NM_000161.3(GCH1):c.571G>A (p.Val191Ile) AND multiple conditions

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: Aug 23, 2022
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:: RCV001869592.3

Allele description [Variation Report for NM_000161.3(GCH1):c.571G>A (p.Val191Ile)]

NM_000161.3(GCH1):c.571G>A (p.Val191Ile)

Gene:

GCH1:GTP cyclohydrolase 1 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

14q22.2

Genomic location:

Preferred name:

NM_000161.3(GCH1):c.571G>A (p.Val191Ile)

HGVS:

NC_000014.9:g.54845823C>T
NG_008647.1:g.62002G>A
NM_000161.3:c.571G>AMANE SELECT
NM_001024024.2:c.571G>A
NM_001024070.2:c.571G>A
NM_001024071.2:c.571G>A
NP_000152.1:p.Val191Ile
NP_001019195.1:p.Val191Ile
NP_001019241.1:p.Val191Ile
NP_001019242.1:p.Val191Ile
NC_000014.8:g.55312541C>T
NM_000161.2:c.571G>A

Protein change:

V191I

Links:

dbSNP: rs762208304

NCBI 1000 Genomes Browser:

rs762208304

Molecular consequence:

NM_000161.3:c.571G>A - missense variant - [Sequence Ontology: SO:0001583]
NM_001024024.2:c.571G>A - missense variant - [Sequence Ontology: SO:0001583]
NM_001024070.2:c.571G>A - missense variant - [Sequence Ontology: SO:0001583]
NM_001024071.2:c.571G>A - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Dystonia 5 (DRD)
Synonyms:: Dystonia, progressive, with diurnal variation; Dystonia-Parkinsonism with diurnal fluctuation; Dystonia, DOPA-responsive, with or without hyperphenylalaninemia; See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0007495; MedGen: C1851920; Orphanet: 98808; OMIM: 128230

Name:: GTP cyclohydrolase I deficiency
Identifiers:: MONDO: MONDO:0100184; MedGen: C0268467

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV002298571	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Aug 23, 2022)	germline	clinical testing	PubMed (2) [See all records that cite these PMIDs] 9778264, 28492532

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV002298571

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Aug 23, 2022)

germline

clinical testing

PubMed (2)
[See all records that cite these PMIDs]

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

Dopa-responsive dystonia: a clinical and molecular genetic study.

Bandmann O, Valente EM, Holmans P, Surtees RA, Walters JH, Wevers RA, Marsden CD, Wood NW.

Ann Neurol. 1998 Oct;44(4):649-56.

PubMed [citation]

PMID:: 9778264

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, SCV002298571.2

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (2)

Description

This sequence change replaces valine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 191 of the GCH1 protein (p.Val191Ile). This variant is present in population databases (rs762208304, gnomAD 0.002%). This missense change has been observed in individual(s) with dopa-responsive dystonia (PMID: 9778264). ClinVar contains an entry for this variant (Variation ID: 1333858). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt GCH1 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.

#	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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