0411

Gnomad NFE AF: 0.0914

Gnomad OTH AF: 0.0708

GnomAD4 exome Data not reliable, filtered out with message: AC0 AC: 0 AN: 0 Hom.: 0 Cov.: 0 AC XY: 0 AN XY: 0

GnomAD4 genome AF: 0.0794 AC: 12083 AN: 152230 Hom.: 704 Cov.: 33 AF XY: 0.0853 AC XY: 6346 AN XY: 74426

Gnomad4 AFR AF: 0.0244

Gnomad4 AMR AF: 0.0973

Gnomad4 ASJ AF: 0.0545

Gnomad4 EAS AF: 0.0711

Gnomad4 SAS AF: 0.106

Gnomad4 FIN AF: 0.198

Gnomad4 NFE AF: 0.0914

Gnomad4 OTH AF: 0.0696

Alfa AF: 0.0853 Hom.: 630

Bravo AF: 0.0707

Asia WGS AF: 0.0690 AC: 240 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:1

Benign, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

-

- -

Deficiency of aromatic-L-amino-acid decarboxylase Benign:1

Benign, 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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.92
CADD	Benign	0.22
DANN	Benign	0.32

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: rs11575553; hg19: chr7-50526219;