rs200450773

Variant names:

• chr7-50463239-T-C
• rs200450773
• NM_001082971.2:c.1435A>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 3P and 5B. PM2 PP2 BP4_Strong BP6

The NM_001082971.2(DDC):​c.1435A>G​(p.Arg479Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000135 in 1,612,108 control chromosomes in the GnomAD database, with no homozygous occurrence. 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R479K) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.00015 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00013 (0 hom.)
• Consequence: DDC NM_001082971.2 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:3
• Conservation: PhyloP100: -0.219
• 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 Gene-Disease associations (from GenCC):

• aromatic L-amino acid decarboxylase deficiency

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen, Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• 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=0.0046794116).
• BP6: Variant 7-50463239-T-C is Benign according to our data. Variant chr7-50463239-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 1115481.

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.1435A>G	p.Arg479Gly	missense	Exon 14 of 15	NP_001076440.2	A0A0S2Z3N4
	DDC	NM_000790.4		c.1435A>G	p.Arg479Gly	missense	Exon 14 of 15	NP_000781.2	P20711-1
	DDC	NM_001242886.2		c.1321A>G	p.Arg441Gly	missense	Exon 13 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.1435A>G	p.Arg479Gly	missense	Exon 14 of 15	ENSP00000403644.2	P20711-1
	DDC	ENST00000357936.9	TSL:1	c.1435A>G	p.Arg479Gly	missense	Exon 14 of 15	ENSP00000350616.5	P20711-1
	DDC	ENST00000897740.1		c.1579A>G	p.Arg527Gly	missense	Exon 15 of 16	ENSP00000567799.1

Frequencies

GnomAD3 genomes AF: 0.000151 AC: 23 AN: 152206 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000262

Gnomad ASJ AF: 0.00403

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.000478

GnomAD2 exomes AF: 0.000287 AC: 71 AN: 247022 AF XY: 0.000277

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000176

Gnomad ASJ exome AF: 0.00522

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000116

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000133 AC: 194 AN: 1459784 Hom.: 0 Cov.: 32 AF XY: 0.000125 AC XY: 91 AN XY: 725978

African (AFR) AF: 0.00 AC: 0 AN: 33438

American (AMR) AF: 0.000135 AC: 6 AN: 44420

Ashkenazi Jewish (ASJ) AF: 0.00479 AC: 125 AN: 26086

East Asian (EAS) AF: 0.00 AC: 0 AN: 39658

South Asian (SAS) AF: 0.00 AC: 0 AN: 85750

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53314

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5600

European-Non Finnish (NFE) AF: 0.0000342 AC: 38 AN: 1111210

Other (OTH) AF: 0.000415 AC: 25 AN: 60308

GnomAD4 genome AF: 0.000151 AC: 23 AN: 152324 Hom.: 0 Cov.: 32 AF XY: 0.000148 AC XY: 11 AN XY: 74502

African (AFR) AF: 0.0000241 AC: 1 AN: 41566

American (AMR) AF: 0.000261 AC: 4 AN: 15302

Ashkenazi Jewish (ASJ) AF: 0.00403 AC: 14 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5188

South Asian (SAS) AF: 0.00 AC: 0 AN: 4828

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10628

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000441 AC: 3 AN: 68020

Other (OTH) AF: 0.000473 AC: 1 AN: 2114

Alfa AF: 0.000439 Hom.: 1

Bravo AF: 0.000174

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000465 AC: 4

ExAC AF: 0.000198 AC: 24

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	1	Deficiency of aromatic-L-amino-acid decarboxylase (2)
-	-	1	DDC-related disorder (1)
-	1	-	Global developmental delay (1)
-	-	1	Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.065
BayesDel_addAF	Benign	-0.40	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	2.1
DANN	Benign	0.84
DEOGEN2	Benign	0.14	T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.061	N
LIST_S2	Benign	0.76	T
M_CAP	Benign	0.0042	T
MetaRNN	Benign	0.0047	T
MetaSVM	Benign	-0.98	T
MutationAssessor	Benign	1.4	L
PhyloP100		-0.22
PrimateAI	Benign	0.25	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.053
Sift	Benign	0.078	T
Sift4G	Benign	0.073	T
Polyphen		0.0	B
Vest4		0.084
MVP		0.30
MPC		0.36
ClinPred		0.016	T
GERP RS		0.62
Varity_R		0.32
gMVP		0.67
Mutation Taster		=91/9	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: rs200450773; hg19: chr7-50530937;