NM_002755.4(MAP2K1):c.848C>T (p.Ala283Val) AND not specified

Clinical significance:Likely benign (Last evaluated: Mar 23, 2020)

Review status:2 stars out of maximum of 4 stars

criteria provided, multiple submitters, no conflicts

Based on:
3 submissions [Details]
Record status:
current
Accession:
RCV000037602.4

Allele description [Variation Report for NM_002755.4(MAP2K1):c.848C>T (p.Ala283Val)]

NM_002755.4(MAP2K1):c.848C>T (p.Ala283Val)

Gene:
MAP2K1:mitogen-activated protein kinase kinase 1 [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Cytogenetic location:
15q22.31
Genomic location:
Preferred name:
NM_002755.4(MAP2K1):c.848C>T (p.Ala283Val)
Other names:
p.A283V:GCG>GTG; NM_002755.3(MAP2K1):c.848C>T
HGVS:
  • NC_000015.10:g.66485144C>T
  • NG_008305.1:g.103272C>T
  • NM_002755.3:c.848C>T
  • NM_002755.4:c.848C>TMANE SELECT
  • NP_002746.1:p.Ala283Val
  • NP_002746.1:p.Ala283Val
  • LRG_725t1:c.848C>T
  • LRG_725:g.103272C>T
  • LRG_725p1:p.Ala283Val
  • NC_000015.9:g.66777482C>T
  • c.848C>T
Protein change:
A283V
Links:
dbSNP: rs144080051
NCBI 1000 Genomes Browser:
rs144080051
Molecular consequence:
  • NM_002755.3:c.848C>T - missense variant - [Sequence Ontology: SO:0001583]
  • NM_002755.4:c.848C>T - missense variant - [Sequence Ontology: SO:0001583]
Observations:
1

Condition(s)

Synonyms:
AllHighlyPenetrant
Identifiers:
MedGen: CN169374

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Assertion and evidence details

Submission AccessionSubmitterReview Status
(Assertion method)
Clinical Significance
(Last evaluated)
OriginMethodCitations
SCV000061262Laboratory for Molecular Medicine, Partners HealthCare Personalized Medicinecriteria provided, single submitter
Likely benign
(Jan 28, 2014)
germlineclinical testing

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

SCV000207935GeneDxcriteria provided, single submitter
Likely benign
(Jul 28, 2015)
germlineclinical testing

Citation Link,

SCV001338958Women's Health and Genetics/Laboratory Corporation of America, LabCorpcriteria provided, single submitter
Likely benign
(Mar 23, 2020)
germlineclinical testing

Citation Link

Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedgermlineunknownnot providednot providednot providednot providednot providedclinical testing
not providedgermlineyesnot providednot providednot providednot providednot providedclinical testing
not providedgermlinenot provided31not providednot providednot providedclinical testing

Citations

PubMed

A systematic approach to assessing the clinical significance of genetic variants.

Duzkale H, Shen J, McLaughlin H, Alfares A, Kelly MA, Pugh TJ, Funke BH, Rehm HL, Lebo MS.

Clin Genet. 2013 Nov;84(5):453-63. doi: 10.1111/cge.12257.

PubMed [citation]
PMID:
24033266
PMCID:
PMC3995020

Details of each submission

From Laboratory for Molecular Medicine, Partners HealthCare Personalized Medicine, SCV000061262.5

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not provided3not providednot providedclinical testing PubMed (1)

Description

Ala283Val in exon 7 of MAP2K1: This variant is not expected to have clinical sig nificance due to a lack of conservation across species, including mammals. Of no te, Egyptian jerboa and dog have a valine (Val) at this position despite high ne arby amino acid conservation. In addition, computational analyses (PolyPhen2, SI FT, AlignGVGD) do not suggest a high likelihood of impact to the protein. This v ariant has been identified in 0.1% (5/4402) of African American chromosomes by t he NHLBI Exome Sequencing Project (http://evs.gs.washington.edu/EVS/; dbSNP rs14 4080051).

#SampleMethodObservation
OriginAffectedNumber testedTissuePurposeMethodIndividualsAllele frequencyFamiliesCo-occurrences
1germlinenot providednot providednot providednot provided3not provided1not provided

From GeneDx, SCV000207935.12

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical testingnot provided

Description

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease.

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

From Women's Health and Genetics/Laboratory Corporation of America, LabCorp, SCV001338958.1

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical testingnot provided

Description

Variant summary: MAP2K1 c.848C>T (p.Ala283Val) results in a non-conservative amino acid change located in the Protein kinase domain of the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 5.2e-05 in 251410 control chromosomes, predominantly at a frequency of 0.0008 within the African or African-American subpopulation in the gnomAD database. The observed variant frequency within African or African-American control individuals in the gnomAD database is significantly above the estimated maximal expected allele frequency for a pathogenic variant in MAP2K1 causing Noonan Syndrome and Related Conditions phenotype (2.5e-06), strongly suggesting that the variant is a benign polymorphism found primarily in populations of African or African-American origin. To our knowledge, no occurrence of c.848C>T in individuals affected with Noonan Syndrome and Related Conditions and no experimental evidence demonstrating its impact on protein function have been reported. Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as benign/likely benign. Based on the evidence outlined above, the variant was classified as likely benign.

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

Last Updated: Aug 27, 2021

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