7-16216198-C-T

Variant names:

• chr7-16216198-C-T
• rs397515396
• NM_001101426.4:c.1120-1G>A

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PVS1_Moderate PM2

The NM_001101426.4(CRPPA):​c.1120-1G>A variant causes a splice acceptor, intron change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CRPPA NM_001101426.4 splice_acceptor, intron
• Scores: Splicing: ADA: 0.9999
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.90
• Publications: 3 publications found

Genes affected

CRPPA (HGNC:37276): (CDP-L-ribitol pyrophosphorylase A) This gene encodes a 2-C-methyl-D-erythritol 4-phosphate cytidylyltransferase-like protein. Mutations in this gene are the cause of Walker-Warburg syndrome. Alternate splicing results in multiple transcript variants. [provided by RefSeq, May 2012]

CRPPA-AS1 (HGNC:48962): (CRPPA antisense RNA 1)

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.097345136 fraction of the gene. Cryptic splice site detected, with MaxEntScore 4.7, offset of 1, new splice context is: tgtcttttatattttgcaAGttc. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in inframe change.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001101426.4. 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
	CRPPA	NM_001101426.4	MANE Select	c.1120-1G>A		splice_acceptor intron	N/A	NP_001094896.1	A4D126-1
	CRPPA	NM_001368197.1		c.1015-1G>A		splice_acceptor intron	N/A	NP_001355126.1
	CRPPA	NM_001101417.4		c.970-1G>A		splice_acceptor intron	N/A	NP_001094887.1	A0A140VJM1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CRPPA	ENST00000407010.7	TSL:5 MANE Select	c.1120-1G>A		splice_acceptor intron	N/A	ENSP00000385478.2	A4D126-1
	CRPPA	ENST00000399310.3	TSL:1	c.970-1G>A		splice_acceptor intron	N/A	ENSP00000382249.3	A4D126-2
	CRPPA-AS1	ENST00000438573.5	TSL:1	n.116+5595C>T		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00 AC: 0 AN: 211388 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1401712 Hom.: 0 Cov.: 25 AF XY: 0.00 AC XY: 0 AN XY: 698026

African (AFR) AF: 0.00 AC: 0 AN: 31274

American (AMR) AF: 0.00 AC: 0 AN: 38206

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24662

East Asian (EAS) AF: 0.00 AC: 0 AN: 38990

South Asian (SAS) AF: 0.00 AC: 0 AN: 80018

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52682

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5550

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1072130

Other (OTH) AF: 0.00 AC: 0 AN: 58200

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000151

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.20
CADD	Pathogenic	32
DANN	Uncertain	0.99
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Uncertain	0.88	D
PhyloP100		3.9
GERP RS		5.2
Mutation Taster		=1/99	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.94
SpliceAI score (max)		0.97		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.97		Position offset: -1

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

Other links and lift over

dbSNP: rs397515396; hg19: chr7-16255823;