chr14-23321471-T-TGGCGGCGGCGGCGGCGGCGGCGGC

Position:

• chr14-23321471-T-TGGCGGCGGCGGCGGCGGCGGCGGC

Variant summary

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

The ENST00000216727.9(PABPN1):​c.23_24insGGCGGCGGCGGCGGCGGCGGCGGC​(p.Ala4_Ala11dup) variant causes a inframe insertion change involving the alteration of a non-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.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PABPN1 ENST00000216727.9 inframe_insertion
• Clinical Significance: Not reported in ClinVar
• 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.23_24insGGCGGCGGCGGCGGCGGCGGCGGC	p.Ala4_Ala11dup	inframe_insertion	1/7	ENST00000216727.9	NP_004634.1
BCL2L2-PABPN1	NM_001387343.1	c.529-689_529-688insGGCGGCGGCGGCGGCGGCGGCGGC		intron_variant			NP_001374272.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PABPN1	ENST00000216727.9	c.23_24insGGCGGCGGCGGCGGCGGCGGCGGC	p.Ala4_Ala11dup	inframe_insertion	1/7	1	NM_004643.4	ENSP00000216727	P1
PABPN1	ENST00000397276.6	c.23_24insGGCGGCGGCGGCGGCGGCGGCGGC	p.Ala4_Ala11dup	inframe_insertion	1/6	1		ENSP00000380446

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs193922941; hg19: chr14-23790680;