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UniProtKB/Swiss-Prot P40692: Variant p.Lys618Ala

DNA mismatch repair protein Mlh1
Gene: MLH1
Variant information

Variant position:  618
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  US
The variants are classified into three categories: LP/P, LB/B and US.
  • LP/P: likely pathogenic or pathogenic.
  • LB/B: likely benign or benign.
  • US: uncertain significance

Residue change:  From Lysine (K) to Alanine (A) at position 618 (K618A, p.Lys618Ala).
Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.

Physico-chemical properties:  Change from large size and basic (K) to small size and hydrophobic (A)
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  -1
The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:
  • Lowest score: -4 (low probability of substitution).
  • Highest score: 11 (high probability of substitution).
More information can be found on the following page

Variant description:  In HNPCC2; unknown pathological significance; requires 2 nucleotide substitutions; interacts weakly with PMS2; no decrease in mismatch repair activity; no effect on nuclear localization.
Any additional useful information about the variant.

Other resources:  
Links to websites of interest for the variant.



Sequence information

Variant position:  618
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  756
The length of the canonical sequence.

Location on the sequence:   TEEDGPKEGLAEYIVEFLKK  K AEMLADYFSLEIDEEGNLIG
The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.

Residue conservation: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         TEEDGPKEGLAEYIVEFLKKKAEMLADYFSLEIDEEGN--------LIG

Mouse                         TEDDGPKEGLAEYIVEFLKKKAEMLADYFSVEIDEEGN---

Rat                           TEEDGPKEGLAEYIVEFLKKKAKMLADYFSVEIDEEGN---

Slime mold                    MESDGPKDKIADYLTKLLISKKELLNEYFSIEINEDGE---

Baker's yeast                 LNDDASKEK----IISKIWDMSSMLNEYYSIELVNDGLDND

Fission yeast                 DEDKSESEK----FTRLLVSRRDMLKDYFSISVTSGGL---

Sequence annotation in neighborhood:  
The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:
  • Type: the type of sequence feature.
  • Positions: endpoints of the sequence feature.
  • Description: contains additional information about the feature.

TypePositionsDescription
Chain 2 – 756 DNA mismatch repair protein Mlh1
Region 410 – 650 Interaction with EXO1
Helix 604 – 626


Literature citations

A cell-free assay for the functional analysis of variants of the mismatch repair protein MLH1.
Drost M.; Zonneveld J.B.; van Dijk L.; Morreau H.; Tops C.M.; Vasen H.F.; Wijnen J.T.; de Wind N.;
Hum. Mutat. 31:247-253(2010)
Cited for: CHARACTERIZATION OF VARIANTS HNPCC2 CYS-31; LYS-37; HIS-38; LYS-38; PHE-44; ARG-67; PRO-109; PRO-111; MET-117; CYS-265; SER-265; GLN-443; PRO-550; GLY-578; PHE-582; ASP-589; ALA-618; CYS-646; LEU-648; LEU-654 AND PRO-659; CHARACTERIZATION OF VARIANTS GLY-93; VAL-219; SER-403; ASN-406 AND MET-716; FUNCTION;

Verification of the three-step model in assessing the pathogenicity of mismatch repair gene variants.
Kansikas M.; Kariola R.; Nystroem M.;
Hum. Mutat. 32:107-115(2011)
Cited for: CHARACTERIZATION OF VARIANTS HNPCC2 LEU-28; SER-29; 45-THR--ILE-47 DELINS CYS-PHE; GLU-63; ARG-67; GLU-71 DEL; ARG-77; VAL-80; GLU-84; ARG-107; ARG-155; GLY-185; PRO-247; PRO-329; ILE-330 DEL; GLN-443; ALA-460; PRO-550; 578-GLU--GLU-632 DEL; ASP-589; VAL-612 DEL; LYS-616 DEL; ALA-618; THR-618; 633-GLU--GLU-663 DEL; CYS-646; LEU-648; SER-648; LEU-654; GLN-659; PRO-659; THR-681 AND TRP-687; CHARACTERIZATION OF VARIANTS GLY-93; MET-213; VAL-219 AND MET-716; SUBCELLULAR LOCATION; FUNCTION;

