chr7-100101733-A-C

Position:

• chr7-100101733-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_004722.4(AP4M1):​c.19A>C​(p.Ile7Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000141 in 1,414,808 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: AP4M1 NM_004722.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.00

Genes affected

AP4M1 (HGNC:574): (adaptor related protein complex 4 subunit mu 1) This gene encodes a subunit of the heterotetrameric AP-4 complex. The encoded protein belongs to the adaptor complexes medium subunits family. This AP-4 complex is involved in the recognition and sorting of cargo proteins with tyrosine-based motifs from the trans-golgi network to the endosomal-lysosomal system. [provided by RefSeq, Jul 2008]

MCM7 (HGNC:6950): (minichromosome maintenance complex component 7) The protein encoded by this gene is one of the highly conserved mini-chromosome maintenance proteins (MCM) that are essential for the initiation of eukaryotic genome replication. The hexameric protein complex formed by the MCM proteins is a key component of the pre-replication complex (pre_RC) and may be involved in the formation of replication forks and in the recruitment of other DNA replication related proteins. The MCM complex consisting of this protein and MCM2, 4 and 6 proteins possesses DNA helicase activity, and may act as a DNA unwinding enzyme. Cyclin D1-dependent kinase, CDK4, is found to associate with this protein, and may regulate the binding of this protein with the tumorsuppressor protein RB1/RB. Alternatively spliced transcript variants encoding distinct isoforms have been reported. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AP4M1	NM_004722.4	c.19A>C	p.Ile7Leu	missense_variant	1/15	ENST00000359593.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AP4M1	ENST00000359593.9	c.19A>C	p.Ile7Leu	missense_variant	1/15	1	NM_004722.4	P3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000141 AC: 2 AN: 1414808 Hom.: 0 Cov.: 33 AF XY: 0.00000142 AC XY: 1 AN XY: 703206

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: 0.00

Gnomad4 NFE exome AF: 0.00000185

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 27, 2022

The c.19A>C (p.I7L) alteration is located in exon 1 (coding exon 1) of the AP4M1 gene. This alteration results from a A to C substitution at nucleotide position 19, causing the isoleucine (I) at amino acid position 7 to be replaced by a leucine (L). 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	Benign	0.26
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.030
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.11	T;T;.;T;.
Eigen	Uncertain	0.39
Eigen_PC	Uncertain	0.47
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.96	D;D;.;D;D
M_CAP	Benign	0.066	D
MetaRNN	Uncertain	0.60	D;D;D;D;D
MetaSVM	Uncertain	0.093	D
MutationAssessor	Benign	1.9	.;.;L;.;L
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Pathogenic	0.83	D
PROVEAN	Benign	-1.4	N;N;N;N;N
REVEL	Uncertain	0.55
Sift	Uncertain	0.023	D;D;D;D;D
Sift4G	Benign	0.11	T;T;T;T;T
Polyphen		0.96, 0.78, 0.29	.;D;P;B;P
Vest4		0.55, 0.57, 0.59
MutPred		0.54		Gain of catalytic residue at I7 (P = 0.0745);Gain of catalytic residue at I7 (P = 0.0745);Gain of catalytic residue at I7 (P = 0.0745);Gain of catalytic residue at I7 (P = 0.0745);Gain of catalytic residue at I7 (P = 0.0745);
MVP		0.78
MPC		0.37
ClinPred		0.96	D
GERP RS		5.7
Varity_R		0.69
gMVP		0.62

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs762494123; hg19: chr7-99699356;