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NM_000249.4(MLH1):c.117-1G>C AND Hereditary cancer-predisposing syndrome

Germline classification:
Likely pathogenic (1 submission)
Last evaluated:
Dec 20, 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:
RCV003172134.2

Allele description [Variation Report for NM_000249.4(MLH1):c.117-1G>C]

NM_000249.4(MLH1):c.117-1G>C

Gene:
MLH1:mutL homolog 1 [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Cytogenetic location:
3p22.2
Genomic location:
Preferred name:
NM_000249.4(MLH1):c.117-1G>C
HGVS:
  • NC_000003.12:g.36996618G>C
  • NG_007109.2:g.8269G>C
  • NG_008418.1:g.1687C>G
  • NM_000249.4:c.117-1G>CMANE SELECT
  • NM_001167617.3:c.-173-1G>C
  • NM_001167618.3:c.-602-6G>C
  • NM_001167619.3:c.-515-1G>C
  • NM_001258271.2:c.117-1G>C
  • NM_001258273.2:c.-517+2955G>C
  • NM_001258274.3:c.-752-1G>C
  • NM_001354615.2:c.-510-1G>C
  • NM_001354616.2:c.-510-6G>C
  • NM_001354617.2:c.-602-6G>C
  • NM_001354618.2:c.-607-1G>C
  • NM_001354619.2:c.-607-1G>C
  • NM_001354620.2:c.-168-6G>C
  • NM_001354621.2:c.-700-1G>C
  • NM_001354622.2:c.-813-1G>C
  • NM_001354623.2:c.-723+2728G>C
  • NM_001354624.2:c.-710-1G>C
  • NM_001354625.2:c.-608-6G>C
  • NM_001354626.2:c.-705-6G>C
  • NM_001354627.2:c.-710-1G>C
  • NM_001354628.2:c.117-1G>C
  • NM_001354629.2:c.117-1G>C
  • NM_001354630.2:c.117-1G>C
  • LRG_216t1:c.117-1G>C
  • LRG_216:g.8269G>C
  • NC_000003.11:g.37038109G>C
  • NM_000249.3:c.117-1G>C
Molecular consequence:
  • NM_001167618.3:c.-602-6G>C - intron variant - [Sequence Ontology: SO:0001627]
  • NM_001258273.2:c.-517+2955G>C - intron variant - [Sequence Ontology: SO:0001627]
  • NM_001354616.2:c.-510-6G>C - intron variant - [Sequence Ontology: SO:0001627]
  • NM_001354617.2:c.-602-6G>C - intron variant - [Sequence Ontology: SO:0001627]
  • NM_001354620.2:c.-168-6G>C - intron variant - [Sequence Ontology: SO:0001627]
  • NM_001354623.2:c.-723+2728G>C - intron variant - [Sequence Ontology: SO:0001627]
  • NM_001354625.2:c.-608-6G>C - intron variant - [Sequence Ontology: SO:0001627]
  • NM_001354626.2:c.-705-6G>C - intron variant - [Sequence Ontology: SO:0001627]
  • NM_000249.4:c.117-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001167617.3:c.-173-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001167619.3:c.-515-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001258271.2:c.117-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001258274.3:c.-752-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001354615.2:c.-510-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001354618.2:c.-607-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001354619.2:c.-607-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001354621.2:c.-700-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001354622.2:c.-813-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001354624.2:c.-710-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001354627.2:c.-710-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001354628.2:c.117-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001354629.2:c.117-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]
  • NM_001354630.2:c.117-1G>C - splice acceptor variant - [Sequence Ontology: SO:0001574]

Condition(s)

Name:
Hereditary cancer-predisposing syndrome
Synonyms:
Neoplastic Syndromes, Hereditary; Tumor predisposition; Cancer predisposition; See all synonyms [MedGen]
Identifiers:
MONDO: MONDO:0015356; MeSH: D009386; MedGen: C0027672

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Assertion and evidence details

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Submission AccessionSubmitterReview Status
(Assertion method)		Clinical Significance
(Last evaluated)		OriginMethodCitations
SCV003858896Ambry Genetics
criteria provided, single submitter

(Ambry Variant Classification Scheme 2023)		Likely pathogenic
(Dec 20, 2022) 		germlineclinical testing

Citation Link

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Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedgermlineunknownnot providednot providednot providednot providednot providedclinical testing

Details of each submission

From Ambry Genetics, SCV003858896.2

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

Description

The c.117-1G>C intronic variant results from a G to C substitution one nucleotide upstream from coding exon 2 of the MLH1 gene. This nucleotide position is highly conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will weaken the native splice acceptor site. RNA studies have demonstrated that this alteration results in abnormal splicing in the set of samples tested (Ambry internal data). Alterations that disrupt the canonical splice site are expected to cause aberrant splicing, resulting in an abnormal protein or a transcript that is subject to nonsense-mediated mRNA decay. As such, this alteration is classified as likely pathogenic.

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

Last Updated: May 1, 2024