NM_017841.4(SDHAF2):c.490A>G (p.Lys164Glu) AND Hereditary pheochromocytoma-paraganglioma

Germline classification:: Conflicting interpretations of pathogenicity (2 submissions)
Last evaluated:: Dec 20, 2023
Review status:: criteria provided, conflicting classifications

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:: RCV000232071.11

Allele description [Variation Report for NM_017841.4(SDHAF2):c.490A>G (p.Lys164Glu)]

NM_017841.4(SDHAF2):c.490A>G (p.Lys164Glu)

Gene:

SDHAF2:succinate dehydrogenase complex assembly factor 2 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

11q12.2

Genomic location:

Preferred name:

NM_017841.4(SDHAF2):c.490A>G (p.Lys164Glu)

HGVS:

NC_000011.10:g.61446060A>G
NG_023393.1:g.20936A>G
NM_017841.4:c.490A>GMANE SELECT
NP_060311.1:p.Lys164Glu
NP_060311.1:p.Lys164Glu
LRG_519t1:c.490A>G
LRG_519:g.20936A>G
LRG_519p1:p.Lys164Glu
NC_000011.9:g.61213532A>G
NM_017841.2:c.490A>G

Protein change:

K164E

Links:

dbSNP: rs150187184

NCBI 1000 Genomes Browser:

rs150187184

Molecular consequence:

NM_017841.4:c.490A>G - missense variant - [Sequence Ontology: SO:0001583]

Observations:

Condition(s)

Name:: Hereditary pheochromocytoma-paraganglioma
Synonyms:: Hereditary Paraganglioma-Pheochromocytoma Syndromes; Hereditary Paragangliomas and Pheochromocytomas
Identifiers:: MONDO: MONDO:0017366; MedGen: C1708353

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000290372	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Dec 20, 2023)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV004817272	All of Us Research Program, National Institutes of Health	criteria provided, single submitter (ACMG Guidelines, 2015)	Likely Benign (Dec 14, 2023)	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

SCV000290372

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Dec 20, 2023)

germline

clinical testing

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

SCV004817272

All of Us Research Program, National Institutes of Health

criteria provided, single submitter

(ACMG Guidelines, 2015)

Likely Benign
(Dec 14, 2023)

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	6	not provided	not provided	108544	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 Labcorp Genetics (formerly Invitae), Labcorp, SCV000290372.9

#	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 lysine, which is basic and polar, with glutamic acid, which is acidic and polar, at codon 164 of the SDHAF2 protein (p.Lys164Glu). This variant is present in population databases (rs150187184, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with SDHAF2-related conditions. ClinVar contains an entry for this variant (Variation ID: 241218). 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 glutamic acid amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. RNA analysis performed to evaluate the impact of this missense change on mRNA splicing indicates it does not significantly alter splicing (Invitae). 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 All of Us Research Program, National Institutes of Health, SCV004817272.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	6	not provided	not provided	clinical testing	PubMed (1)

Description

This missense variant replaces lysine with glutamic acid at codon 164 of the SDHAF2 protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with SDHAF2-related disorders in the literature. This variant has been identified in 5/282870 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is 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	108544	not provided	not provided		6	not provided	not provided	not provided

Last Updated: Oct 13, 2024

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