19-16227611-G-A

Variant names:

• chr19-16227611-G-A
• rs1399686897
• NM_032493.4:c.737G>A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_032493.4(AP1M1):​c.737G>A​(p.Arg246His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,814 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: AP1M1 NM_032493.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.70

Genes affected

AP1M1 (HGNC:13667): (adaptor related protein complex 1 subunit mu 1) The protein encoded by this gene is the medium chain of the trans-Golgi network clathrin-associated protein complex AP-1. The other components of this complex are beta-prime-adaptin, gamma-adaptin, and the small chain AP1S1. This complex is located at the Golgi vesicle and links clathrin to receptors in coated vesicles. These vesicles are involved in endocytosis and Golgi processing. Alternatively spliced transcript variants encoding distinct protein isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.839

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AP1M1	NM_032493.4	c.737G>A	p.Arg246His	missense_variant	Exon 7 of 12	ENST00000291439.8	NP_115882.1
AP1M1	NM_001130524.2	c.773G>A	p.Arg258His	missense_variant	Exon 8 of 13		NP_001123996.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AP1M1	ENST00000291439.8	c.737G>A	p.Arg246His	missense_variant	Exon 7 of 12	1	NM_032493.4	ENSP00000291439.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251436 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135888

Gnomad AFR exome AF: 0.0000615

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461814 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 727220

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Apr 13, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.773G>A (p.R258H) alteration is located in exon 8 (coding exon 8) of the AP1M1 gene. This alteration results from a G to A substitution at nucleotide position 773, causing the arginine (R) at amino acid position 258 to be replaced by a histidine (H). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.91
BayesDel_addAF	Benign	-0.082	T
BayesDel_noAF	Benign	-0.17
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.27	T;T;.;.
Eigen	Pathogenic	0.76
Eigen_PC	Uncertain	0.60
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D;D;D
M_CAP	Benign	0.057	D
MetaRNN	Pathogenic	0.84	D;D;D;D
MetaSVM	Benign	-0.53	T
MutationAssessor	Pathogenic	4.0	H;.;.;.
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-4.7	D;.;D;D
REVEL	Uncertain	0.37
Sift	Uncertain	0.0010	D;.;D;D
Sift4G	Uncertain	0.0030	D;D;D;D
Polyphen		1.0	D;.;D;.
Vest4		0.68
MutPred		0.66		Loss of phosphorylation at S245 (P = 0.1039);.;Loss of phosphorylation at S245 (P = 0.1039);.;
MVP		0.78
MPC		2.6
ClinPred		1.0	D
GERP RS		3.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.58
gMVP		0.59

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: rs1399686897; hg19: chr19-16338422;