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UniProtKB/Swiss-Prot variant pages

UniProtKB/Swiss-Prot O15353: Variant p.Arg320Trp

Forkhead box protein N1
Gene: FOXN1
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Variant information Variant position: help 320 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: help 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: help From Arginine (R) to Tryptophan (W) at position 320 (R320W, p.Arg320Trp). 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: help Change from large size and basic (R) to large size and aromatic (W) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: help -3 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: help In TIDAND and TLIND; severely reduced transcriptional activity as shown by a transcriptional reporter assay. Any additional useful information about the variant.
Other resources: help Links to websites of interest for the variant.


Sequence information Variant position: help 320 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: help 648 The length of the canonical sequence.
Location on the sequence: help FMTEHFPYFKTAPDGWKNSV R HNLSLNKCFEKVENKSGSSS 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: help The multiple alignment of the region surrounding the variant against various orthologous sequences. 
Human                         FMTEHFPYFKTAPDGWKNSVRHNLSLNKCFEKVENKSGSSS

Mouse                         FMTEHFPYFKTAPDGWKNSVRHNLSLNKCFEKVENKSGSSS
Sequence annotation in neighborhood: help 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 – 648 Forkhead box protein N1
DNA binding 271 – 367 Fork-head
Helix 315 – 325



Literature citations
First use of thymus transplantation therapy for FOXN1 deficiency (nude/SCID): a report of 2 cases.
Markert M.L.; Marques J.G.; Neven B.; Devlin B.H.; McCarthy E.A.; Chinn I.K.; Albuquerque A.S.; Silva S.L.; Pignata C.; de Saint Basile G.; Victorino R.M.; Picard C.; Debre M.; Mahlaoui N.; Fischer A.; Sousa A.E.;
Blood 117:688-696(2011)
Cited for: VARIANTS TIDAND 255-ARG--ALA-648 DEL AND TRP-320; Heterozygous FOXN1 variants cause low TRECs and severe T cell lymphopenia, revealing a crucial role of FOXN1 in supporting early thymopoiesis.
Bosticardo M.; Yamazaki Y.; Cowan J.; Giardino G.; Corsino C.; Scalia G.; Prencipe R.; Ruffner M.; Hill D.A.; Sakovich I.; Yemialyanava I.; Tam J.S.; Padem N.; Elder M.E.; Sleasman J.W.; Perez E.; Niebur H.; Seroogy C.M.; Sharapova S.; Gebbia J.; Kleiner G.I.; Peake J.; Abbott J.K.; Gelfand E.W.; Crestani E.; Biggs C.; Butte M.J.; Hartog N.; Hayward A.; Chen K.; Heimall J.; Seeborg F.; Bartnikas L.M.; Cooper M.A.; Pignata C.; Bhandoola A.; Notarangelo L.D.;
Am. J. Hum. Genet. 105:549-561(2019)
Cited for: VARIANTS TLIND LYS-169; 255-ARG--ALA-648 DEL; TRP-320; ASN-321; PRO-325 AND 474-GLN--ALA-648 DEL; INVOLVEMENT IN TLIND; FOXN1 compound heterozygous mutations cause selective thymic hypoplasia in humans.
Du Q.; Huynh L.K.; Coskun F.; Molina E.; King M.A.; Raj P.; Khan S.; Dozmorov I.; Seroogy C.M.; Wysocki C.A.; Padron G.T.; Yates T.R.; Markert M.L.; de la Morena M.T.; van Oers N.S.;
J. Clin. Invest. 129:4724-4738(2019)
Cited for: VARIANT TIDTA 363-TRP--PRO-368 DELINS CYS; INVOLVEMENT IN TIDTA; VARIANTS SER-242 AND SER-430; CHARACTERIZATION OF VARIANT TIDTA 363-TRP--PRO-368 DELINS CYS; CHARACTERIZATION OF VARIANTS SER-242 AND SER-430; CHARACTERIZATION OF VARIANT TIDAND TRP-320;
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.