8-67179871-T-C

Position:

• chr8-67179871-T-C

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_001382391.1(CSPP1):​c.3165T>C​(p.Asp1055=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00353 in 1,594,980 control chromosomes in the GnomAD database, including 8 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0022 (1 hom., cov: 32)
  • Exomes 𝑓: 0.0037 (7 hom.)
• Consequence: CSPP1 NM_001382391.1 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6
• Conservation: PhyloP100: 0.247

Genes affected

CSPP1 (HGNC:26193): (centrosome and spindle pole associated protein 1) This gene encodes a centrosome and spindle pole associated protein. The encoded protein plays a role in cell-cycle progression and spindle organization, regulates cytokinesis, interacts with Nephrocystin 8 and is required for cilia formation. Mutations in this gene result in primary cilia abnormalities and classical Joubert syndrome. Alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, Apr 2014]

ARFGEF1 (HGNC:15772): (ADP ribosylation factor guanine nucleotide exchange factor 1) ADP-ribosylation factors (ARFs) play an important role in intracellular vesicular trafficking. The protein encoded by this gene is involved in the activation of ARFs by accelerating replacement of bound GDP with GTP. It contains a Sec7 domain, which may be responsible for guanine-nucleotide exchange activity and also brefeldin A inhibition. [provided by RefSeq, Aug 2011]

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.68).
• BP6: Variant 8-67179871-T-C is Benign according to our data. Variant chr8-67179871-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 434844.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr8-67179871-T-C is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=0.247 with no splicing effect.
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00217 (331/152258) while in subpopulation NFE AF= 0.00413 (281/68014). AF 95% confidence interval is 0.00373. There are 1 homozygotes in gnomad4. There are 150 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAdExome4 at 7 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CSPP1	NM_001382391.1	c.3165T>C	p.Asp1055=	synonymous_variant	28/31	ENST00000678616.1	NP_001369320.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CSPP1	ENST00000678616.1	c.3165T>C	p.Asp1055=	synonymous_variant	28/31		NM_001382391.1	ENSP00000504733

Frequencies

GnomAD3 genomes AF: 0.00218 AC: 331 AN: 152140 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.000845

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000327

Gnomad ASJ AF: 0.00115

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000189

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00413

Gnomad OTH AF: 0.00192

GnomAD3 exomes AF: 0.00187 AC: 462 AN: 247682 Hom.: 1 AF XY: 0.00187 AC XY: 251 AN XY: 134338

Gnomad AFR exome AF: 0.000970

Gnomad AMR exome AF: 0.000205

Gnomad ASJ exome AF: 0.000498

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.000422

Gnomad NFE exome AF: 0.00369

Gnomad OTH exome AF: 0.00166

GnomAD4 exome AF: 0.00368 AC: 5303 AN: 1442722 Hom.: 7 Cov.: 26 AF XY: 0.00346 AC XY: 2490 AN XY: 718928

Gnomad4 AFR exome AF: 0.000634

Gnomad4 AMR exome AF: 0.000180

Gnomad4 ASJ exome AF: 0.000424

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000117

Gnomad4 FIN exome AF: 0.000642

Gnomad4 NFE exome AF: 0.00465

Gnomad4 OTH exome AF: 0.00214

GnomAD4 genome AF: 0.00217 AC: 331 AN: 152258 Hom.: 1 Cov.: 32 AF XY: 0.00202 AC XY: 150 AN XY: 74438

Gnomad4 AFR AF: 0.000842

Gnomad4 AMR AF: 0.000327

Gnomad4 ASJ AF: 0.00115

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.000189

Gnomad4 NFE AF: 0.00413

Gnomad4 OTH AF: 0.00190

Alfa AF: 0.00376 Hom.: 4

Bravo AF: 0.00223

EpiCase AF: 0.00354

EpiControl AF: 0.00314

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:4

Likely benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Feb 16, 2021	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Mar 01, 2024	CSPP1: BP4, BP7 -

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Mar 04, 2016

- -

Joubert syndrome 21 Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 29, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.68
CADD	Benign	8.6
DANN	Benign	0.86

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.14		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: rs10112748; hg19: chr8-68092106; COSMIC: COSV99138122;