chr7-50537904-C-A

Variant names:

• chr7-50537904-C-A
• rs2044471850
• NM_001082971.2:c.391G>T

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 5P and 2B. PM1 PM2 PP2 BP4_Moderate

The NM_001082971.2(DDC):​c.391G>T​(p.Ala131Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. A131A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: DDC NM_001082971.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.291
• Publications: 0 publications found

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]

DDC-AS1 (HGNC:40171): (DDC antisense RNA 1)

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_001082971.2
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 27 curated pathogenic missense variants (we use a threshold of 10). The gene has 8 curated benign missense variants. Gene score misZ: 0.40928 (below the threshold of 3.09). Trascript score misZ: 1.0771 (below the threshold of 3.09). GenCC associations: The gene is linked to aromatic L-amino acid decarboxylase deficiency.
• BP4: Computational evidence support a benign effect (MetaRNN=0.13381201).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001082971.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DDC	NM_001082971.2	MANE Select	c.391G>T	p.Ala131Ser	missense	Exon 4 of 15	NP_001076440.2	A0A0S2Z3N4
	DDC	NM_000790.4		c.391G>T	p.Ala131Ser	missense	Exon 4 of 15	NP_000781.2	P20711-1
	DDC	NM_001242886.2		c.277G>T	p.Ala93Ser	missense	Exon 3 of 14	NP_001229815.2	A0A087WV24

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DDC	ENST00000444124.7	TSL:1 MANE Select	c.391G>T	p.Ala131Ser	missense	Exon 4 of 15	ENSP00000403644.2	P20711-1
	DDC	ENST00000357936.9	TSL:1	c.391G>T	p.Ala131Ser	missense	Exon 4 of 15	ENSP00000350616.5	P20711-1
	DDC	ENST00000380984.4	TSL:1	c.391G>T	p.Ala131Ser	missense	Exon 4 of 10	ENSP00000370371.4	P20711-2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Deficiency of aromatic-L-amino-acid decarboxylase (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.083
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.60
CADD	Benign	2.6
DANN	Benign	0.87
DEOGEN2	Benign	0.083	T
Eigen	Benign	-1.0
Eigen_PC	Benign	-0.98
FATHMM_MKL	Benign	0.081	N
LIST_S2	Benign	0.66	T
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.13	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.010	N
PhyloP100		0.29
PrimateAI	Benign	0.27	T
PROVEAN	Benign	0.24	N
REVEL	Benign	0.044
Sift	Benign	0.21	T
Sift4G	Benign	0.73	T
Polyphen		0.0090	B
Vest4		0.17
MutPred		0.34		Gain of disorder (P = 0.0432)
MVP		0.33
MPC		0.26
ClinPred		0.13	T
GERP RS		3.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.11
gMVP		0.55
Mutation Taster		=90/10	polymorphism

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

Other links and lift over

dbSNP: rs2044471850; hg19: chr7-50605602;