7-16088412-CTTTTTTTTTTTTT-CTTTTTTTTTTTTTTTTTTTTTTTT

Variant names:

• chr7-16088412-C-CTTTTTTTTTTT
• rs71549971
• NM_001101426.4:c.*3272_*3282dupAAAAAAAAAAA

Variant summary

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

The NM_001101426.4(CRPPA):​c.*3272_*3282dupAAAAAAAAAAA variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. It is difficult to determine the true allele frequency of this variant because it is of type INS_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.0000088 (0 hom., cov: 0)
• Consequence: CRPPA NM_001101426.4 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.953
• Publications: 0 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 Gene-Disease associations (from GenCC):

• muscular dystrophy-dystroglycanopathy (congenital with brain and eye anomalies), type A, 7

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• myopathy caused by variation in CRPPA

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• autosomal recessive limb-girdle muscular dystrophy type 2U

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• congenital muscular dystrophy without intellectual disability

  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 0 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CRPPA	NM_001101426.4	c.*3272_*3282dupAAAAAAAAAAA		3_prime_UTR_variant	Exon 10 of 10	ENST00000407010.7	NP_001094896.1
CRPPA	NR_160656.1	n.4693_4703dupAAAAAAAAAAA		non_coding_transcript_exon_variant	Exon 8 of 8
CRPPA	NM_001368197.1	c.*3272_*3282dupAAAAAAAAAAA		3_prime_UTR_variant	Exon 9 of 9		NP_001355126.1
CRPPA	NM_001101417.4	c.*3272_*3282dupAAAAAAAAAAA		3_prime_UTR_variant	Exon 9 of 9		NP_001094887.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CRPPA	ENST00000407010.7	c.*3272_*3282dupAAAAAAAAAAA		3_prime_UTR_variant	Exon 10 of 10	5	NM_001101426.4	ENSP00000385478.2

Frequencies

GnomAD3 genomes AF: 0.00000884 AC: 1 AN: 113142 Hom.: 0 Cov.: 0

Gnomad AFR AF: 0.0000362

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 0

GnomAD4 genome AF: 0.00000884 AC: 1 AN: 113142 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 52524

African (AFR) AF: 0.0000362 AC: 1 AN: 27610

American (AMR) AF: 0.00 AC: 0 AN: 9500

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 2936

East Asian (EAS) AF: 0.00 AC: 0 AN: 3702

South Asian (SAS) AF: 0.00 AC: 0 AN: 3842

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 4482

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 182

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 58568

Other (OTH) AF: 0.00 AC: 0 AN: 1544

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.95

Splicing

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

Other links and lift over

dbSNP: rs71549971; hg19: chr7-16128037;