14-23321521-G-T

Position:

• chr14-23321521-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The ENST00000216727.9(PABPN1):​c.52G>T​(p.Gly18Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: PABPN1 ENST00000216727.9 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.81

Genes affected

PABPN1 (HGNC:8565): (poly(A) binding protein nuclear 1) This gene encodes an abundant nuclear protein that binds with high affinity to nascent poly(A) tails. The protein is required for progressive and efficient polymerization of poly(A) tails at the 3' ends of eukaryotic transcripts and controls the size of the poly(A) tail to about 250 nt. At steady-state, this protein is localized in the nucleus whereas a different poly(A) binding protein is localized in the cytoplasm. This gene contains a GCG trinucleotide repeat at the 5' end of the coding region, and expansion of this repeat from the normal 6 copies to 8-13 copies leads to autosomal dominant oculopharyngeal muscular dystrophy (OPMD) disease. Related pseudogenes have been identified on chromosomes 19 and X. Read-through transcription also exists between this gene and the neighboring upstream BCL2-like 2 (BCL2L2) gene. [provided by RefSeq, Dec 2010]

BCL2L2-PABPN1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a region_of_interest Disordered (size 114) in uniprot entity PABP2_HUMAN there are 29 pathogenic changes around while only 2 benign (94%) in ENST00000216727.9
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PABPN1	NM_004643.4	c.52G>T	p.Gly18Cys	missense_variant	1/7	ENST00000216727.9	NP_004634.1
BCL2L2-PABPN1	NM_001387343.1	c.529-660G>T		intron_variant			NP_001374272.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PABPN1	ENST00000216727.9	c.52G>T	p.Gly18Cys	missense_variant	1/7	1	NM_004643.4	ENSP00000216727	P1
PABPN1	ENST00000397276.6	c.52G>T	p.Gly18Cys	missense_variant	1/6	1		ENSP00000380446
PABPN1	ENST00000556821.5			upstream_gene_variant		2		ENSP00000451970

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1102220 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 526924

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Jun 07, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.28
BayesDel_addAF	Uncertain	0.020	T
BayesDel_noAF	Benign	-0.21
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.088	T;.
Eigen	Uncertain	0.31
Eigen_PC	Uncertain	0.28
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Benign	0.52	T;T
M_CAP	Pathogenic	0.99	D
MetaRNN	Uncertain	0.50	T;T
MetaSVM	Benign	-0.53	T
MutationAssessor	Benign	0.34	N;N
MutationTaster	Benign	1.0	D;D;D;D
PROVEAN	Benign	-0.20	N;N
REVEL	Benign	0.20
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.99	D;D
Vest4		0.44
MutPred		0.17		Loss of relative solvent accessibility (P = 0.0186);Loss of relative solvent accessibility (P = 0.0186);
MVP		0.55
MPC		0.93
ClinPred		0.67	D
GERP RS		3.4
RBP_binding_hub_radar		1.1
RBP_regulation_power_radar		4.8
Varity_R		0.30
gMVP		0.33

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: rs886043674; hg19: chr14-23790730;