NM_032581.4(HYCC1):c.1480G>A (p.Val494Ile) AND Hypomyelination and Congenital Cataract

Germline classification:: Uncertain significance (3 submissions)
Last evaluated:: Jan 17, 2024
Review status:: 2 stars out of maximum of 4 stars
criteria provided, multiple submitters, no conflicts

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:: RCV000306247.10

Allele description [Variation Report for NM_032581.4(HYCC1):c.1480G>A (p.Val494Ile)]

NM_032581.4(HYCC1):c.1480G>A (p.Val494Ile)

Gene:

HYCC1:hyccin PI4KA lipid kinase complex subunit 1 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

7p15.3

Genomic location:

Preferred name:

NM_032581.4(HYCC1):c.1480G>A (p.Val494Ile)

HGVS:

NC_000007.14:g.22945675C>T
NG_008392.1:g.73477G>A
NM_001363466.2:c.*516G>A
NM_001363467.2:c.*474G>A
NM_032581.4:c.1480G>AMANE SELECT
NP_115970.2:p.Val494Ile
NC_000007.13:g.22985294C>T
NM_032581.3:c.1480G>A
p.Val494Ile

Protein change:

V494I

Links:

dbSNP: rs151228394

NCBI 1000 Genomes Browser:

rs151228394

Molecular consequence:

NM_001363466.2:c.*516G>A - 3 prime UTR variant - [Sequence Ontology: SO:0001624]
NM_001363467.2:c.*474G>A - 3 prime UTR variant - [Sequence Ontology: SO:0001624]
NM_032581.4:c.1480G>A - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Hypomyelination and Congenital Cataract (HLD5)
Synonyms:: LEUKODYSTROPHY, HYPOMYELINATING, 5
Identifiers:: MONDO: MONDO:0012514; MedGen: C1864663; Orphanet: 85163; OMIM: 610532

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000468319	Illumina Laboratory Services, Illumina	criteria provided, single submitter (ICSL Variant Classification Criteria 13 December 2019)	Uncertain significance (Jan 12, 2018)	germline	clinical testing	Citation Link,
SCV003501740	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Jan 17, 2024)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV003832343	Revvity Omics, Revvity	criteria provided, single submitter (ACMG Guidelines, 2015)	Uncertain significance (Dec 5, 2019)	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

SCV000468319

Illumina Laboratory Services, Illumina

criteria provided, single submitter

(ICSL Variant Classification Criteria 13 December 2019)

Uncertain significance
(Jan 12, 2018)

germline

clinical testing

Citation Link,

SCV003501740

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Jan 17, 2024)

germline

clinical testing

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

SCV003832343

Revvity Omics, Revvity

criteria provided, single submitter

(ACMG Guidelines, 2015)

Uncertain significance
(Dec 5, 2019)

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

Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology.

Richards S, Aziz N, Bale S, Bick D, Das S, Gastier-Foster J, Grody WW, Hegde M, Lyon E, Spector E, Voelkerding K, Rehm HL; ACMG Laboratory Quality Assurance Committee.

Genet Med. 2015 May;17(5):405-24. doi: 10.1038/gim.2015.30. Epub 2015 Mar 5.

PubMed [citation]

PMID:: 25741868
PMCID:: PMC4544753

Details of each submission

From Illumina Laboratory Services, Illumina, SCV000468319.3

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

Description

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.

#	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 Labcorp Genetics (formerly Invitae), Labcorp, SCV003501740.2

#	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 valine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 494 of the FAM126A protein (p.Val494Ile). This variant is present in population databases (rs151228394, gnomAD 0.08%). This variant has not been reported in the literature in individuals affected with FAM126A-related conditions. ClinVar contains an entry for this variant (Variation ID: 359770). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The isoleucine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect 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 Revvity Omics, Revvity, SCV003832343.2

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

#	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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