chr19-797499-T-C

Variant names:

• chr19-797499-T-C
• rs1599210325
• NM_002819.5:c.2T>C

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_002819.5(PTBP1):​c.2T>C​(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000705 in 1,418,768 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: PTBP1 NM_002819.5 start_lost
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 1.44
• Publications: 0 publications found

Genes affected

PTBP1 (HGNC:9583): (polypyrimidine tract binding protein 1) This gene belongs to the subfamily of ubiquitously expressed heterogeneous nuclear ribonucleoproteins (hnRNPs). The hnRNPs are RNA-binding proteins and they complex with heterogeneous nuclear RNA (hnRNA). These proteins are associated with pre-mRNAs in the nucleus and appear to influence pre-mRNA processing and other aspects of mRNA metabolism and transport. While all of the hnRNPs are present in the nucleus, some seem to shuttle between the nucleus and the cytoplasm. The hnRNP proteins have distinct nucleic acid binding properties. The protein encoded by this gene has four repeats of quasi-RNA recognition motif (RRM) domains that bind RNAs. This protein binds to the intronic polypyrimidine tracts that requires pre-mRNA splicing and acts via the protein degradation ubiquitin-proteasome pathway. It may also promote the binding of U2 snRNP to pre-mRNAs. This protein is localized in the nucleoplasm and it is also detected in the perinucleolar structure. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PVS1: Start lost variant, next in-frame start position is after 8 pathogenic variants. Next in-frame start position is after 31 codons. Genomic position: 803612. Lost 0.054 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 19-797499-T-C is Pathogenic according to our data. Variant chr19-797499-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 828191.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002819.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PTBP1	NM_002819.5	MANE Select	c.2T>C	p.Met1?	start_lost	Exon 1 of 15	NP_002810.1	P26599-3
	PTBP1	NM_031990.4		c.2T>C	p.Met1?	start_lost	Exon 1 of 15	NP_114367.1	P26599-2
	PTBP1	NM_031991.4		c.2T>C	p.Met1?	start_lost	Exon 1 of 14	NP_114368.1	P26599-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PTBP1	ENST00000356948.11	TSL:1 MANE Select	c.2T>C	p.Met1?	start_lost	Exon 1 of 15	ENSP00000349428.4	P26599-3
	PTBP1	ENST00000394601.8	TSL:1	c.2T>C	p.Met1?	start_lost	Exon 1 of 15	ENSP00000408096.1	P26599-2
	PTBP1	ENST00000349038.8	TSL:1	c.2T>C	p.Met1?	start_lost	Exon 1 of 14	ENSP00000014112.5	P26599-1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.05e-7 AC: 1 AN: 1418768 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 705520

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 29938

American (AMR) AF: 0.00 AC: 0 AN: 41660

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25078

East Asian (EAS) AF: 0.00 AC: 0 AN: 35342

South Asian (SAS) AF: 0.00 AC: 0 AN: 82572

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 44100

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4866

European-Non Finnish (NFE) AF: 9.12e-7 AC: 1 AN: 1096680

Other (OTH) AF: 0.00 AC: 0 AN: 58532

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	-	not provided (1)
1	-	-	PTBP1-related neurodevelopmental disorder with skeletal dysplasia (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.31	D
BayesDel_noAF	Pathogenic	0.21
CADD	Uncertain	24
DANN	Benign	0.91
DEOGEN2	Benign	0.0098	T
Eigen	Benign	0.11
Eigen_PC	Benign	0.20
FATHMM_MKL	Benign	0.69	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.98	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Benign	-1.0	T
PhyloP100		1.4
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.27
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0070	D
Polyphen		0.12	B
Vest4		0.66
MutPred		0.98		Loss of stability (P = 0.0021)
MVP		0.98
ClinPred		0.99	D
GERP RS		4.6
PromoterAI		-0.033	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.89
gMVP		0.34
Mutation Taster		=24/176	disease causing

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: rs1599210325; hg19: chr19-797499;