chr8-43122584-G-C

Variant names:

• chr8-43122584-G-C
• rs34715198
• NM_032237.5:c.760G>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_032237.5(POMK):​c.760G>C​(p.Val254Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. V254M) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: POMK NM_032237.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.59
• Publications: 0 publications found

Genes affected

POMK (HGNC:26267): (protein O-mannose kinase) This gene encodes a protein that may be involved in the presentation of the laminin-binding O-linked carbohydrate chain of alpha-dystroglycan (a-DG), which forms transmembrane linkages between the extracellular matrix and the exoskeleton. Some pathogens use this O-linked carbohydrate unit for host entry. Loss of function compound heterozygous mutations in this gene were found in a human patient affected by the Walker-Warburg syndrome (WWS) phenotype. Mice lacking this gene contain misplaced neurons (heterotopia) in some regions of the brain, possibly from defects in neuronal migration. Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, May 2013]

POMK Gene-Disease associations (from GenCC):

• muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type a, 12

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Genomics England PanelApp, G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• congenital muscular dystrophy with cerebellar involvement

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• limb-girdle muscular dystrophy due to POMK deficiency

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• muscular dystrophy-dystroglycanopathy, type A

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
POMK	NM_032237.5	c.760G>C	p.Val254Leu	missense_variant	Exon 5 of 5	ENST00000331373.10	NP_115613.1
POMK	NM_001277971.2	c.760G>C	p.Val254Leu	missense_variant	Exon 4 of 4		NP_001264900.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
POMK	ENST00000331373.10	c.760G>C	p.Val254Leu	missense_variant	Exon 5 of 5	2	NM_032237.5	ENSP00000331258.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.40
BayesDel_addAF	Uncertain	0.022	T
BayesDel_noAF	Benign	-0.21
CADD	Uncertain	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.031	T;T
Eigen	Uncertain	0.47
Eigen_PC	Uncertain	0.49
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.91	D;.
M_CAP	Benign	0.020	T
MetaRNN	Uncertain	0.66	D;D
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.8	L;L
PhyloP100		7.6
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-2.0	.;N
REVEL	Benign	0.17
Sift	Benign	0.079	.;T
Sift4G	Benign	0.11	T;T
Polyphen		0.97	D;D
Vest4		0.71
MutPred		0.62		Gain of helix (P = 0.0696);Gain of helix (P = 0.0696);
MVP		0.48
MPC		0.11
ClinPred		0.83	D
GERP RS		4.4
PromoterAI		-0.023	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.13
gMVP		0.73
Mutation Taster		=65/35	polymorphism

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: rs34715198; hg19: chr8-42977727;