Hereditary nonpolyposis colorectal cancer families not complying with the Amsterdam criteria show extremely low frequency of mismatch-repair-gene mutations.
Wijnen J.; Khan P.M.; Vasen H.; van der Klift H.; Mulder A.; van Leeuwen-Cornelisse I.; Bakker B.; Losekoot M.; Moeller P.; Fodde R.;
Am. J. Hum. Genet. 61:329-335(1997)
Cited for: VARIANTS HNPCC2 LYS-62; SER-64; LYS-616 DEL; ALA-618 AND PRO-659; CHARACTERIZATION OF VARIANT HNPCC2 LYS-62; FUNCTION;

Missense mutations in hMLH1 associated with colorectal cancer.
Liu T.; Tannergaerd P.; Hackman P.; Rubio C.; Kressner U.; Lindmark G.; Hellgren D.; Lambert B.; Lindblom A.;
Hum. Genet. 105:437-441(1999)
Cited for: VARIANT CRC GLY-578; VARIANT HNPCC2 ALA-618;

Detection of mutations in mismatch repair genes in Portuguese families with hereditary non-polyposis colorectal cancer (HNPCC) by a multi-method approach.
Fidalgo P.; Almeida M.R.; West S.; Gaspar C.; Maia L.; Wijnen J.; Albuquerque C.; Curtis A.; Cravo M.; Fodde R.; Leitao C.N.; Burn J.;
Eur. J. Hum. Genet. 8:49-53(2000)
Cited for: VARIANTS HNPCC2 HIS-607; ALA-618 AND LEU-659; VARIANT MET-213;

Sixteen rare sequence variants of the hMLH1 and hMSH2 genes found in a cohort of 254 suspected HNPCC (hereditary non-polyposis colorectal cancer) patients: mutations or polymorphisms?
Mueller-Koch Y.; Kopp R.; Lohse P.; Baretton G.; Stoetzer A.; Aust D.; Daum J.; Kerker B.; Gross M.; Dietmeier W.; Holinski-Feder E.;
Eur. J. Med. Res. 6:473-482(2001)
Cited for: VARIANTS HNPCC2 VAL-80; PRO-329; ARG-603; ALA-618; LEU-648 AND PRO-662; VARIANT HNPCC ARG-689;

Genomic deletions of MSH2 and MLH1 in colorectal cancer families detected by a novel mutation detection approach.
Gille J.J.P.; Hogervorst F.B.L.; Pals G.; Wijnen J.T.; van Schooten R.J.; Dommering C.J.; Meijer G.A.; Craanen M.E.; Nederlof P.M.; de Jong D.; McElgunn C.J.; Schouten J.P.; Menko F.H.;
Br. J. Cancer 87:892-897(2002)
Cited for: VARIANTS HNPCC2 ASN-35; HIS-38; MET-117 AND ALA-618;

Impact of microsatellite testing and mismatch repair protein expression on the clinical interpretation of genetic testing in hereditary non-polyposis colorectal cancer.
Ward R.; Meldrum C.; Williams R.; Mokany E.; Scott R.; Turner J.; Hawkins N.; Burgess B.; Groombridge C.; Spigelman A.;
J. Cancer Res. Clin. Oncol. 128:403-411(2002)
Cited for: VARIANTS HNPCC2 MET-117 AND PRO-247; VARIANTS VAL-219; ALA-618 AND MET-716;

Mutations of hMLH1 and hMSH2 in patients with suspected hereditary nonpolyposis colorectal cancer: correlation with microsatellite instability and abnormalities of mismatch repair protein expression.
Scartozzi M.; Bianchi F.; Rosati S.; Galizia E.; Antolini A.; Loretelli C.; Piga A.; Bearzi I.; Cellerino R.; Porfiri E.;
J. Clin. Oncol. 20:1203-1208(2002)
Cited for: VARIANT HNPCC2 CYS-646; VARIANT ALA-618;

