chr19-49795704-G-T

Position:

• chr19-49795704-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_130787.3(AP2A1):​c.780G>T​(p.Lys260Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000659 in 151,670 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: 𝑓 0.0000066 (0 hom., cov: 31)
  • Exomes 𝑓: 0.0000021 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: AP2A1 NM_130787.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.954

Genes affected

AP2A1 (HGNC:561): (adaptor related protein complex 2 subunit alpha 1) This gene encodes the alpha 1 adaptin subunit of the adaptor protein 2 (AP-2) complex found in clathrin coated vesicles. The AP-2 complex is a heterotetramer consisting of two large adaptins (alpha or beta), a medium adaptin (mu), and a small adaptin (sigma). The complex is part of the protein coat on the cytoplasmic face of coated vesicles which links clathrin to receptors in vesicles. Alternative splicing of this gene results in two transcript variants encoding two different isoforms. A third transcript variant has been described, but its full length nature has not been determined. [provided by RefSeq, Jul 2008]

AP2A1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.886

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
AP2A1	NM_130787.3	c.780G>T	p.Lys260Asn	missense_variant	7/23	ENST00000354293.10	NP_570603.2
AP2A1	NM_014203.3	c.780G>T	p.Lys260Asn	missense_variant	7/24		NP_055018.2
AP2A1	XM_011526556.3	c.831G>T	p.Lys277Asn	missense_variant	7/24		XP_011524858.1
AP2A1	XM_011526557.4	c.831G>T	p.Lys277Asn	missense_variant	7/23		XP_011524859.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
AP2A1	ENST00000354293.10	c.780G>T	p.Lys260Asn	missense_variant	7/23	1	NM_130787.3	ENSP00000346246.4
AP2A1	ENST00000359032.10	c.780G>T	p.Lys260Asn	missense_variant	7/24	5		ENSP00000351926.4
AP2A1	ENST00000597774.5	n.*118G>T		non_coding_transcript_exon_variant	5/22	5		ENSP00000472492.1
AP2A1	ENST00000597774.5	n.*118G>T		3_prime_UTR_variant	5/22	5		ENSP00000472492.1

Frequencies

GnomAD3 genomes AF: 0.00000659 AC: 1 AN: 151670 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000213 AC: 3 AN: 1411630 Hom.: 0 Cov.: 33 AF XY: 0.00000143 AC XY: 1 AN XY: 697720

Gnomad4 AFR exome AF: 0.00

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: 0.0000208

Gnomad4 NFE exome AF: 0.00000184

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00000659 AC: 1 AN: 151670 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 74048

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 17, 2021

The c.780G>T (p.K260N) alteration is located in exon 7 (coding exon 7) of the AP2A1 gene. This alteration results from a G to T substitution at nucleotide position 780, causing the lysine (K) at amino acid position 260 to be replaced by an asparagine (N). 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	1.0
BayesDel_addAF	Benign	-0.039	T
BayesDel_noAF	Benign	-0.29
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.48	.;T
Eigen	Pathogenic	0.69
Eigen_PC	Uncertain	0.61
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Uncertain	0.10	D
MetaRNN	Pathogenic	0.89	D;D
MetaSVM	Benign	-0.63	T
MutationAssessor	Pathogenic	2.9	M;M
PrimateAI	Pathogenic	0.86	D
PROVEAN	Uncertain	-4.2	D;D
REVEL	Uncertain	0.29
Sift	Uncertain	0.0010	D;D
Sift4G	Uncertain	0.014	D;D
Polyphen		1.0	D;D
Vest4		0.87
MutPred		0.66		Loss of ubiquitination at K260 (P = 0.0341);Loss of ubiquitination at K260 (P = 0.0341);
MVP		0.72
MPC		2.6
ClinPred		0.99	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.73
gMVP		0.88

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: rs1221253938; hg19: chr19-50298961;