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UniProtKB/Swiss-Prot Q9NYP3: Variant p.Met446Thr

Protein downstream neighbor of Son
Gene: DONSON
Variant information

Variant position:  446
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  LP/P [Disclaimer]
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 Methionine (M) to Threonine (T) at position 446 (M446T, p.Met446Thr).
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 medium size and hydrophobic (M) to medium size and polar (T)
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 MISSLA; reduced protein level; reduced nuclear localization.
Any additional useful information about the variant.

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



Sequence information

Variant position:  446
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  566
The length of the canonical sequence.

Location on the sequence:   GPQAGLPPTLLSPVAFRGAT  M QMLKARSVNVKTQALSGYRD
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                         GPQAGLPPTLLSPVAFRGATMQMLKARSVNVKTQALSGYRD

Mouse                         GAQAGLPPTLLSPIAFRGASMQMLKARSSNVKTQALSGYRD

Xenopus laevis                GLQAGLPPTLLSPVAFRGATMHALKARSVNVKTRVNSGYKD

Xenopus tropicalis            GPQAGLPPTLLSPVAFRGATMQTLKARSVNVKTQVRSGYKD

Drosophila                    GRLAGVPPTLLSPVAFPKATMQHLVPRSKKVRLDGV----D

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 1 – 566 Protein downstream neighbor of Son
Alternative sequence 264 – 566 Missing. In isoform 2.
Alternative sequence 266 – 566 Missing. In isoform 3.


Literature citations

Mutations in DONSON disrupt replication fork stability and cause microcephalic dwarfism.
Reynolds J.J.; Bicknell L.S.; Carroll P.; Higgs M.R.; Shaheen R.; Murray J.E.; Papadopoulos D.K.; Leitch A.; Murina O.; Tarnauskaite Z.; Wessel S.R.; Zlatanou A.; Vernet A.; von Kriegsheim A.; Mottram R.M.; Logan C.V.; Bye H.; Li Y.; Brean A.; Maddirevula S.; Challis R.C.; Skouloudaki K.; Almoisheer A.; Alsaif H.S.; Amar A.; Prescott N.J.; Bober M.B.; Duker A.; Faqeih E.; Seidahmed M.Z.; Al Tala S.; Alswaid A.; Ahmed S.; Al-Aama J.Y.; Altmueller J.; Al Balwi M.; Brady A.F.; Chessa L.; Cox H.; Fischetto R.; Heller R.; Henderson B.D.; Hobson E.; Nuernberg P.; Percin E.F.; Peron A.; Spaccini L.; Quigley A.J.; Thakur S.; Wise C.A.; Yoon G.; Alnemer M.; Tomancak P.; Yigit G.; Taylor A.M.; Reijns M.A.; Simpson M.A.; Cortez D.; Alkuraya F.S.; Mathew C.G.; Jackson A.P.; Stewart G.S.;
Nat. Genet. 49:537-549(2017)
Cited for: INVOLVEMENT IN MISSLA; VARIANTS MISSLA ARG-278; CYS-282; LEU-292; 293-ARG--SER-566 DEL; 417-ASN-SER-418 DEL; 419-LYS--SER-566 DEL; 428-GLN--SER-566 DEL; SER-433; THR-446; THR-489; LYS-504; LYS-543 INS AND 563-ASN--SER-566 DEL; CHARACTERIZATION OF VARIANTS MISSLA CYS-282; LEU-292; 417-ASN-SER-418 DEL; THR-446; THR-489 AND LYS-543; VARIANT ARG-28; CHARACTERIZATION OF VARIANT ARG-28; FUNCTION; SUBCELLULAR LOCATION; INDUCTION; IDENTIFICATION IN THE REPLISOME COMPLEX; INTERACTION WITH MCM2; MCM7; PCNA AND TICRR;

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.