Functional significance and clinical phenotype of nontruncating mismatch repair variants of MLH1.
Raevaara T.E.; Korhonen M.K.; Lohi H.; Hampel H.; Lynch E.; Loennqvist K.E.; Holinski-Feder E.; Sutter C.; McKinnon W.; Duraisamy S.; Gerdes A.-M.; Peltomaeki P.; Kohonen-Corish M.; Mangold E.; Macrae F.; Greenblatt M.; de la Chapelle A.; Nystroem M.;
Gastroenterology 129:537-549(2005)
Cited for: VARIANTS HNPCC2 LEU-28; 45-THR--PHE-47 DELINS CYS-PHE; GLU-63; ARG-67; GLU-71 DEL; ARG-77; VAL-80; GLU-84; ARG-107; ARG-155; GLY-185; PRO-247; PRO-329; ILE-330 DEL; PRO-550; ASP-589; VAL-612 DEL; LYS-616 DEL; LEU-648; SER-648; LEU-654 AND PRO-659; VARIANTS SER-29; GLY-93; GLN-443; ALA-618; CYS-646; GLN-659; THR-681 AND MET-716; CHARACTERIZATION OF VARIANTS HNPCC2 LEU-28; 45-THR--PHE-47 DELINS CYS-PHE; GLU-63; ARG-67; GLU-71 DEL; ARG-77; VAL-80; GLU-84; ARG-107; ARG-155; GLY-185; PRO-247; PRO-329; ILE-330 DEL; PRO-550; ASP-589; VAL-612 DEL; LYS-616 DEL; THR-618; LEU-648; SER-648; LEU-654 AND PRO-659; CHARACTERIZATION OF VARIANTS SER-29; GLY-93; MET-213; VAL-219; GLN-443; ALA-618; CYS-646; GLN-659; THR-681 AND MET-716;

Classification of ambiguous mutations in DNA mismatch repair genes identified in a population-based study of colorectal cancer.
Barnetson R.A.; Cartwright N.; van Vliet A.; Haq N.; Drew K.; Farrington S.; Williams N.; Warner J.; Campbell H.; Porteous M.E.; Dunlop M.G.;
Hum. Mutat. 29:367-374(2008)
Cited for: VARIANTS CRC GLU-67 AND THR-681; VARIANTS ALA-22; GLY-93; SER-309; ASN-406; HIS-607; ALA-618; ARG-689; MET-716; TYR-718 AND ARG-751;

Functional characterization of MLH1 missense variants identified in Lynch syndrome patients.
Andersen S.D.; Liberti S.E.; Luetzen A.; Drost M.; Bernstein I.; Nilbert M.; Dominguez M.; Nystroem M.; Hansen T.V.; Christoffersen J.W.; Jaeger A.C.; de Wind N.; Nielsen F.C.; Toerring P.M.; Rasmussen L.J.;
Hum. Mutat. 33:1647-1655(2012)
Cited for: VARIANTS HNPCC2 CYS-233 DEL AND TRP-389; CHARACTERIZATION OF VARIANTS HNPCC2 LEU-28; LYS-37; HIS-38; LYS-38; PHE-44; ARG-67; PRO-109; PRO-111; MET-117; CYS-233 DEL; CYS-265; TRP-389; GLN-443; PRO-550; GLY-578; PHE-582; ASP-589; ALA-618; CYS-646; LEU-648; LEU-654; PRO-659 AND VAL-716 DEL; CHARACTERIZATION OF VARIANTS GLY-93; VAL-219; SER-403; ASN-406 AND MET-716; INTERACTION WITH PMS2; INTERACTION WITH EXO1; SUBCELLULAR LOCATION;

Disclaimer: Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. They are not in any way intended to be used as a substitute for professional medical advice, diagnostic, treatment or care.