NM_001082971.2(DDC):c.486A>C (p.Lys162Asn) AND Deficiency of aromatic-L-amino-acid decarboxylase

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: May 14, 2021
Review status:: 1 star out of maximum of 4 stars
criteria provided, single submitter

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV001994038.6

Allele description [Variation Report for NM_001082971.2(DDC):c.486A>C (p.Lys162Asn)]

NM_001082971.2(DDC):c.486A>C (p.Lys162Asn)

Gene:

DDC:dopa decarboxylase [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

7p12.1

Genomic location:

Preferred name:

NM_001082971.2(DDC):c.486A>C (p.Lys162Asn)

HGVS:

NC_000007.14:g.50529292T>G
NG_008742.1:g.41165A>C
NM_000790.4:c.486A>C
NM_001082971.2:c.486A>CMANE SELECT
NM_001242886.2:c.372A>C
NM_001242887.2:c.486A>C
NM_001242888.2:c.252A>C
NM_001242889.2:c.435+8568A>C
NM_001242890.2:c.486A>C
NP_000781.2:p.Lys162Asn
NP_001076440.2:p.Lys162Asn
NP_001229815.2:p.Lys124Asn
NP_001229816.2:p.Lys162Asn
NP_001229817.2:p.Lys84Asn
NP_001229819.2:p.Lys162Asn
NC_000007.13:g.50596990T>G

Protein change:

K124N

Links:

dbSNP: rs764518800

NCBI 1000 Genomes Browser:

rs764518800

Molecular consequence:

NM_001242889.2:c.435+8568A>C - intron variant - [Sequence Ontology: SO:0001627]
NM_000790.4:c.486A>C - missense variant - [Sequence Ontology: SO:0001583]
NM_001082971.2:c.486A>C - missense variant - [Sequence Ontology: SO:0001583]
NM_001242886.2:c.372A>C - missense variant - [Sequence Ontology: SO:0001583]
NM_001242887.2:c.486A>C - missense variant - [Sequence Ontology: SO:0001583]
NM_001242888.2:c.252A>C - missense variant - [Sequence Ontology: SO:0001583]
NM_001242890.2:c.486A>C - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Deficiency of aromatic-L-amino-acid decarboxylase
Synonyms:: DDC deficiency; Aromatic amino acid decarboxylase deficiency; Dopa decarboxylase deficiency
Identifiers:: MONDO: MONDO:0012084; MedGen: C1291564; Orphanet: 35708; OMIM: 608643

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV002260090	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (May 14, 2021)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV002260090

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(May 14, 2021)

germline

clinical testing

PubMed (1)
[See all records that cite this PMID]

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group., Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11. Erratum in: Genet Med. 2020 Jan;22(1):240. doi: 10.1038/s41436-019-0624-9.

PubMed [citation]

PMID:: 28492532
PMCID:: PMC5632818

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV002260090.3

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

Description

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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with DDC-related conditions. This variant is present in population databases (rs764518800, ExAC 0.01%). This sequence change replaces lysine with asparagine at codon 162 of the DDC protein (p.Lys162Asn). The lysine residue is highly conserved and there is a moderate physicochemical difference between lysine and asparagine.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Sep 29, 2024

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