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UniProtKB/Swiss-Prot Q8N6Q3: Variant p.Ala3Pro

CD177 antigen
Gene: CD177
Variant information

Variant position:  3
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Polymorphism
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants implicated in disease according to literature reports.
  • Polymorphism: Variants not reported to be implicated in disease.
  • Unclassified: Variants with uncertain implication in disease according to literature reports. Evidence against or in favor of a pathogenic role is limited and/or conflicting.

Residue change:  From Alanine (A) to Proline (P) at position 3 (A3P, p.Ala3Pro).
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 small size and hydrophobic (A) to medium size and hydrophobic (P)
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

Polymorphism:  There is a significant association between the variants Ala-3, Leu-251 and Thr-348 and a low expression of CD177 on neutrophils (PubMed:12623849, PubMed:14692971). Expression of CD177 on neutrophils is a trait determined by ratio of CD177/CD177P1 alleles (PubMed:27227454). The phenotype of CD177 null neutrophils is due to recombination between exon 7 of CD177 and the pseudogene CD177P1 through gene conversion, changing Lys-263 codon into stop codon (PubMed:27227454). The lack of CD177 expression affects 1-10 percent of the population placing them at risk for formation of anti-neutrophil antibodies that can cause transfusion-related acute lung injury and neonatal alloimmune neutropenia.
Additional information on the polymorphism described.

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



Sequence information

Variant position:  3
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  437
The length of the canonical sequence.

Location on the sequence:   MS  A VLLLALLGFILPLPGVQALL
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                         MSAVLLLALLGFI------------------------LPL-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------PGV-----------------------------------------------------------------------------------------------------------------QALL

Mouse                         MNSIPVLTLLGVTALLPCVPALT

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
Signal peptide 1 – 21


Literature citations

Molecular basis of the neutrophil glycoprotein NB1 (CD177) involved in the pathogenesis of immunenneutropenia and transfusion reactions.
Kissel K.; Santoso S.; Hofmann C.; Stroncek D.; Bux J.;
Eur. J. Immunol. 31:1301-1309(2001)
Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1); PROTEIN SEQUENCE OF 35-45; 167-175 AND 386-393; VARIANTS PRO-3; PHE-119; ILE-251; GLN-323 AND SER-379; MASS SPECTROMETRY; GLYCOSYLATION;

Molecular basis of NB1 (HNA-2a, CD177) deficiency.
Kissel K.; Scheffler S.; Kerowgan M.; Bux J.;
Blood 99:4231-4233(2002)
Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORMS 2 AND 3); VARIANT PRO-3;

The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).
The MGC Project Team;
Genome Res. 14:2121-2127(2004)
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 1); VARIANTS PRO-3 AND THR-348;

CD177 polymorphisms: correlation between high-frequency single nucleotide polymorphisms and neutrophil surface protein expression.
Caruccio L.; Walkovich K.; Bettinotti M.; Schuller R.; Stroncek D.;
Transfusion 44:77-82(2004)
Cited for: VARIANTS PRO-3; PHE-119; GLN-323 AND SER-379; POLYMORPHISM;

Heterogeneity of human neutrophil CD177 expression results from CD177P1 pseudogene conversion.
Wu Z.; Liang R.; Ohnesorg T.; Cho V.; Lam W.; Abhayaratna W.P.; Gatenby P.A.; Perera C.; Zhang Y.; Whittle B.; Sinclair A.; Goodnow C.C.; Field M.; Andrews T.D.; Cook M.C.;
PLoS Genet. 12:E1006067-E1006067(2016)
Cited for: VARIANTS PRO-3; LEU-31; ILE-251; ALA-261; THR-348 AND ARG-431; SUBCELLULAR LOCATION; TISSUE SPECIFICITY; POLYMORPHISM;

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.