2-86790560-GAG-CAA

Variant names:

• chr2-86790560-GAG-CAA
• NM_001768.7:c.169_171delCTCinsTTG
• CD8A p.58

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP7

The NM_001768.7(CD8A):​c.169_171delCTCinsTTG​(p.58) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type MNV, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. L57L) has been classified as Benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: CD8A NM_001768.7 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.24
• Publications: 0 publications found

Genes affected

CD8A (HGNC:1706): (CD8 subunit alpha) The CD8 antigen is a cell surface glycoprotein found on most cytotoxic T lymphocytes that mediates efficient cell-cell interactions within the immune system. The CD8 antigen acts as a coreceptor with the T-cell receptor on the T lymphocyte to recognize antigens displayed by an antigen presenting cell in the context of class I MHC molecules. The coreceptor functions as either a homodimer composed of two alpha chains or as a heterodimer composed of one alpha and one beta chain. Both alpha and beta chains share significant homology to immunoglobulin variable light chains. This gene encodes the CD8 alpha chain. Multiple transcript variants encoding different isoforms have been found for this gene. The major protein isoforms of this gene differ by the presence or absence of a transmembrane domain and thus differ in being a membrane-anchored or secreted protein. [provided by RefSeq, May 2020]

CD8A Gene-Disease associations (from GenCC):

• susceptibility to respiratory infections associated with CD8alpha chain mutation

  Inheritance: AR Classification: STRONG, SUPPORTIVE, LIMITED Submitted by: ClinGen, Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• BP7: Synonymous conserved (PhyloP=2.24 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001768.7. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CD8A	NM_001768.7	MANE Select	c.169_171delCTCinsTTG	p.58	synonymous	N/A	NP_001759.3
	CD8A	NM_001145873.1		c.169_171delCTCinsTTG	p.58	synonymous	N/A	NP_001139345.1	Q6ZVS2
	CD8A	NM_001382698.1		c.169_171delCTCinsTTG	p.58	synonymous	N/A	NP_001369627.1	P01732-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CD8A	ENST00000283635.8	TSL:1 MANE Select	c.169_171delCTCinsTTG	p.58	synonymous	N/A	ENSP00000283635.3	P01732-1
	CD8A	ENST00000409511.6	TSL:2	c.169_171delCTCinsTTG	p.58	synonymous	N/A	ENSP00000386559.2	P01732-1
	CD8A	ENST00000352580.7	TSL:2	c.169_171delCTCinsTTG	p.58	synonymous	N/A	ENSP00000321631.3	P01732-2

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.2

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr2-87017683;