rs144750655

Positions:

chr1-6474166-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 5P and 1B. PVS1_ModeratePM2PP5BS1_Supporting

The NM_020631.6(PLEKHG5):c.440-2A>G variant causes a splice acceptor change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00047 in 1,613,328 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00026 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00049 ( 0 hom. )

Consequence

PLEKHG5
NM_020631.6 splice_acceptor

Scores

Splicing: ADA: 0.9192

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:4U:2

Conservation

PhyloP100: -2.05

Variant links:

Genes affected

PLEKHG5 (HGNC:29105): (pleckstrin homology and RhoGEF domain containing G5) This gene encodes a protein that activates the nuclear factor kappa B (NFKB1) signaling pathway. Mutations in this gene are associated with autosomal recessive distal spinal muscular atrophy. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2012]

PLEKHG5 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PVS1

Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.04998345 fraction of the gene. Cryptic splice site detected, with MaxEntScore 6.6, offset of -39, new splice context is: gggaccccctcctccaccAGacc. Cryptic site results in inframe change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 1-6474166-T-C is Pathogenic according to our data. Variant chr1-6474166-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 423836.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=4, Uncertain_significance=2}.

BS1

Variant frequency is greater than expected in population nfe. gnomad4_exome allele frequency = 0.000492 (719/1461024) while in subpopulation NFE AF= 0.000621 (691/1111940). AF 95% confidence interval is 0.000583. There are 0 homozygotes in gnomad4_exome. There are 337 alleles in male gnomad4_exome subpopulation. Median coverage is 38. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PLEKHG5	NM_020631.6 linkuse as main transcript	c.440-2A>G		splice_acceptor_variant		ENST00000377728.8	NP_065682.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PLEKHG5	ENST00000377728.8 linkuse as main transcript	c.440-2A>G		splice_acceptor_variant		2	NM_020631.6	ENSP00000366957	P2	O94827-5

Frequencies

GnomAD3 genomes

AF:

0.000256

AC:

AN:

152186

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000327

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000412

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000165

AC:

AN:

249072

Hom.:

AF XY:

0.000163

AC XY:

AN XY:

135260

show subpopulations

Gnomad AFR exome

AF:

0.000188

Gnomad AMR exome

AF:

0.0000870

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000466

Gnomad NFE exome

AF:

0.000276

Gnomad OTH exome

AF:

0.000493

GnomAD4 exome

AF:

0.000492

AC:

719

AN:

1461024

Hom.:

Cov.:

AF XY:

0.000464

AC XY:

337

AN XY:

726802

show subpopulations

Gnomad4 AFR exome

AF:

0.000119

Gnomad4 AMR exome

AF:

0.000157

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.0000190

Gnomad4 NFE exome

AF:

0.000621

Gnomad4 OTH exome

AF:

0.000199

GnomAD4 genome

AF:

0.000256

AC:

AN:

152304

Hom.:

Cov.:

AF XY:

0.000228

AC XY:

AN XY:

74462

show subpopulations

Gnomad4 AFR

AF:

0.000120

Gnomad4 AMR

AF:

0.000327

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000412

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000300

Hom.:

Bravo

AF:

0.000268

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.000349

AC:

ExAC

AF:

0.000190

AC:

EpiCase

AF:

0.000327

EpiControl

AF:

0.000652

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:4Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Pathogenic:2Uncertain:1

Likely pathogenic, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Aug 05, 2019	PVS1, PM2 -
Likely pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Oct 14, 2019	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Feb 24, 2022	Canonical splice site variant predicted to result in a null allele in a gene for which loss-of-function is a known mechanism of disease; Has not been previously published as pathogenic or benign to our knowledge; This variant is associated with the following publications: (PMID: 31589614) -

Neuronopathy, distal hereditary motor, autosomal recessive 4;C3809309:Charcot-Marie-Tooth disease recessive intermediate C

Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Oct 31, 2018	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 04, 2024	This sequence change affects an acceptor splice site in intron 6 of the PLEKHG5 gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in PLEKHG5 are known to be pathogenic (PMID: 17564964, 23777631). This variant is present in population databases (rs144750655, gnomAD 0.03%). This variant has not been reported in the literature in individuals affected with PLEKHG5-related conditions. ClinVar contains an entry for this variant (Variation ID: 423836). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 03, 2022

The c.440-2A>G intronic variant results from an A to G substitution two nucleotides upstream from coding exon 6 in the PLEKHG5 gene. Alterations that disrupt the canonical splice site are expected to result in aberrant splicing. In silico splice site analysis predicts that this alteration will weaken the native splice acceptor site and will result in the creation or strengthening of a novel splice acceptor site. The resulting transcript is predicted to be in-frame and is not expected to trigger nonsense-mediated mRNA decay; however, direct evidence is unavailable. The exact functional effect of the altered amino acid sequence is unknown. This nucleotide position is poorly conserved in available vertebrate species. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.40

BayesDel_noAF

Benign

-1.0

CADD

Benign

DANN

Benign

0.33

Eigen

Benign

-0.78

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.010

MutationTaster

Benign

1.0

N;N;N;N;N;N;N;N;N;N;N;N;N

GERP RS

-4.9

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.92

dbscSNV1_RF

Benign

0.28

SpliceAI score (max)

0.97

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.89

Position offset: -8

DS_AL_spliceai

0.97

Position offset: -2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over