1-113904677-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001253852.3(AP4B1):c.41A>G(p.Lys14Arg) 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 benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: AP4B1 NM_001253852.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.02

Genes affected

AP4B1 (HGNC:572): (adaptor related protein complex 4 subunit beta 1) This gene encodes a subunit of a heterotetrameric adapter-like complex 4 that is involved in targeting proteins from the trans-Golgi network to the endosomal-lysosomal system. Mutations in this gene are associated with cerebral palsy spastic quadriplegic type 5 (CPSQ5) disorder. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2011]

DCLRE1B (HGNC:17641): (DNA cross-link repair 1B) DNA interstrand cross-links prevent strand separation, thereby physically blocking transcription, replication, and segregation of DNA. DCLRE1B is one of several evolutionarily conserved genes involved in repair of interstrand cross-links (Dronkert et al., 2000 [PubMed 10848582]).[supplied by OMIM, Mar 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.15685606).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AP4B1	NM_001253852.3	c.41A>G	p.Lys14Arg	missense_variant	1/10	ENST00000369569.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AP4B1	ENST00000369569.6	c.41A>G	p.Lys14Arg	missense_variant	1/10	1	NM_001253852.3	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary spastic paraplegia 47 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Aug 06, 2023

This variant has not been reported in the literature in individuals affected with AP4B1-related conditions. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt AP4B1 protein function. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces lysine, which is basic and polar, with arginine, which is basic and polar, at codon 14 of the AP4B1 protein (p.Lys14Arg). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.076
BayesDel_addAF	Benign	-0.088	T
BayesDel_noAF	Benign	-0.36
Cadd	Benign	18
Dann	Uncertain	0.99
DEOGEN2	Benign	0.092	T;T;T;T;T;T
Eigen	Benign	-0.36
Eigen_PC	Benign	-0.10
FATHMM_MKL	Benign	0.19	N
LIST_S2	Benign	0.85	T;.;T;D;T;D
M_CAP	Benign	0.012	T
MetaRNN	Benign	0.16	T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	0.90	D;D;N;N
PrimateAI	Uncertain	0.74	T
PROVEAN	Benign	-0.38	N;N;N;N;N;N
REVEL	Benign	0.072
Sift	Pathogenic	0.0	D;T;T;T;T;T
Sift4G	Benign	0.62	T;T;T;.;.;.
Polyphen		0.046	B;B;B;.;.;.
Vest4		0.23
MutPred		0.55		Loss of ubiquitination at K14 (P = 0.0326);Loss of ubiquitination at K14 (P = 0.0326);Loss of ubiquitination at K14 (P = 0.0326);Loss of ubiquitination at K14 (P = 0.0326);Loss of ubiquitination at K14 (P = 0.0326);Loss of ubiquitination at K14 (P = 0.0326);
MVP		0.57
MPC		0.10
ClinPred		0.54	D
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.7
Varity_R		0.21
gMVP		0.24

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-114447299;