NM_000310.4(PPT1):c.65G>C (p.Arg22Pro) AND Neuronal ceroid lipofuscinosis 1

Germline classification:: Uncertain significance (2 submissions)
Last evaluated:: Nov 27, 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:: RCV001303933.7

Allele description [Variation Report for NM_000310.4(PPT1):c.65G>C (p.Arg22Pro)]

NM_000310.4(PPT1):c.65G>C (p.Arg22Pro)

Gene:

PPT1:palmitoyl-protein thioesterase 1 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

1p34.2

Genomic location:

Preferred name:

NM_000310.4(PPT1):c.65G>C (p.Arg22Pro)

HGVS:

NC_000001.11:g.40097174C>G
NG_009192.1:g.5297G>C
NM_000310.4:c.65G>CMANE SELECT
NM_001142604.2:c.65G>C
NM_001363695.2:c.65G>C
NP_000301.1:p.Arg22Pro
NP_001136076.1:p.Arg22Pro
NP_001350624.1:p.Arg22Pro
LRG_690:g.5297G>C
NC_000001.10:g.40562846C>G

Protein change:

R22P

Links:

dbSNP: rs1649904164

NCBI 1000 Genomes Browser:

rs1649904164

Molecular consequence:

NM_000310.4:c.65G>C - missense variant - [Sequence Ontology: SO:0001583]
NM_001142604.2:c.65G>C - missense variant - [Sequence Ontology: SO:0001583]
NM_001363695.2:c.65G>C - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Neuronal ceroid lipofuscinosis 1 (CLN1)
Synonyms:: CEROID LIPOFUSCINOSIS, NEURONAL, 1, VARIABLE AGE AT ONSET; CLN1 variable age at onset; Infantile CLN (type of CLN1); See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0009744; MedGen: C1850451; OMIM: 256730

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV001493200	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Nov 27, 2021)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV002086015	Natera, Inc.	no assertion criteria provided	Uncertain significance (Sep 23, 2020)	germline	clinical testing

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV001493200

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Nov 27, 2021)

germline

clinical testing

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

SCV002086015

Natera, Inc.

no assertion criteria provided

Uncertain significance
(Sep 23, 2020)

germline

clinical testing

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, SCV001493200.4

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

Description

This sequence change replaces arginine, which is basic and polar, with proline, which is neutral and non-polar, at codon 22 of the PPT1 protein (p.Arg22Pro). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with PPT1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1006830). 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 PPT1 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

From Natera, Inc., SCV002086015.1

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

#	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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