NM_199161.5:c.346G>C

Variant names:

• chr11-18269832-G-C
• rs1416698471
• NM_199161.5:c.346G>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_199161.5(SAA1):​c.346G>C​(p.Ala116Pro) variant causes a missense 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. 15/20 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A116S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: SAA1 NM_199161.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.911
• 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]

ENSG00000303304 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06630227).

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.346G>C	p.Ala116Pro	missense	Exon 4 of 4	NP_954630.2	P0DJI8
	SAA1	NM_000331.6		c.346G>C	p.Ala116Pro	missense	Exon 4 of 4	NP_000322.3
	SAA1	NM_001178006.3		c.346G>C	p.Ala116Pro	missense	Exon 5 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.346G>C	p.Ala116Pro	missense	Exon 4 of 4	ENSP00000348918.4	P0DJI8
	SAA1	ENST00000532858.5	TSL:1	c.346G>C	p.Ala116Pro	missense	Exon 5 of 5	ENSP00000436866.1	P0DJI8
	SAA1	ENST00000405158.2	TSL:5	c.346G>C	p.Ala116Pro	missense	Exon 4 of 4	ENSP00000384906.2	P0DJI8

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251432 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 6.84e-7 AC: 1 AN: 1461852 Hom.: 0 Cov.: 35 AF XY: 0.00 AC XY: 0 AN XY: 727230

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.0000224 AC: 1 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86252

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5754

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1112000

Other (OTH) AF: 0.00 AC: 0 AN: 60392

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.088
BayesDel_addAF	Benign	-0.24	T
BayesDel_noAF	Benign	-0.58
CADD	Benign	2.3
DANN	Benign	0.78
DEOGEN2	Benign	0.010	T
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.043	N
LIST_S2	Benign	0.52	T
M_CAP	Benign	0.0037	T
MetaRNN	Benign	0.066	T
MetaSVM	Benign	-1.0	T
PhyloP100		-0.91
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-0.65	N
REVEL	Benign	0.051
Sift	Benign	0.34	T
Sift4G	Benign	0.30	T
Vest4		0.18
MutPred		0.36		Gain of catalytic residue at P115 (P = 0.0164)
MVP		0.030
MPC		0.0077
ClinPred		0.37	T
GERP RS		-4.1
gMVP		0.22
Mutation Taster		=92/8	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs1416698471; hg19: chr11-18291379;