Mutations in GRM6 identified in consanguineous Pakistani families with congenital stationary night blindness

Muhammad Asif Naeem, Alexander D H Gottsch, Inayat Ullah, Shaheen N. Khan, Tayyab Husnain, Nadeem H. Butt, Zaheeruddin A. Qazi, Javed Akram, Sheikh Riazuddin, Radha Ayyagari, J. Fielding Hejtmancik, Sheikh Amer Riazuddin

Research output: Contribution to journalArticle

Abstract

Purpose: This study was undertaken to investigate the causal mutations responsible for autosomal recessive congenital stationary night blindness (CSNB) in consanguineous Pakistani families. Methods: Two consanguineous families with multiple individuals manifesting symptoms of stationary night blindness were recruited. Affected individuals underwent a detailed ophthalmological examination, including fundus examination and electroretinography. Blood samples were collected and genomic DNA was extracted. Exclusion analyses were completed by genotyping closely spaced microsatellite markers, and two-point logarithm of odds (LOD) scores were calculated. All coding exons, along with the exon–intron boundaries of GRM6, were sequenced bidirectionally. Results: According to the medical history available to us, affected individuals in both families had experienced night blindness from the early years of their lives. Fundus photographs of affected individuals in both the families appeared normal, with no signs of attenuated arteries or bone spicule pigmentation. The scotopic electroretinogram (ERG) response were absent in all of the affected individuals, while the photopic measurements show reduced b-waves. During exclusion analyses, both families localized to a region on chromosome 5q that harbors GRM6, a gene previously associated with autosomal recessive CSNB. Bidirectional sequencing of GRM6 identified homozygous single base pair changes, specifically c.1336C>T (p.R446X) and c.2267G>A (p.G756D) in families PKRP170 and PKRP172, respectively. Conclusions: We identified a novel nonsense and a previously reported missense mutation in GRM6 that were responsible for autosomal recessive CSNB in patients of Pakistani decent.

Original languageEnglish (US)
Pages (from-to)1261-1271
Number of pages11
JournalMolecular Vision
Volume21
StatePublished - Oct 31 2015

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Mutation
Night Blindness
Electroretinography
Pigmentation
Missense Mutation
Base Pairing
Microsatellite Repeats
Congenital stationary night blindness
Exons
Arteries
Chromosomes
Bone and Bones
DNA
Genes

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Naeem, M. A., Gottsch, A. D. H., Ullah, I., Khan, S. N., Husnain, T., Butt, N. H., ... Riazuddin, S. A. (2015). Mutations in GRM6 identified in consanguineous Pakistani families with congenital stationary night blindness. Molecular Vision, 21, 1261-1271.

Mutations in GRM6 identified in consanguineous Pakistani families with congenital stationary night blindness. / Naeem, Muhammad Asif; Gottsch, Alexander D H; Ullah, Inayat; Khan, Shaheen N.; Husnain, Tayyab; Butt, Nadeem H.; Qazi, Zaheeruddin A.; Akram, Javed; Riazuddin, Sheikh; Ayyagari, Radha; Hejtmancik, J. Fielding; Riazuddin, Sheikh Amer.

In: Molecular Vision, Vol. 21, 31.10.2015, p. 1261-1271.

Research output: Contribution to journalArticle

Naeem, MA, Gottsch, ADH, Ullah, I, Khan, SN, Husnain, T, Butt, NH, Qazi, ZA, Akram, J, Riazuddin, S, Ayyagari, R, Hejtmancik, JF & Riazuddin, SA 2015, 'Mutations in GRM6 identified in consanguineous Pakistani families with congenital stationary night blindness', Molecular Vision, vol. 21, pp. 1261-1271.
Naeem MA, Gottsch ADH, Ullah I, Khan SN, Husnain T, Butt NH et al. Mutations in GRM6 identified in consanguineous Pakistani families with congenital stationary night blindness. Molecular Vision. 2015 Oct 31;21:1261-1271.
Naeem, Muhammad Asif ; Gottsch, Alexander D H ; Ullah, Inayat ; Khan, Shaheen N. ; Husnain, Tayyab ; Butt, Nadeem H. ; Qazi, Zaheeruddin A. ; Akram, Javed ; Riazuddin, Sheikh ; Ayyagari, Radha ; Hejtmancik, J. Fielding ; Riazuddin, Sheikh Amer. / Mutations in GRM6 identified in consanguineous Pakistani families with congenital stationary night blindness. In: Molecular Vision. 2015 ; Vol. 21. pp. 1261-1271.
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AU - Husnain, Tayyab

AU - Butt, Nadeem H.

AU - Qazi, Zaheeruddin A.

AU - Akram, Javed

AU - Riazuddin, Sheikh

AU - Ayyagari, Radha

AU - Hejtmancik, J. Fielding

AU - Riazuddin, Sheikh Amer

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N2 - Purpose: This study was undertaken to investigate the causal mutations responsible for autosomal recessive congenital stationary night blindness (CSNB) in consanguineous Pakistani families. Methods: Two consanguineous families with multiple individuals manifesting symptoms of stationary night blindness were recruited. Affected individuals underwent a detailed ophthalmological examination, including fundus examination and electroretinography. Blood samples were collected and genomic DNA was extracted. Exclusion analyses were completed by genotyping closely spaced microsatellite markers, and two-point logarithm of odds (LOD) scores were calculated. All coding exons, along with the exon–intron boundaries of GRM6, were sequenced bidirectionally. Results: According to the medical history available to us, affected individuals in both families had experienced night blindness from the early years of their lives. Fundus photographs of affected individuals in both the families appeared normal, with no signs of attenuated arteries or bone spicule pigmentation. The scotopic electroretinogram (ERG) response were absent in all of the affected individuals, while the photopic measurements show reduced b-waves. During exclusion analyses, both families localized to a region on chromosome 5q that harbors GRM6, a gene previously associated with autosomal recessive CSNB. Bidirectional sequencing of GRM6 identified homozygous single base pair changes, specifically c.1336C>T (p.R446X) and c.2267G>A (p.G756D) in families PKRP170 and PKRP172, respectively. Conclusions: We identified a novel nonsense and a previously reported missense mutation in GRM6 that were responsible for autosomal recessive CSNB in patients of Pakistani decent.

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