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NM_000687.4(AHCY):c.662A>G (p.Tyr221Cys) AND Hypermethioninemia with deficiency of S-adenosylhomocysteine hydrolase

Germline classification:
Uncertain significance (1 submission)
Last evaluated:
Jul 6, 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:
RCV003106615.5

Allele description [Variation Report for NM_000687.4(AHCY):c.662A>G (p.Tyr221Cys)]

NM_000687.4(AHCY):c.662A>G (p.Tyr221Cys)

Gene:
AHCY:adenosylhomocysteinase [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Cytogenetic location:
20q11.22
Genomic location:
Preferred name:
NM_000687.4(AHCY):c.662A>G (p.Tyr221Cys)
HGVS:
  • NC_000020.11:g.34290835T>C
  • NG_012630.3:g.26001A>G
  • NM_000687.4:c.662A>GMANE SELECT
  • NM_001161766.2:c.578A>G
  • NM_001322084.2:c.578A>G
  • NM_001322085.2:c.578A>G
  • NM_001322086.2:c.668A>G
  • NM_001362750.2:c.662A>G
  • NP_000678.1:p.Tyr221Cys
  • NP_001155238.1:p.Tyr193Cys
  • NP_001309013.1:p.Tyr193Cys
  • NP_001309014.1:p.Tyr193Cys
  • NP_001309015.1:p.Tyr223Cys
  • NP_001349679.1:p.Tyr221Cys
  • NC_000020.10:g.32878641T>C
  • NG_012630.2:g.25968A>G
Protein change:
Y193C
Molecular consequence:
  • NM_000687.4:c.662A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001161766.2:c.578A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001322084.2:c.578A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001322085.2:c.578A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001322086.2:c.668A>G - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001362750.2:c.662A>G - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:
Hypermethioninemia with deficiency of S-adenosylhomocysteine hydrolase
Synonyms:
Hypermethioninemia with s-adenosylhomocysteine hydrolase deficiency
Identifiers:
MONDO: MONDO:0013404; MedGen: C3151058; Orphanet: 88618; OMIM: 613752

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Assertion and evidence details

Help
Submission AccessionSubmitterReview Status
(Assertion method)		Clinical Significance
(Last evaluated)		OriginMethodCitations
SCV003779858Labcorp Genetics (formerly Invitae), Labcorp
criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))		Uncertain significance
(Jul 6, 2022) 		germlineclinical testing

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

Help

Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedgermlineunknownnot providednot providednot providednot providednot providedclinical 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, SCV003779858.3

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical 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 are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Not Available"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Not Available"). This variant has not been reported in the literature in individuals affected with AHCY-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces tyrosine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 221 of the AHCY protein (p.Tyr221Cys).

#SampleMethodObservation
OriginAffectedNumber testedTissuePurposeMethodIndividualsAllele frequencyFamiliesCo-occurrences
1germlineunknownnot providednot providednot providednot providednot providednot providednot provided

Last Updated: Sep 29, 2024