12-8852296-C-G

Variant names:

• chr12-8852296-C-G
• rs1860926
• NM_144670.6:c.2550C>G

Variant summary

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

The NM_144670.6(A2ML1):​c.2550C>G​(p.Asp850Glu) 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. 16/22 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 nucleotide change resulting in the same amino acid substitution has been previously reported as Benign in ClinVar.

• Frequency: Genomes: not found (cov: 31)
• Consequence: A2ML1 NM_144670.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.103
• Publications: 31 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 Gene-Disease associations (from GenCC):

• Noonan syndrome

  Inheritance: AD Classification: SUPPORTIVE, LIMITED, NO_KNOWN Submitted by: Orphanet, ClinGen, Genomics England PanelApp
• cardiofaciocutaneous syndrome

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
• Costello syndrome

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
• Noonan syndrome with multiple lentigines

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
• Noonan syndrome-like disorder with loose anagen hair

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

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=0.026776552).

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.2550C>G	p.Asp850Glu	missense	Exon 20 of 36	NP_653271.3	A8K2U0-1
	A2ML1	NM_001282424.3		c.1077C>G	p.Asp359Glu	missense	Exon 9 of 25	NP_001269353.2	A8K2U0-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	A2ML1	ENST00000299698.12	TSL:1 MANE Select	c.2550C>G	p.Asp850Glu	missense	Exon 20 of 36	ENSP00000299698.7	A8K2U0-1
	A2ML1	ENST00000541459.5	TSL:2	c.1200C>G	p.Asp400Glu	missense	Exon 9 of 25	ENSP00000443174.1	H0YGG5
	A2ML1	ENST00000539547.5	TSL:2	c.1077C>G	p.Asp359Glu	missense	Exon 9 of 25	ENSP00000438292.1	A8K2U0-2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 58

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.061
BayesDel_addAF	Benign	-0.36	T
BayesDel_noAF	Benign	-0.75
CADD	Benign	6.5
DANN	Benign	0.18
DEOGEN2	Benign	0.0026	T
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.29	N
LIST_S2	Benign	0.076	T
M_CAP	Benign	0.0041	T
MetaRNN	Benign	0.027	T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	-2.2	N
PhyloP100		0.10
PrimateAI	Benign	0.38	T
PROVEAN	Benign	1.8	N
REVEL	Benign	0.052
Sift	Benign	1.0	T
Sift4G	Benign	1.0	T
Polyphen		0.0	B
Vest4		0.039
MutPred		0.30		Gain of ubiquitination at K852 (P = 0.1278)
MVP		0.055
MPC		0.097
ClinPred		0.042	T
GERP RS		2.0
Varity_R		0.041
gMVP		0.11
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs1860926; hg19: chr12-9004892;