rs772475317

Positions:

• chr14-102923816-T-C
• chr14-102923816-T-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_030943.4(AMN):​c.149T>C​(p.Phe50Ser) 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 pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: AMN NM_030943.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 1.28

Genes affected

AMN (HGNC:14604): (amnion associated transmembrane protein) The protein encoded by this gene is a type I transmembrane protein. It is thought to modulate bone morphogenetic protein (BMP) receptor function by serving as an accessory or coreceptor, and thus facilitates or hinders BMP binding. It is known that the mouse AMN gene is expressed in the extraembryonic visceral endoderm layer during gastrulation, but it is found to be mutated in amnionless mouse. The encoded protein has sequence similarity to short gastrulation (Sog) and procollagen IIA proteins in Drosophila. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.971

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
AMN	NM_030943.4	c.149T>C	p.Phe50Ser	missense_variant	2/12	ENST00000299155.10	NP_112205.2
AMN	XM_011537202.4	c.-14T>C		5_prime_UTR_variant	2/12		XP_011535504.1
AMN	XM_011537203.4	c.-14T>C		5_prime_UTR_variant	2/12		XP_011535505.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
AMN	ENST00000299155.10	c.149T>C	p.Phe50Ser	missense_variant	2/12	1	NM_030943.4	ENSP00000299155	P1
AMN	ENST00000541086.5	n.895T>C		non_coding_transcript_exon_variant	1/11	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Imerslund-Grasbeck syndrome type 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

3billion

Sep 01, 2022

The variant is not observed in the gnomAD v2.1.1 dataset. While this variant results in missense change, protein truncation variants are a common disease-causing mechanism. In silico tool predictions suggest damaging effect of the variant on gene or gene product (REVEL: 0.74; 3Cnet: 0.59). Therefore, this variant is classified as uncertain significance according to the recommendation of ACMG/AMP guideline. -

Megaloblastic anemia;C0042847:Cobalamin deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Jan 01, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.43	D
BayesDel_noAF	Pathogenic	0.38
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.91	D
Eigen	Benign	-0.049
Eigen_PC	Benign	-0.25
FATHMM_MKL	Benign	0.025	N
LIST_S2	Benign	0.51	T
M_CAP	Pathogenic	0.90	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Uncertain	0.70	D
MutationAssessor	Uncertain	2.4	M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.66	T
PROVEAN	Pathogenic	-6.0	D
REVEL	Pathogenic	0.74
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.99	D
Vest4		0.90
MutPred		0.72		Gain of disorder (P = 0.0014);
MVP		0.93
MPC		1.8
ClinPred		0.99	D
GERP RS		3.3
Varity_R		0.96
gMVP		0.89

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

Publications

LitVar

Other links and lift over

dbSNP: rs772475317; hg19: chr14-103390153;