11-18269325-A-G

Variant names:

• chr11-18269325-A-G
• rs776035778
• NM_199161.5:c.222A>G

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_199161.5(SAA1):​c.222A>G​(p.Glu74Glu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 30)
• Consequence: SAA1 NM_199161.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.82
• Publications: 0 publications found

Genes affected

SAA1 (HGNC:10513): (serum amyloid A1) This gene encodes a member of the serum amyloid A family of apolipoproteins. The encoded preproprotein is proteolytically processed to generate the mature protein. This protein is a major acute phase protein that is highly expressed in response to inflammation and tissue injury. This protein also plays an important role in HDL metabolism and cholesterol homeostasis. High levels of this protein are associated with chronic inflammatory diseases including atherosclerosis, rheumatoid arthritis, Alzheimer's disease and Crohn's disease. This protein may also be a potential biomarker for certain tumors. Finally, antimicrobial activity against S. aureus and E. coli resides in the N-terminal portion of the mature protein. Alternate splicing results in multiple transcript variants that encode the same protein. A pseudogene of this gene is found on chromosome 11. [provided by RefSeq, Jul 2020]

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_199161.5. 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
	SAA1	NM_199161.5	MANE Select	c.222A>G	p.Glu74Glu	synonymous	Exon 3 of 4	NP_954630.2	P0DJI8
	SAA1	NM_000331.6		c.222A>G	p.Glu74Glu	synonymous	Exon 3 of 4	NP_000322.3
	SAA1	NM_001178006.3		c.222A>G	p.Glu74Glu	synonymous	Exon 4 of 5	NP_001171477.2	P0DJI8

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SAA1	ENST00000356524.9	TSL:1 MANE Select	c.222A>G	p.Glu74Glu	synonymous	Exon 3 of 4	ENSP00000348918.4	P0DJI8
	SAA1	ENST00000532858.5	TSL:1	c.222A>G	p.Glu74Glu	synonymous	Exon 4 of 5	ENSP00000436866.1	P0DJI8
	SAA1	ENST00000405158.2	TSL:5	c.222A>G	p.Glu74Glu	synonymous	Exon 3 of 4	ENSP00000384906.2	P0DJI8

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome Cov.: 39

GnomAD4 genome Cov.: 30

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.85
CADD	Benign	19
DANN	Benign	0.59
PhyloP100		1.8

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.79		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.79		Position offset: 0
DS_DL_spliceai		0.27		Position offset: 8

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

Other links and lift over

dbSNP: rs776035778; hg19: chr11-18290872;