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UniProtKB/Swiss-Prot P00740: Variant p.Asn138His

Coagulation factor IX
Gene: F9
Variant information

Variant position:  138
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 Asparagine (N) to Histidine (H) at position 138 (N138H, p.Asn138His).
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:  Similar physico-chemical property. Both residues are medium size and polar.
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 HEMB; unknown pathological significance; decreased protein abundance; decreased function in blood coagulation.
Any additional useful information about the variant.



Sequence information

Variant position:  138
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  461
The length of the canonical sequence.

Location on the sequence:   WCPFGFEGKNCELDVTCNIK  N GRCEQFCKNSADNKVVCSCT
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                         WCPFGFEGKNCELDVTCNIKNGRCEQFCKNSADNKVVCSCT

                              WCRAGFEGKNCELDVTCNIKNGRCKQFCKLGPDNKVVCSCT

Chimpanzee                    WCPFGFEGKNCELDVTCNIKNGRCEQFCKNSADNKVVCSCT

Mouse                         WCQVGFEGRNCELDATCNIKNGRCKQFCKNSPDNKVICSCT

Rat                           WCQAGFEGRNCELDATCSIKNGRCKQFCKNSPDNKIICSCT

Bovine                        WCQAGFEGTNCELDATCSIKNGRCKQFCKRDTDNKVVCSCT

Cat                           WCQTGFEGKNCELDVTCNIKNGRCKQFCKLDADNKVVCSCT

Chicken                       MCPPGYGGRNCEIDSTCATKNGGCEHFCRHDTPQKAVCSCA

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 47 – 461 Coagulation factor IX
Chain 47 – 191 Coagulation factor IXa light chain
Domain 130 – 171 EGF-like 2
Disulfide bond 134 – 145
Helix 137 – 140


Literature citations

Comprehensive analysis of phenotypes and genetics in 21 Chinese families with haemophilia B: characterization of five novel mutations.
Guo Z.P.; Yang L.H.; Qin X.Y.; Liu X.E.; Chen J.F.; Zhang Y.F.;
Haemophilia 20:859-865(2014)
Cited for: VARIANTS HEMB SER-20; TYR-28; SER-46; ASP-54; GLU-58; ARG-84; HIS-138; GLN-226; ILE-284 DEL; MET-296; LYS-328; TYR-328; THR-414 AND TYR-THR-LYS-VAL-447 INS; CHARACTERIZATION OF VARIANTS HEMB SER-20; TYR-28; SER-46; ASP-54; GLU-58; ARG-84; HIS-138; GLN-226; ILE-284 DEL; MET-296; LYS-328; TYR-328; THR-414 AND TYR-THR-LYS-VAL-447 INS;

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.