chr12-8822712-C-A

Variant names:

• chr12-8822712-C-A
• rs749520022
• NM_144670.6:c.61C>A

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_144670.6(A2ML1):​c.61C>A​(p.Pro21Thr) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,782 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P21A) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: A2ML1 NM_144670.6 missense, splice_region
• Scores: Splicing: ADA: 0.9690
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 2.87
• Publications: 0 publications found

Genes affected

A2ML1 (HGNC:23336): (alpha-2-macroglobulin like 1) This gene encodes a member of the alpha-macroglobulin superfamily. The encoded protein is thought to be an N-glycosylated monomeric protein that acts as an inhibitor of several proteases. It has been shown to form covalent interactions with proteases, and has been reported as the p170 antigen recognized by autoantibodies in the autoimmune disease paraneoplastic pemphigus (PNP; PMID:20805888). Mutations in these gene have also been associated with some cases of Noonan syndrome (NS; PMID:24939586) as well as some cases of otitis media (PMID:26121085). Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Aug 2015]

A2ML1-AS1 (HGNC:41022): (A2ML1 antisense RNA 1)

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.30719686).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_144670.6. 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
	A2ML1	NM_144670.6	MANE Select	c.61C>A	p.Pro21Thr	missense splice_region	Exon 1 of 36	NP_653271.3	A8K2U0-1
	A2ML1-AS1	NR_046715.1		n.645+7950G>T		intron	N/A

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	A2ML1	ENST00000299698.12	TSL:1 MANE Select	c.61C>A	p.Pro21Thr	missense splice_region	Exon 1 of 36	ENSP00000299698.7	A8K2U0-1
	A2ML1-AS1	ENST00000537288.1	TSL:3	n.286+7950G>T		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461782 Hom.: 0 Cov.: 30 AF XY: 0.00000413 AC XY: 3 AN XY: 727198

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

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

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

South Asian (SAS) AF: 0.00 AC: 0 AN: 86242

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

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1111922

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

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	not provided (1)
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.39
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.045	T
Eigen	Uncertain	0.23
Eigen_PC	Uncertain	0.28
FATHMM_MKL	Uncertain	0.83	D
LIST_S2	Benign	0.44	T
M_CAP	Benign	0.0037	T
MetaRNN	Benign	0.31	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.4	L
PhyloP100		2.9
PrimateAI	Benign	0.43	T
PROVEAN	Uncertain	-4.2	D
REVEL	Benign	0.17
Sift	Uncertain	0.0080	D
Sift4G	Benign	0.10	T
Polyphen		0.93	P
Vest4		0.22
MutPred		0.66		Gain of catalytic residue at P21 (P = 0.0513)
MVP		0.19
MPC		0.32
ClinPred		0.95	D
GERP RS		4.3
PromoterAI		-0.13	Neutral
Varity_R		0.21
gMVP		0.68
Mutation Taster		=87/13	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	0.97
dbscSNV1_RF	Benign	0.69
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: rs749520022; hg19: chr12-8975308;