chr4-55991996-G-C

Variant names:

• chr4-55991996-G-C
• rs375822537
• NM_025009.5:c.1920G>C

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_025009.5(CEP135):​c.1920G>C​(p.Ser640Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000416 in 1,442,052 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. S640S) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000042 (0 hom.)
• Consequence: CEP135 NM_025009.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.885
• Publications: 0 publications found

Genes affected

CEP135 (HGNC:29086): (centrosomal protein 135) This gene encodes a centrosomal protein, which acts as a scaffolding protein during early centriole biogenesis, and is also required for centriole-centriole cohesion during interphase. Mutations in this gene are associated with autosomal recessive primary microcephaly-8. [provided by RefSeq, Jun 2012]

CEP135 Gene-Disease associations (from GenCC):

• microcephaly 8, primary, autosomal recessive

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• autosomal recessive primary microcephaly

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000299857 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).
• BP7: Synonymous conserved (PhyloP=0.885 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_025009.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CEP135	NM_025009.5	MANE Select	c.1920G>C	p.Ser640Ser	synonymous	Exon 15 of 26	NP_079285.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CEP135	ENST00000257287.5	TSL:1 MANE Select	c.1920G>C	p.Ser640Ser	synonymous	Exon 15 of 26	ENSP00000257287.3
	CEP135	ENST00000506202.1	TSL:1	n.1870G>C		non_coding_transcript_exon	Exon 8 of 19
	ENSG00000299857	ENST00000766957.1		n.107+5456C>G		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000416 AC: 6 AN: 1442052 Hom.: 0 Cov.: 28 AF XY: 0.00000418 AC XY: 3 AN XY: 718010

African (AFR) AF: 0.00 AC: 0 AN: 32858

American (AMR) AF: 0.00 AC: 0 AN: 43278

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25970

East Asian (EAS) AF: 0.00 AC: 0 AN: 39302

South Asian (SAS) AF: 0.00 AC: 0 AN: 84166

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53380

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5704

European-Non Finnish (NFE) AF: 0.00000547 AC: 6 AN: 1097666

Other (OTH) AF: 0.00 AC: 0 AN: 59728

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	1.2
DANN	Benign	0.60
PhyloP100		0.89

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: rs375822537; hg19: chr4-56858162;