7-100105314-C-G

Variant names:

• chr7-100105314-C-G
• rs780030221
• NM_004722.4:c.802C>G

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_004722.4(AP4M1):​c.802C>G​(p.Arg268Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,888 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R268Q) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: AP4M1 NM_004722.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.15
• Publications: 0 publications found

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]

AP4M1 Gene-Disease associations (from GenCC):

• AP-4 deficiency syndrome

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• hereditary spastic paraplegia 50

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• AP4-related intellectual disability and spastic paraplegia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000295556 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.974

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004722.4. 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
	AP4M1	NM_004722.4	MANE Select	c.802C>G	p.Arg268Gly	missense	Exon 10 of 15	NP_004713.2
	AP4M1	NM_001363671.2		c.823C>G	p.Arg275Gly	missense	Exon 10 of 15	NP_001350600.1	C9JC87
	AP4M1	NM_001438824.1		c.823C>G	p.Arg275Gly	missense	Exon 11 of 16	NP_001425753.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	AP4M1	ENST00000359593.9	TSL:1 MANE Select	c.802C>G	p.Arg268Gly	missense	Exon 10 of 15	ENSP00000352603.4	O00189
	AP4M1	ENST00000421755.5	TSL:1	c.802C>G	p.Arg268Gly	missense	Exon 10 of 16	ENSP00000412185.1	O00189
	AP4M1	ENST00000429084.5	TSL:5	c.823C>G	p.Arg275Gly	missense	Exon 10 of 15	ENSP00000403663.1	C9JC87

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461888 Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1 AN XY: 727242

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53414

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1112012

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.86
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.12
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.22	T
Eigen	Pathogenic	0.78
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.90	D
M_CAP	Benign	0.065	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Benign	-0.69	T
MutationAssessor	Pathogenic	3.6	H
PhyloP100		1.2
PrimateAI	Uncertain	0.65	T
PROVEAN	Pathogenic	-6.5	D
REVEL	Uncertain	0.64
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.92
MutPred		0.92		Loss of phosphorylation at S273 (P = 0.1351)
MVP		0.60
MPC		0.59
ClinPred		1.0	D
GERP RS		5.1
PromoterAI		-0.0090	Neutral
Varity_R		0.94
gMVP		0.73
Mutation Taster		=34/66	disease causing

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

Other links and lift over

dbSNP: rs780030221; hg19: chr7-99702937;